正確にはiPhone 4のiOS 4.2.1 (8C148) で試しましたが、以下のコードを実行して全クラスの名前をコンソールに表示してみました。

extern int objc_getClassList(Class*, int);
extern Class class_getSuperclass(Class cls);
extern const char * class_getName(Class cls);

@implementation DumpClassesViewController

- (void)viewDidLoad
{
	[super viewDidLoad];
	
	int numClasses = objc_getClassList(nil, 0);
	Class *classes = nil;
	
	classes = (Class*)malloc(sizeof(Class) * numClasses);
	numClasses = objc_getClassList(classes, numClasses);
	
	printf("Number of Classes:%d\n", numClasses);
	
	for(int i = 0; i < numClasses; i++)
	{
		Class c = classes[i];
		printf("%s ", class_getName(c));
	}
	
	free(classes);
}

@end

その結果はクラス数 1,422 1,420個でした。実際のダンプ結果をドド〜ンとどうぞ。スペース区切りです。

【追記】このダンプには自分自身（DumpClassesViewControllerとDumpClassesAppDelegate）も含まれているので、iOSのクラスとしては1,420個です。ご指摘ありがとうございました、@sumihiro さん。

Number of Classes:1422
NSURLQueueNode CPLRUDictionary UIBezierPath UIButtonContent UIInputViewTransition NSPathStore2 WebInspector NSRunLoop UIScrollAnimation UnchargedButton _UILabeledPushButton DOMCSSVariablesDeclaration NSKeyValueFastMutableArray1 DOMHTMLModElement __NSAutoBlock UIDragger UIKBKeyInterval NSURLDirectoryEnumerator NSPhoneNumberCheckingResult DOMCSSValueList UIAutocorrectStringView UIWebSelectionAssistant __NSOperationInternal CFXPreferencesCompatibilitySource UIAlphaAnimation UIKeyboardEmojiFactory UIAlertTextView WebInspectorWindowController NSKeyValueFastMutableArray2 PEPServiceConfiguration __NSMallocBlock UIFlicker UITableViewCellLayoutManagerValue1 NSFileManager NSTransitInformationCheckingResult UIKeyboardLayout UIWebSelectionOutline DOMValidityState NSMessagePortNameServer UIInternalEvent UIKBKeyset NSKeyValueSlowMutableArray DOMUIEvent UI9PartImageView UITableViewCellLayoutManagerValue2 NSFileHandle NSOrthography DOMHTMLMetaElement UIDefaultKeyboardInput UIWebSelectionHandle NSUndoManagerProxy ALCityManager UIEvent UIKBKeyboard NSURLQueue NSData UIImage CAWindowServer UITextInputTraits UIInputViewAnimationStyle DOMCSSValue NSNullFileHandle NSComplexOrthography DOMHTMLMenuElement UIGradientBar UIWebSelectionView NSUndoManager DOMCSSUnknownRule UITouch UIKBKeyCacheEntry NSURLFileTypeMappingsInternal NSTimer _UIStretchableImage UITableHeaderFooterView UIPeripheralHostView NSOperation WebKitStatistics CPLRUDictionaryNode __NSFinalizingBlock UIFrameAnimation UIKeyboardEmoji UIRuntimeOutletCollectionConnection NSMessagePort DOMCSSStyleSheet UISectionList UIKeyboardLayoutEmoji_iPad UIThreePartImageView DOMTreeWalker NSKeyValueNotifyingMutableSet UIDelayedAction UIKeyboardLayoutStar _UIPopoverLayoutInfo NSFileAttributes NSSimpleRegularExpressionCheckingResult CFXPreferencesPropertyListSource UIAutocorrectTextView UIMenuItem _NSPredicateUtilities InvocationTrampoline DOMHTMLMarqueeElement NSBlock UIKeyboardPartialLayoutView UIKBKeylistReference NSKeyValueMutableArray ThreadedInvocationTrampoline UIGestureInfo UIKBKeyplaneView UIKeyboardCache NSDirectoryEnumerator NSExtendedRegularExpressionCheckingResult CFXPreferencesSearchListSource CAScrollLayer UIAutocorrectShadowView UIMenuController _NSNestedDictionary WebCoreScrollView DOMHTMLMapElement NSCache UIRemoteControlEvent UIKBKeylayout NSProtocolChecker DOMCSSStyleRule UIApplication UIGlassButton UIKeyboardAutomatic DOMTouchList NSAllDescendantPathsEnumerator NSComplexRegularExpressionCheckingResult __NSStackBlock UIAutocorrectImageView UIWebLongPressInSelectableRecognizer NSPortNameServer DOMTouchEvent UITouchesEvent UIKBKeylist NSConcreteProtocolChecker _UIBackgroundTaskInfo UIRoundedRectButton UIInputViewRotateTransition NSConcretePointerFunctions WebIconFetcher UISectionHeaderCell UIKeyboardLayoutEmoji_iPhone _UIAlertOverlayWindow NSMachBootstrapServer WebImageRendererFactory UIMotionEvent UIKBGeometry