我有一个带有 NSTimer 的 iPhone 应用程序，名为 pressTimer，每当有人触摸此按钮时，该应用程序就会关闭。问题是他们经常触摸按钮，我希望计时器在他们抬起手指时停止。因此，我在 .h 中声明了 pressTimer 并在 .m 中合成了它，然后分配并在我创建的 TouchDown 操作上启动它。我在 TouchUpInside 操作上使用代码 [pressTimer invalidate] 来取消计时器，因为它是一个全局变量。它似乎可以很好地取消计时器，但是当我实际触发计时器时，程序完全卡住，即使我没有收到代码错误或警告。我是菜鸟，所以请不要太粗暴:0
更新:控制台日志 - 谢谢大家!
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2010-07-01 16:39:30.981 Clickkr[1573:307] -[__NSCFData invalidate]: unrecognized selector sent to instance 0x154b40
2010-07-01 16:39:30.999 Clickkr[1573:307] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFData invalidate]: unrecognized selector sent to instance 0x154b40'
*** Call stack at first throw:
(
0 CoreFoundation 0x309a5fd3 __exceptionPreprocess + 114
1 libobjc.A.dylib 0x318b58a5 objc_exception_throw + 24
2 CoreFoundation 0x309a9a77 -[NSObject(NSObject) doesNotRecognizeSelector:] + 102
3 CoreFoundation 0x309a8f15 ___forwarding___ + 508
4 CoreFoundation 0x3093b680 _CF_forwarding_prep_0 + 48
5 Clickkr 0x00002b23 -[MyViewController addOne:] + 42
6 CoreFoundation 0x309307ad -[NSObject(NSObject) performSelector:withObject:withObject:] + 24
7 UIKit 0x31e1f829 -[UIApplication sendAction:to:from:forEvent:] + 84
8 UIKit 0x31e1f7c9 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 32
9 UIKit 0x31e1f79b -[UIControl sendAction:to:forEvent:] + 38
10 UIKit 0x31e1f4ed -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 356
11 UIKit 0x31e1fb3b -[UIControl touchesEnded:withEvent:] + 342
12 UIKit 0x31e1e4ed -[UIWindow _sendTouchesForEvent:] + 368
13 UIKit 0x31e1de67 -[UIWindow sendEvent:] + 262
14 UIKit 0x31e19b5b -[UIApplication sendEvent:] + 298
15 UIKit 0x31e19507 _UIApplicationHandleEvent + 5022
16 GraphicsServices 0x30a8c147 PurpleEventCallback + 666
17 CoreFoundation 0x3097baab __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 26
18 CoreFoundation 0x3097d84f __CFRunLoopDoSource1 + 166
19 CoreFoundation 0x3097e62d __CFRunLoopRun + 520
20 CoreFoundation 0x309278eb CFRunLoopRunSpecific + 230
21 CoreFoundation 0x309277f3 CFRunLoopRunInMode + 58
22 GraphicsServices 0x30a8b6ef GSEventRunModal + 114
23 GraphicsServices 0x30a8b79b GSEventRun + 62
24 UIKit 0x31dc32a7 -[UIApplication _run] + 402
25 UIKit 0x31dc1e17 UIApplicationMain + 670
26 Clickkr 0x00002333 main + 70
27 Clickkr 0x000022e8 start + 40
)
terminate called after throwing an instance of 'NSException'
Program received signal: “SIGABRT”.
最佳答案
这是我使计时器无效的方法:
[timer invalidate];
timer = nil;
您可能遇到的问题是，一旦计时器无效，它就会从运行时循环中删除，当有人想要访问它时，您的程序就会崩溃。使其无效后，使其为零即可。这样，如果有人想发送消息或对其执行任何操作，它会将其发送为零。
关于iphone - 如何正确地使 NSTimer 失效，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/3161303/