如何取消或停止NSThread？ [英] How to cancel or stop NSThread?

问题描述

我正在做一个应用程序，它在读取XML文件时使用NSThread加载viewControllers的内容。

I'm doing an app that loads the contents of viewControllers using NSThread while is reading an XML file.

我完成了如下操作：

-(void)viewDidAppear:(BOOL)animated
{
    // Some code...


    [NSThread detachNewThreadSelector:@selector(loadXML) toTarget:self withObject:nil];
    [super viewDidAppear:YES];
}

-(void)loadXML{

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    // Read XML, create objects...

    [pool release];
}

我的问题是我不知道如何阻止NSThread用户在加载NSThread时更改为另一个viewController，这样做就会崩溃。

My problem is that I don't know how to stop the NSThread if the user changes to another viewController while the NSThread is loading, doing that the app crashes.

我试图取消或退出NSThread，如下所示但没有成功：

I've tried to cancel or exit the NSThread as follows but without success:

-(void)viewsDidDisappear:(BOOL)animated{
    [NSThread cancel];
    // or [NSThread exit];
    [super viewDidDisappear:YES];
}

任何人都可以提供帮助吗？谢谢。

Can anyone help? Thanks.

推荐答案

当您分离新线程时，您无法再从viewDidDisappear等取消或退出它。这些特定于UI的方法执行只在主线程上，所以退出/取消适用于主线程，这显然是错误的。

When you detach new thread, you can no more cancel or exit it from viewDidDisappear etc. These UI specific methods execute only on main thread so the exit/cancel applies to the main thread which is obviously wrong.

而不是使用分离新线程方法，在.h中声明NSThread变量使用 initWithTarget：selector：object： 方法初始化它，并随时随地取消它..

Instead of using the detach new thread method, declare NSThread variable in .h and initialize it using initWithTarget: selector: object: method and cancel it whenever/wherever you want to..

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