NSURLHostNameAddressInfo DOMHTMLLinkElement UIUndoAlertView UIButtonLabel UIInputViewSlideTransition NSPointerFunctions CPSearchMatcher UIRotationAnimation UIKeyboardLayoutEmoji _UIMediaPushButton NSKeyValueFastMutableArray CFXPreferencesManagedSource UIGestureAnimation UIKeyboardTouchInfo DOMCSSStyleDeclaration NSAssertionHandler NSConcreteAttributedString DOMHTMLLIElement __NSTimeZone CASpring UITableViewCellLayoutManager _UIToolbarAppearance UIPrintRangePickerView _NSUndoLightInvocation UIKeyboard UITextMagnifierRanged WebHTMLRepresentationPrivate DOMTouch NSDecimalNumberPlaceholder WebHTMLRepresentation OperationQueueInvocationTrampoline UIKeyboardSublayoutEMail UITextTapRecognizer DOMCSSRuleList NSOperationQueue DOMTextEvent _UIOnePartImageView UIDatePicker UIInputSwitcherSelectionExtraView _NSUndoInvocation UIClippedImageView UITextMagnifierRangedRenderer NSDecimalNumber ABVCardValueSetter UIKeyboardSublayout UIKBAttributeList NSAutoContentAccessingProxy DOMText _UIPickerViewTopFrame UIButton UIInputSwitcherShadowView NSKeyValueNonmutatingCollectionMethodSet CapturedInvocationTrampoline DOMHTMLLegendElement NSInputStream CADisplayMode UITextFieldLabel UIWebClipIcon _UIAlertSheetTable NSDecimalNumberHandler ABVCardPersonValueSetter UIKeyboardReplacementImageView UIKBKey NSWeakCallback DelayedInvocationTrampoline __NSCFConstantString UIWeekMonthDayTableCell UIPopoverButton UIInputSwitcherTableCellBackgroundView DOMCSSRule NSKeyValueMutatingCollectionMethodSet DOMHTMLLabelElement NSTimeZone UIFloatArray UIInlineCandidateTextView UIAlertSheetTextField WebHTMLView NSMutableAttributedString NSError DOMCSSPrimitiveValue UITouchDiagnosticsLayer UITableViewCellReorderControl UIKeyboardInputMode NSNotificationQueue NSOutputStream UIDateTableCell UITexturedButton UIKeyboardRotationState NSKeyValueNonmutatingArrayMethodSet __NSPlaceholderTimeZone CAForceField UISectionTable InlineCandidateCell UIOnePartImageView NSCFError NSConcreteMutableAttributedString DOMCSSPageRule UITextView UITableViewCellEditingData UIKeyboardInputModeController DOMStyleSheetList _NSUndoStack ABVCardCardDAVValueSetter UIAutocorrectInlinePrompt UITextContentView WebHTMLViewPrivate _NSUndoObject NSMutableData UIAutoscroll UITextMagnifierTimeWeightedPoint NSURLFileTypeMappings DOMHTMLIsIndexElement __NSBlockVariable CADisplay UIKeyboardLayoutQWERTYK48 UIPopoverViewBackgroundComponentView NSBlockOperation WebGeolocationManager UIPickerScrollAnimation UISwitch UITextCheckerDictionaryEntry NSKeyValueIvarMutableArray UITextField UIActivityIndicatorView _UIAlertStackWatcher NSURLKeyValuePair AggregateDictionary ABVCardParser DOMHTMLInputElement __NSGlobalBlock CAWindowServerDisplay UIKeyboardLayoutQWERTY UIKeyboardSwipeGesture NSInvocationOperation DOMCSSMediaRule _UIPickerWheelView _UISwitchInfo UIStatusBarThermalColorItemView DOMStyleSheet NSKeyValueNotifyingMutableArray CPNetworkObserver UITextFieldAtomBackgroundView UIAutoRotatingWindow _UIAlertTableViewCell WebHistoryPrivate NSConcreteFileHandle NSSimpleOrthography UIStatusBarCorners UISwappableImageView UITableViewCellDeleteConfirmationControl __NSOperationQueueInternal CPAggregateDictionary DOMCSSImportRule _UIPickerViewSelectionBar UIDatePickerView UIInputSwitcherView DOMStyleMedia NSKeyValueContainerClass UITextFieldBorderView UITextEffectsWindow UIAlertSheetTableCell NSPipe NSKeyValueChangeDictionary AppleSpell NSStream CADisplayLink _UISwappableImageViewAnimationProxy _UITableViewCellDeleteConfirmationControl UIPrintRangeViewController _NSUndoBeginMark ABVCardCardDAVParser DOMHTMLImageElement NSLocale UICheckeredPatternView UITextMagnifierCaret WebHistoryItem NSKeyValueArray UITextFieldCenteredLabel UIWebClip _UIAlertBackgroundView NSAttributedString NSConcretePipe _ReachabilityRequest