从后台线程显示的UIAlertView没有委托创建EXC_BAD_ACCESS [英] UIAlertView shown from background thread and with no delegate creates EXC_BAD_ACCESS

问题描述

这是我的代码：

#ifdef DEBUG
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"ERROR" message:@"JSON Parsing Error" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alertView show];
    [alertView release];
#endif

此代码在后台线程中执行（负责解析），以及错误只会每隔一段时间发生一次。关于这里有什么问题的任何想法？

This code is executed in a background thread (responsible for parsing), and the error only happens every other time. Any idea on what is the problem here?

推荐答案

不要在后台线程中弄乱UI。创建一个方法并在主线程上调用该方法：

Dont mess with the UI from the background thread. Create a method and call that method on the main thread:

[someObject performSelectorOnMainThread:@selector(showDebug:)
                             withObject:@"JSON Parsing Error"
                          waitUntilDone:YES];

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