所以,我有一个UITextField子类,它是自己的Delegate,并且当使用键盘快捷键时崩溃.它最多在cpu上,不会发生错误.没有分配自己作为代表,它的工作没有问题.当它被分配为委托时,即使不使用(可选)方法也会崩溃.
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];
}