CoreMotionManager NSUserDefaults UISelectionIndicatorView UITableViewLabel UIPrintRangePickerLayoutView _NSUndoEndMark ABVCardParameter DOMHTMLIFrameElement NSURL UIKeyboardImpl UITextMagnifierCaretRenderer NSPortMessage DOMCSSFontFaceRule UIKeyboardLayoutRoman UIGestureContext DOMRGBColor NSExpression DOMGestureEvent __NSArrayI LKNSArrayCodingProxy UITabBarController UITableViewVisibleCells UIConcreteMarkupTextPrintFormatter WebPolicyDecisionListenerPrivate NSNetworkSettingsInternal UISliderContent UIGestureDelayedTouch WebGeolocationPolicyListener NSCFSet UIPickerTableCell UISwipeGestureRecognizer NSKeyValueShareableObservanceKey DOMHTMLTableCaptionElement UIStatusBarItem UIWebViewInternal NSNetworkSettings UIPreferencesTextTableCell UIGestureRecognizerTarget NSCountedSet UIPreferencesDeleteTableCell UIPhraseBoundaryGestureRecognizer WebPolicyDecisionListener NSKeyValueObservance DOMHTMLStyleElement UIScroller UIStatusBarItemView NSConcreteHashTable NSDateCheckingResult UIProxyObject CACodingProxy UIScrollViewScrollAnimation _UIOpenInNavigationController WebCoreMediaPlayerNotificationHelper NSScanner WebCoreStatistics UIAccentedCharacterView UIRuntimeAccessibilityConfiguration DOMFileList NSKeyValueObservationInfo UIStatusBarLayoutManager UIScrollerIndicator NSClassicHashTable NSAddressCheckingResult DOMFile __NSPlaceholderArray UIRuntimeConnection UINavigationBarBackground _UIOpenInTableViewController WebCoreBundleFinder NSConstantValueExpression UIMoreNavigationController UITableViewCellContentMirror UIMarkupTextPrintFormatter NSKeyValueNilSetEnumerator UIScrollerScrollAnimation UIStatusBarPublisher NSDirectoryTraversalOperation NSLinkCheckingResult DOMHTMLSelectElement __NSArrayM UIClassSwapper LKNSDictionaryCodingProxy UINavBarPrompt UIKeyboardCandidateBar NSAnyKeyExpression UIMoreListCellLayoutManager UIViewAnimationContext UIViewPrintFormatter WebPreferences NSHTTPCookieStorageInternal UICoverFlowLayer UIPinchGestureRecognizer WebDatabaseManager NSURLCache DOMHTMLScriptElement ProfilerServer UIPreferencesTableCell ABHelper NSCFOutputStream __NSDate CATransition UISearchFieldBackgroundView UIWebDragDotView WebAnimationDelegate NSKeyValueNestedProperty WebPluginContainerCheck UIStatusBarBackgroundView UIWebPaginationInfo DOMEvent _NSIndexPathUniqueTree NSTextCheckingResult UIView UIKeyboardCandidateShadowView UIRoundedCornerView NSSortDescriptor WebBasePluginPackage DOMEntityReference __NSCFDictionary CAMatchMoveAnimation UITextFieldBackgroundView UIWebTextRangeView DOMXPathResult NSKeyValueComputedProperty UIStatusBarForegroundView UIWebViewWebViewDelegate NSIndexPath NSOrthographyCheckingResult UIViewHeartbeat KBCandidateCell UIClipCornerView NSKeyPathSpecifierExpression WebPluginController DOMHTMLQuoteElement WTFMainThreadCaller UIViewControllerAction UIKeyboardEmojiCategoriesControl_iPad UIPrintFormatter NSKeyValueShareableObservationInfoKey WebPluginDatabase UIStatusBarIndicatorItemView UIWebView NSHost NSSpellCheckingResult WebCache UIViewAnimationState UINib UIDocumentInteractionController NSKeyPathExpression DOMHTMLPreElement CAAnimationGroup UINavigationController UIKeyboardEmojiCategoriesControl_iPhone UIConcreteSimpleTextPrintFormatter NSURLAuthenticationChallengeInternal DOMEntity NSDate UIPreferencesTableCellRemoveControl UIWebFormDelegate DOMXPathExpression __NSStackBlock__ NSHashTable NSGrammarCheckingResult UINibStorage UIScrollView _UIPreviewItemProxy WebOpenPanelResultListener NSFunctionExpression WebPluginPackage UISnapshotModalViewController UIKeyboardEmojiCategoriesControl UISimpleTextPrintFormatter NSURLAuthenticationChallenge DOMElement __NSPlaceholderDate UISlider UIGestureRecognizer DOMNativeXPathNSResolver NSSimpleCString UISystemAlertRequest UIMultiColumnsNavigationTransitionView