自己尝试一下:
子类UITextFIEld.
- (ID)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { self.delegate = self; } return self;}
它应该崩溃
编辑
回溯:
* thread #1: tID = 0x3bb8d,0x39f14726 libobjc.A.dylib`lookUpImpOrNil + 18,queue = 'com.apple.main-thread,stop reason = signal SIGStop frame #0: 0x39f14726 libobjc.A.dylib`lookUpImpOrNil + 18 frame #1: 0x39f0dcb6 libobjc.A.dylib`class_respondsToSelector + 34 frame #2: 0x39f1d05c libobjc.A.dylib`-[NSObject respondsToSelector:] + 32 frame #3: 0x323b9242 UIKit`-[UITextFIEld respondsToSelector:] + 46 frame #4: 0x325c88a2 UIKit`-[UITextFIEld customOverlayContainer] + 50 frame #5: 0x325c8730 UIKit`-[UITextFIEld automaticallySelectedOverlay] + 28 frame #6: 0x32554208 UIKit`-[UIKeyboardImpl inputOverlayContainer] + 424 frame #7: 0x32553942 UIKit`-[UIKeyboardImpl _autocorrectPromptRects] + 454 frame #8: 0x323c7530 UIKit`-[UIKeyboardImpl updateautocorrectPrompt:] + 368 frame #9: 0x323e63e0 UIKit`-[UIDelayedAction timerFired:] + 80 frame #10: 0x305fbe6c Foundation`__NSFireTimer + 64 frame #11: 0x2fbe1e86 CoreFoundation`__CFRUNLOOP_IS_CALliNG_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 14 frame #12: 0x2fbe1aa2 CoreFoundation`__CFRunLoopDoTimer + 794 frame #13: 0x2fbdfe2a CoreFoundation`__CFRunLoopRun + 1218 frame #14: 0x2fb4a540 CoreFoundation`CFRunLoopRunspecific + 524 frame #15: 0x2fb4a322 CoreFoundation`CFRunLoopRunInMode + 106 frame #16: 0x348812ea GraphiCSServices`GSEventRunModal + 138 frame #17: 0x324011e4 UIKit`UIApplicationMain + 1136 frame #18: 0x0009929c Today`main(argc=1,argv=0x27d79c80) + 164 at main.m:29解决方法 在使用自委托的UITextFIEld子类时,我遇到同样的问题.如果不可能将委托人更改为自己以外的其他东西,我建议覆盖respondToSelector,而不是实现一个可能返回无效对象的customOverlayContainer方法(你确定它应该是UITextFIEld的一个实例吗?你如何知道iOS不要求UIVIEw或CGLayer或任何其他类型的对象?)
-(BOol) respondsToSelector:(SEL)aSelector { Nsstring * selectorname = NsstringFromSelector(aSelector); if ([selectorname isEqualToString:@"customOverlayContainer"]) { NSLog(@"preventing self.delegate == self crash"); return NO; } return [super respondsToSelector:aSelector];}总结
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