iOS7只返回’NSInvalidArgumentException’，原因：’ – ：
我正在使用一个书籍应用程序，用户可以点击一个单词，然后一个音频文件的一部分将播放包含该单词的单词，并且该单词将被突出显示。 不幸的是，我现在遇到一些错误，我试图优化代码，从仅iOS8到支持iOS7。
这是我得到的错误：
2015-06-10 10:42:50.455 Chi Shin får en hund[63976:607] selected :sammen -- (28B) 2015-06-10 10:42:50.456 Chi Shin får en hund[63976:607] -[__NSCFString containsString:]: unrecognized selector sent to instance 0x78f585a0 2015-06-10 10:42:50.458 Chi Shin får en hund[63976:607] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString containsString:]: unrecognized selector sent to instance 0x78f585a0' *** First throw call stack: ( 0 CoreFoundation 0x023371e4 __exceptionPreprocess + 180 1 libobjc.A.dylib 0x020b68e5 objc_exception_throw + 44 2 CoreFoundation 0x023d4243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275 3 CoreFoundation 0x0232750b ___forwarding___ + 1019 4 CoreFoundation 0x023270ee _CF_forwarding_prep_0 + 14 5 Chi Shin faÃär en hund 0x000ab695 -[DataViewController pageWordTapped:] + 805 6 UIKit 0x015384f4 _UIGestureRecognizerSendActions + 230 7 UIKit 0x01537168 -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 383 8 UIKit 0x01538bdd -[UIGestureRecognizer _delayedUpdateGesture] + 60 9 UIKit 0x0153c13d ___UIGestureRecognizerUpdate_block_invoke + 57 10 UIKit 0x0153c0be _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 317 11 UIKit 0x015327ac _UIGestureRecognizerUpdate + 199 12 UIKit 0x011dda5a -[UIWindow _sendGesturesForEvent:] + 1291 13 UIKit 0x011de971 -[UIWindow sendEvent:] + 1021 14 UIKit 0x011b05f2 -[UIApplication sendEvent:] + 242 15 UIKit 0x0119a353 _UIApplicationHandleEventQueue + 11455 16 CoreFoundation 0x022c077f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15 17 CoreFoundation 0x022c010b __CFRunLoopDoSources0 + 235 18 CoreFoundation 0x022dd1ae __CFRunLoopRun + 910 19 CoreFoundation 0x022dc9d3 CFRunLoopRunSpecific + 467 20 CoreFoundation 0x022dc7eb CFRunLoopRunInMode + 123 21 GraphicsServices 0x0380a5ee GSEventRunModal + 192 22 GraphicsServices 0x0380a42b GSEventRun + 104 23 UIKit 0x0119cf9b UIApplicationMain + 1225 24 Chi Shin faÃär en hund 0x000dad2a main + 138 25 libdyld.dylib 0x030606d9 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb) 该function如下所示，在iOS8中运行完美，这就是我调用方法的方式。
UITapGestureRecognizer *gestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(pageWordTapped:)]; gestureRecognizer.cancelsTouchesInView = NO; [self.pageLabel addGestureRecognizer:gestureRecognizer];
和function。
- (void) pageWordTapped:(UITapGestureRecognizer *)recognizer{ UITextView *textView = (UITextView *)recognizer.view; CGPoint location = [recognizer locationInView:textView]; // NSLog(@"Tap Gesture Coordinates: %.2f %.2f -- %@", location.x, location.y,textView.text); CGPoint position = CGPointMake(location.x, location.y); //get location in text from textposition at point UITextPosition *tapPosition = [textView closestPositionToPoint:position]; //fetch the word at this position (or nil, if not available) UITextRange *textRange = [textView.tokenizer rangeEnclosingPosition:tapPosition withGranularity:UITextGranularityWord inDirection:UITextLayoutDirectionRight]; NSString *tappedSentence = [textView textInRange:textRange]; NSLog(@"selected :%@ -- %@",tappedSentence,tapPosition); if (!togglePlayIsOn) { for (int i = 0; i < wordArray.count; i ++) { WordModel *wordModel = wordArray[i]; if ((wordModel.word.length - tappedSentence.length) < 3 && [wordModel.word containsString:tappedSentence]) { double timeInterval = [wordModel.endTime doubleValue] - [wordModel.startTime doubleValue]; NSTimeInterval intervalForTimer = timeInterval; NSLog(@"timeInterval :%@, %@, %f", wordModel.startTime, wordModel.endTime, intervalForTimer); [NSTimer scheduledTimerWithTimeInterval:0.0 target:self selector:@selector(highlightWord:) userInfo:@{@"rangeLocation": wordModel.rangeLocation, @"rangeLength": wordModel.rangeLength} repeats:NO]; [NSTimer scheduledTimerWithTimeInterval:intervalForTimer target:self selector:@selector(unHighlightEndOfText:) userInfo:@{@"wordLength": [NSNumber numberWithInt:1]} repeats:NO]; [self playWord:[wordModel.startTime doubleValue] endTime:[wordModel.endTime doubleValue]]; return; } } } }
如果我取消if (!togglePlayIsOn)语句，那么应用程序不会崩溃，所以我相信错误发生在那段代码中。
问题是containsString:是一个iOS8 API，因此在iOS7下崩溃。 你可以替换
[wordModel.word containsString:tappedSentence]
同
[wordModel.word rangeOfString:tappedSentence].location != NSNotFound
检查[NSString containsString:]方法仅在iOS8上可用，要在iOS7上执行此操作，您需要：
NSString *string = @"foo"; if ([string rangeOfString:@"oo"].location == NSNotFound) { } else { }
您使用[wordModel.word containsString:tappedSentence] containsString的代码崩溃在iOS 8及更高版本中可用。 如果您想同时使用iOS 7和iOS 8 +，请使用以下代码 –
使用rangeOfString在类别中实现containsString：
@implementation NSString (Contains) - (BOOL)myContainsString:(NSString*)other { NSRange range = [self rangeOfString:other]; return range.length != 0; }
希望这会帮助你。