NSKeyValueFastMutableSet2 WebApplicationCache DOMWheelEvent UIRemoteApplication UISelectionTapRecognizer NSFilesystemItemRemoveOperation NSReplacementCheckingResult DOMHTMLParamElement UIWebLayer UIPageController NSFalsePredicate CACGPathCodingSegment UIFingerInfo UIKeyboardCandidateInlineScroller UIInputViewPostPinningReloadState NSCFURLProtocol WebMainThreadInvoker __NSCFArray UIFieldEditor UIKeyboardEmojiScrollView UIKeyboardEmojiGraphics NSFilesystemItemMoveOperation NSCorrectionCheckingResult WebPDFView DOMHTMLParagraphElement WebThreadSafeUndoManager UIPageControllerScrollView NSCompoundPredicate UIViewTapInfo UIKeyboardCandidateInline UIPeripheralHostState NSAboutURLProtocol CPBitmapStore NSMutableArray UIViewController EmojiPageControl UIPrintInfoRequest DOMImplementation NSCFType DOMWebKitTransitionEvent UIGroupInsertionItem AddressBookMatch WebArchivePrivate NSComparisonPredicate DOMDocumentType CFXPreferencesSource UIScreenMode UIViewAnimationBlockDelegate CARenderObject UIKeyboardCandidateInlineTextLabelView WebArchive NSNumberFormatter WebPlainWhiteView UIFullScreenViewController EmojiScrollView UIPrintInfo NSPort DOMWebKitCSSTransformValue _UIGroupItem FormAutoFiller NSKeyValueSlowMutableSet UIPasscodeField UIWebSelectionGraph NSFormatter UIViewControllerWrapperView UIKeyboardEmojiView UIPrintPaper DOMHTMLOptionsCollection NSMachPort _UIPrefTableCellPiece UIWebFormCompletionController WebBackForwardList NSKeyValueIvarMutableSet DOMHTMLOptionElement DumpClassesViewController UITextFieldRoundedRectBackgroundView UIWebSelectionNode _NSFileManagerInfo NSRegularExpressionCheckingResult DOMDocumentFragment CACGPathCodingProxy UIDefaultWebViewInteractionDelegate UITableViewCellContentView NSDirectorySubpathsOperation NSSubstitutionCheckingResult WebMarkup UITouchTapInfo UIKBKeyplane NSAggregateExpression CPPowerAssertionManager UITextRenderingAttributes UITableHeaderFooterViewLabel UIPeripheralHostLayer NSHTTPCookieStorage DOMDocument UITransformAnimation UIKeyboardEmojiCategoryController UIPlacardButton DOMWebKitCSSMatrix NSConcreteScanner DumpClassesAppDelegate LKCGColorCodingProxy UIInformalDelegate UITableViewCellLayoutManagerSubtitle NSTruePredicate DOMWebKitCSSKeyframesRule UIWindow UITableViewIndex UIInputViewSet NSHTTPCookie WebNavigationDataPrivate DOMHTMLOptGroupElement UIAnimation UIKeyboardEmojiCategory UIFenceController NSProxy LKNSValueCodingProxy UIWebPlugInView UIThreadSafeNode NSKeyValueMutableSet __NSArrayReverseEnumerator UIITunesStoreURLResolver UIWebSelection _NSCFURLProtocolBridge DOMHTMLOListElement UIAnimator UIKeyboardEmojiPage UITextSelection NSPropertyListSerialization DOMCSSVariablesRule NSArray CACGPatternCodingProxy UIPreferencesTable UIWebFormABCompatibility NSKeyValueFastMutableSet UIGameCenterURLResolver UITextMagnifierRenderer NSFilesystemItemCopyOperation NSQuoteCheckingResult RadiosPreferences DOMWebKitCSSKeyframeRule UIWebDocumentView UIKeyboardMinimizedView NSProcessInfo ALCity __NSArrayReversed LKCGImageCodingProxy UIGroupDeletionItem FormToABBinder NSKeyValueFastMutableSet1 UIURLResolver UIVariableDelayLoupeGesture NSFilesystemItemLinkOperation NSDashCheckingResult WebNavigationData DOMWebKitAnimationEvent WebViewReachabilityObserver UIKeyboardZoomGesture NSPredicate DOMHTMLObjectElement UITouchData UIKeyboardCandidateSafetyNetVie UIPeripheralHost NSKeyValueSlowMutableCollectionGetter NSAKSerializer CTMessageStatus DOMMouseEvent UIScrubberControl UISearchDisplayController NSCFBoolean NSCompoundPredicateOperator DOMHTMLDListElement UICachedDevicePatternColor UITableViewScrollTestParameters NSURLProtectionSpace SBSLocalNotificationClient UIScreen UIStatusBar NSPlaceholderNumber WebDefaultUIKitDelegate Protocol CAGradientLayer UIImageAndTextTableCell