问题描述
在performSelector waitsUntilDone期间是否可以取消线程?
Is it possible to cancel a thread while performSelector waitsUntilDone?
参见下文:
我在以下行中有一个while循环:
I have a while loop with following line:
[self performSelector:@selector(getMyRecords:) onThread:myThread withObject:i waitUntilDone:YES]
有时，我需要在执行循环时取消线程 myThread .我遇到以下崩溃问题:
Sometimes, I need to cancel my thread myThread while my loop executes. I get following crash issue:
Terminating app due to uncaught exception 'NSDestinationInvalidException', reason: '*** -[MyController performSelector:onThread:withObject:waitUntilDone:modes:]: target thread exited while waiting for the perform'
推荐答案
查看NSObject的文档:
Check out the documentation of NSObject:
您不能取消已排队的邮件使用这种方法.如果您想要取消消息的选项当前线程，您必须使用这performSelector:withObject:afterDelay:或者performSelector:withObject:afterDelay:inModes:方法.
You cannot cancel messages queued using this method. If you want the option of canceling a message on the current thread, you must use either the performSelector:withObject:afterDelay: or performSelector:withObject:afterDelay:inModes: method.
此方法保留接收者和arg参数，直到之后选择器已执行.
This method retains the receiver and the arg parameter until after the selector is performed.
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