UITabBarItemProxy UISnapshotView LSApplicationWorkspace AccessibilityTextMarker NSDebugString NSComparisonPredicateOperator WebDownloadInternal DOMHTMLDivElement Object UICachedDeviceRGBColor UIKeyboardCandidateSingle WAKView NSURLCredentialStorage CTMessagePart AccessibilityObjectWrapper UIPageControl UIRotationGestureRecognizer NSCFTimer CALayer _UITableCellGrabber UITabBarButton UISharedImageStatisticsTable LSDocumentProxy NSAutoLocale WebTextIterator NSInvocation SBSCompassAssertion UIThreePartButton UIMovieScrubberTrackOverlayView UIPrintStatusViewController NSURLCredential UITableViewRowData UIDropShadowView DOMMessagePort _NSCallStackArray WebDownload NSEnumerator CAContext UITableCellFlashDeselectAnimation UITabBarButtonLabel UISharedImageStatistics NSKeyedArchiver DOMMessageEvent UIRemoveControl UIMovieScrubberTrackFillView UIPrintStatusTableViewController WebTextIteratorPrivate NSKeyValueIvarMutableCollectionGetter NSAKDeserializer CTEmailAddress DOMHTMLDirectoryElement UIScrubberTimeView UISearchResultsTableView WAKScrollView __NSFinalizingBlock__ _NSThreadPerformInfo NSException CAFilter UITableCellFadeAnimation UITabBarButtonBadge UILocalNotification WebEditCommand _NSKeyedUnarchiverHelper WAKResponder UIRemoveControlTextButton UIMovieScrubberTrackInnerShadowView UIPrintStatusTableViewCell NSKeyValueNotifyingMutableCollectionGetter NSPageData UIInsertControl UILocalizedIndexedCollation NSBundle NSBetweenPredicateOperator UICachedDeviceWhiteColor UIKeyboardCandidate _WebSafeForwarder NSAutoCalendar NSInPredicateOperator WebDefaultPolicyDelegate WAKClipView NSNull UIFont CALayerHost UITextRange LSResourceProxy NSHTTPURLRequestParameters CTTelephonyNetworkInfo UIAccelerometer UIScrollViewPanGestureRecognizer NSValue UITableView UITabBar UIWebTextView DOMMediaList NSLock UIProgressBar _UITableViewUpdateSupport UIPrintPanelButtonLayoutView DOMHTMLCollection NSURLProtocolInternal WebSelectionRect DOMKeyboardEvent UIAcceleration UIScrollViewPagingSwipeGestureRecognizer NSNumber WebDefaultResourceLoadDelegate ABCCallbackInvoker DOMHTMLCanvasElement UITableColumn UITabBarCustomizeViewLegacy UIStatusBarLockItemView NSConditionLock CTCarrier UISegmentedControl UIKeyboardEmojiRecentsController UIStepper NSKeyValueUndefinedSetter NSLeafProxy NSCursor CAMediaTimingFunctionBuiltin _UIDateLabelCache UITapRecognizer LSOpenOperation NSPlaceholderValue DOMHTMLButtonElement SBSRemoteNotificationClient UIHardware UITabBarCustomizeView UIKBIdentifierList NSRecursiveLock WebSerializedJSValue UISegmentLabel UIDimmingView UIPrintInteractionController NSKeyValueFastMutableCollection1Getter NSAKSerializerStream NSMessageBuilder UIProgressHUD UITableViewCellLayoutManagerEditable1 NSEqualityPredicateOperator DOMHTMLUListElement UIColor UITextPosition __NSGlobalBlock__ NSMultiReadUniWriteLock CTCallCenter UISegment UIMovieScrubberThumbnailView UIPrintInteractionControllerInternals WebSerializedJSValuePrivate NSKeyValueFastMutableCollection2Getter NSAKDeserializerStream SBSAccelerometer NSMethodSignature CALayerArray UISearchField UIWebURLAction LSApplicationProxy NSCFNumber NSCustomPredicateOperator WebDefaultUIDelegate DOMHTMLTitleElement UIPlaceholderColor UITextInputArrowKeyHistory NSURLProtocol DOMHTMLBRElement UIDevice UIScrollViewDelayedTouchesBeganGestureRecognizer WebThreadCaller NSPlaceholderString UIStatusBarSignalStrengthItemView UITableSeparatorView NSKeyValueProxyShareKey WebDefaultEditingDelegate UICustomObject UINavigationBar UIWebBrowserView NSMutableIndexSet NSDataDetector DOMHTMLBodyElement NSDictionary EAGLSharegroup _UIImageViewExtendedStorage _UITableViewSeparatorView UIPrinterSearchingView WebScriptCallFramePrivate TileLayer NSUnarchiver NSSymbolicExpression UIWebTiledView UICompositeImageElement NSKeyValueProperty UINavigationItem UIBarItem UIWebBrowserPDFPageLabel NSCFAttributedString _NSIndexSetEnumerator DOMHTMLTextAreaElement __NSDictionaryObjectEnumerator CAPropertyAnimation UIProgressIndicator _UITableViewDeleteAnimationSupport UIPrinterTableViewCell NSAffineTransform NSSubqueryExpression UITextLabel UIGroupTableViewCellBackground NSCachedURLResponse UIKeyboardSpaceKeyView UITextInputStringTokenizer WebScriptCallFrame NSDateFormatter _NSIndexPathUniqueTreeNode DOMHTMLTableSectionElement UIResponder _UITableViewReorderingSupport UIPrintPanelTableViewController WebScriptWorld NSSetExpression CTMessage DOMHTMLBaseFontElement EAGLContext UILabel _UIGroupTableViewCellBackgroundImageKey TileHostLayer NSURLCacheInternal WebDefaultFormDelegate UIKeyboardKeyView UITextPositionImpl __NSLocalizedString UIStatusBarDataNetworkItemView CAKeyframeAnimation _UITableDeleteAnimationSupport __NSMallocBlock__ NSSelfExpression DOMHTMLBaseElement UIDateLabel UITapGestureRecognizer WebCorePowerNotifierIPhone NSURLCacheNode UICFFont UITextRangeImpl WebScriptWorldPrivate NSCFInputStream CABasicAnimation _UITableReorderingSupport UIScrollViewPinchGestureRecognizer NSKeyValueUnnestedProperty WebDefaultFrameLoadDelegate DOMHTMLTableRowElement NSMutableDictionary _UINavigationBarAppearance UITabBarItem UIWebTouchEventsGestureRecognizer NSKeyedUnarchiver UINavigationItemButtonView UIRuntimeEventConnection UIKeyboardCandidateBarCell WebDatabasePauser NSKeyValueSlowGetter NSFileWrapperMoreIVars UIMoreListController UIViewAnimation UIWebViewPrintFormatter NSAutoreleasePool NSVariableExpression DOMHTMLTableElement CAContextImpl UIPreferencesControlTableCell UITextInteractionAssistant NSURLError DOMHTMLAreaElement __NSDictionary0 UINibDecoder UIAccentedKeyCapStringView WebPreferencesPrivate WebCoreSharedBufferData NSKeyValueSlowSetter NSFileWrapper CTPhoneNumber UISectionIndex UIUpdateItem UIPrintPanelViewController NSCFArray NSVariableAssignmentExpression UIShadowView UILongPressGestureRecognizer NSURLConnectionInternal DOMHTMLAppletElement __NSFastEnumerationEnumerator UINibStringIDTable UIKeyboardLanguageIndicator WebCoreSynchronousLoader _NSThreadData NSCFString UIStatusBarServer UIContinuation NSArchiver NSTernaryExpression __NSPlaceholderDictionary CAAnimation UICompositeImageView UIWebFormPasswordsEditor NSURLConnection DOMHTMLTableColElement UIKeyboardGenericKeyView UIVideoEditorController NSThread WebResourcePrivate CTMmsEncoder UITable UIStatusBarServerThread _NSKeyedCoderOldStyleArray WebDataSourcePrivate UIRuntimeOutletConnection UINavigationItemView UIInputSwitcher __NSAutoBlock__ NSCachedURLResponseInternal WebDataSource DOMHTMLTableCellElement UIKeyboardReturnKeyView UITextInputMode NSString DOMHTMLAnchorElement UIStatusBarWindow UITableCountView WebCoreResourceHandleAsDelegate NSKeyValueSet UINavigationButton UIImageNibPlaceholder UIWebFormAccessory NSIndexSet NSRegularExpression WebResource CTMessageCenter NSURLConnectionIPhone UIImageView CASlotProxy UITableViewCountView UIPrinterBrowserViewController NSNotificationCenter WebGeolocationMock WebGLLayer UIKeyboardLayoutAZERTYLandscape UIKBCandidateView NSKeyValueAccessor CPDistributedMessagingCenter UIPickerView UIOldSliderFillView UIPopoverController NSPurgeableData NSSimpleAttributeDictionary ADDataStore DOMCSSCharsetRule __NSCFError CAValueFunction UIAlertView UIControlTargetAction _UISearchBarAppearance DOMRect NSURLDownload WebUserContentURLPattern ABVCardCardDAVExporter __NSSet0 UIToolbarTextButton UIRemoteWindow UIPrintingProgressViewController NSKeyValueGetter UIPickerTable UILayoutContainerView UIClientRotationContext NSSubrangeData NSSimpleAttributeDictionaryEnumerator WebGeolocationPosition DOMHTMLHtmlElement __NSCFBoolean UIGradient UIBarButtonItem _UIAlerts_Support NSURLConnectionDelegateProxy ABVCardRecord NSDateComponents UIToolbarButton UIKBShape UIPrintingMessageView WebUserContentURLPatternPrivate NSValueTransformer ADCrashLogStore UIDOMHTMLOptGroupSelectedItem UICalloutBarOverlay NSCFData NSBlockPredicate DOMHTMLHRElement __NSPlaceholderSet CATransaction UIPushButton UIProgressView _UIAlertManager WebGeolocationPositionInternal GeolocationCoreLocationDelegate NSGZipDecoder ADKeyStore WebGeolocationManagerPrivate UIToolbarButtonBadge UITableViewCellEditControl UIPrintPageRenderer DOMRange _NSSharedValueTransformer WebTiledLayer UIDOMHTMLOptionSelectedItem UITapAndAHalfRecognizer PersistentURLTranslatorAccess DOMCounter NSMutableString CPDistributedMessagingCallout DOMProgressEvent UIKeyboardLayoutAZERTY UIKBKeyView NSURLResponseInternal CPDistributedMessagingDelayedReplyContext DOMComment UIButtonBarBadgeBackground _UITableViewCellEditControlMinusView UITextViewPrintFormatter _NSNegateBooleanTransformer ABPersonLinker UIHighlightView UIDragRecognizer WebHistory NSCheapMutableString DOMProcessingInstruction UIKeyboardLayoutQWERTYLandscapeK48 UIPopoverView NSKeyValueProxyGetter DOMHTMLHeadingElement __NSCFCharacterSet CATransformLayer _UIPickerViewWrappingTableCell UIImagePickerController UITextChecker NSKeyValueMutatingArrayMethodSet WebSecurityOrigin _CPPowerAssertionThread UIStatusBarBluetoothItemView _UIOldSliderAnimation NSCFDictionary NSMutableStringProxyForMutableAttributedString WebFrameViewPrivate UIControl UISearchBarBackground UIActionSheet NSNetService ABVCardLexer DOMHTMLHeadElement UIToolbarCustomizeViewLegacy UINavigationTransitionView UIKeyboardOverlayManager WebScriptObjectPrivate NSTask DOMCharacterData __NSCFAttributedString CADynamicsBehavior UIWebSelectPicker UISelectionGrabber NSConcreteData NSRLEArray WebUndefined UIDelayedControlTargetAction UISearchBarTextField _UIActionSheetHostingController NSNetServiceBrowser WebDatabaseQuotaManager _CPPowerAssertion DOMPageTransitionEvent UIToolbarCustomizeView UIRemoteSheetInfo UIStatusBarNotChargingItemView NSConcreteTask DOMCDATASection __NSCFString CABehavior UIWebSelectPeripheral UISelectionGrabberDot NSNotification __NSLocalTimeZone UIClassicController UIKeyboardLayoutQZERTY NSURLDownloadInternal DOMOverflowEvent __NSCFNumber UIBarButtonItemProxy UIRemoteView UIPrintingProgress _NSXMLParserInfo ABVCardExporter DOMHTMLFrameSetElement __NSCFCalendar CAEAGLLayer UIDOMHTMLOptGroupCell UICalloutBar NSConcreteNotification WebFrameView CPDistributedMessagingAsyncOperation UIKeyboardLayoutQWERTZLandscape UIKBHandwritingStrokes NSKeyValueNonmutatingSetMethodSet UIOldSliderControl UIStatusBarBluetoothBatteryItemView NSXMLParser ABVCardCardDAVRecord DOMHTMLFrameElement NSCalendar CARenderer UIDOMHTMLOptionPickerCell UICalloutBarButton WebScriptObject __NSObserver UIKeyboardLayoutQWERTZ UIKBHandwritingView NSKeyValueMutatingSetMethodSet WebApplicationCacheQuotaManager WebLayer UIOldSliderButton UIStatusBarActivityItemView DOMBlob NSConcreteMutableData NSMutableRLEArray WebGeolocation DOMObject CPDistributedNotificationCenter UIDeprecatedDelayedControlTargetAction UISearchBar UITwoSidedAlertController NSURLRequestInternal DOMBeforeLoadEvent __NSCFLocale PKPrinter UITableCellDisclosureView _UITabBarAppearance UIStatusBarHideAnimationParameters WebFramePrivate _NSKeyedUnarchiveFromDataTransformer WebViewFactory ABValuePredicate _NSZombie_ CAReplicatorLayer UIRemoveControlTextFrameAnimation UIMovieScrubberEditingView UIWebDocumentViewPrintFormatter NSConcreteMapTableValueEnumerator DOMNotation UICalloutView UIWindowController NSKeyValueIvarGetter NSDocInfo _CPBundleIdentifierString DOMHTMLFormElement UIKeyboardLayoutRomajiLandscape UIClassicStatusBarImageView NSConcreteValue CPExclusiveLock ABPredicate NSObject CAShapeLayer UIToolbar UIKeyboardInputManager UIPrintStatusJobsViewController NSClassicMapTable WebFontCache PKPrinterBrowser UIWebSelectPopover UITextSelectionView WebFrame NSKeyValueUndefinedGetter NSDocumentSerializer DOMHTMLFontElement UIKeyboardLayoutRomaji UIZoomViewController NSCFCharacterSet NSPredicateOperator CTCall DOMAttr UIStatusBarBatteryItemView _UITableViewCellGrabber NSCondition WebEventRegion UIWebSelectTableViewController UITextRangeView NSKeyValueMethodSetter NSDirInfoSerializer UIKeyboardLayoutQWERTYLandscape UIStatusBarAdornmentWindow _NSPlaceholderCharacterSet NSMatchingPredicateOperator WebVisiblePosition CAMediaTimingFunction UIStatusBarBatteryPercentItemView PKJob _UITableViewCellOldEditingData DOMNodeList NSURLRequest ABNamePredicate __NSGenericDeallocHandler _UITableCellTransientData UITableViewController UIStatusBarAnimationParameters __NSBlockVariable__ NSKeyValueIvarSetter NSDirInfoDeserializer UIKeyboardLayoutQZERTYLandscape UIStatusBarViewController NSCalendarDate NSLikePredicateOperator DOMHTMLFieldSetElement UITableViewCellUnhighlightedState UIStatusBarAirplaneModeItemView NSMutableURLRequest CPRegularExpression ABGroupMembershipPredicate __NSCFType UITransitionView UITableViewControllerKeyboardSupport UIModalView WebFramePolicyListener NSWeakPointerValue WebWorkersPrivate WebEvent PKPrintSettings UIButtonBarCustomizeView UIPasteboard UIPrintStatusJobTableViewCell DOMAbstractView _NSIsNilTransformer ABSearchOperation DOMHTMLEmbedElement UIRemoveControlMultiSelectButton UIMovieScrubberTrackView UITextReplacement WebView NSPlaceholderMutableString __NSCFTimer UICompletionTable UIAccessibilityElement WebEditorUndoTarget DOMNodeIterator NSKeyValueSetter NSRTFD WebCoreViewFactory NSMutableSet UIDeviceRGBColor UISplitViewController DOMNodeFilter NSConstantString NSBlockExpression PKPaper UISectionRowData _UIBookViewControllerView NSMapTable __NSCFData UICompletionTablePrivate UIPanGestureRecognizer DOMNode NSKeyValueMethodGetter NSDocumentDeserializer NSSet UIDeviceWhiteColor CATransactionCompletionItem UIZoomButtonWindow NSCoder _NSPredicateOperatorUtilities UITableViewCell UIBookViewController NSURLResponse ABAnyValuePredicate DOMHTMLElement UITableCellRemoveControl UITabBarBadgeBackground UIConcreteLocalNotification NSKeyValueCollectionGetter NSDirInfo WebElementDictionary UICGColor UIClassicWindow NSCharacterSet NSSubstringPredicateOperator WebCoreKeyGenerator UIStatusBarTimeItemView UITableViewCellSelectedBackground WKQuadObject NSHTTPURLResponseInternal ABPhonePredicate DOMHTMLDocument UISimpleTableCell UITabBarSwappableImageView UIStatusBarOrientationAnimationParameters _NSIsNotNilTransformer WebProgressItem __NSCFOutputStream CATextLayer UIRemoveControlMinusButton UIMovieScrubberTrackMaskView UIAutocorrectionRecord DOMNamedNodeMap NSMutableCharacterSet NSStringPredicateOperator WAKWindow UIStatusBarServiceItemView _UITableViewCellRemoveControl WebCoreAuthenticationClientAsChallengeSender NSHTTPURLResponse WebFormDelegate DOMMutationEvent UITableCell UITabBarSelectionIndicatorView UIStatusBarStyleAnimationParameters _NSUnarchiveFromDataTransformer __NSCFInputStream CATiledLayer DNSServiceRefWrapper WhiteView UIMovieScrubber UIStatusBarRecordingAppItemView WebViewPrivate NSConcreteMapTable __NSCFSet UICompletionTableViewCell UIPanGestureVelocitySample

Mirrorscopeみたいな処理はiOS 4.0以降のAVCaptureナンチャラを使うんだけど、開発中に困惑したのがビデオ入力の画像解像度などを決めるプリセットの挙動。デバイスの差異を吸収するためにプリセットとして抽象化されてると勝手に思ってたら大間違い。なかなか一貫性がないので表にまとめました。初代iPhoneはiOS 4.0が対応していないので省いています。

結論的には、どのデバイスでも同一の解像度が得られるプリセットはないし、解像度の大小関係も一意的に決められませんね。特に3Gが鬼門になっています。Mirrorscopeではがんばって全デバイスに対応してますけど、なんか理不尽な感じが拭えません（笑）。

それに、これまた抽象化の都合のいいところで、次のアップデートでは数値が変わっちゃうかもしれないですね。せめてプリセットに対して解像度を返してくれるメソッドがあるといいんですけどね（ないよね？＞誰となく…）。