在ScheduledTimerWithTimeInterval中调用类级别的方法 [英] call a class level method in scheduledTimerWithTimeInterval

问题描述

我为Alert创建了一个类级方法:

I make a class level method for Alert:

@interface TestAlert
@end
+ (void)showErrorAlert:(NSTimer *)message
{
.......
 UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:messageIn delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
    [alert show];
}

，我想直接在 scheduledTimerWithTimeInterval 中调用它，例如:

and I want to call it directly in scheduledTimerWithTimeInterval like:

    [NSTimer scheduledTimerWithTimeInterval:0.001 target:TestAlert selector:@selector( showErrorAlert:) userInfo:error repeats:NO];

当然有语法错误.

我知道我可以将 showErrorAlert 放在方法中:

I know I can put showErrorAlert to a method:

- (void)showError:(NSTimer *)timer
{
    //NSLog(@"show error %@", error);
    [TestAlert showErrorAlert:(NSString *)[timer userInfo]];
}

然后

[NSTimer scheduledTimerWithTimeInterval:0.001 target:self selector:@selector(showError:) userInfo:error1 repeats:NO];

但是调用 showErrorAlert 时会导致崩溃，因为已经释放了 showErro r方法中的错误消息.

But it will cause crash when showErrorAlert is called, because error message from showError method has been released.

我可以直接调用 showErrorAlert 吗，如果不能，应该如何避免错误消息的发布?

Can i call showErrorAlert directly, If I can't, how should I avoid error message's release ?

推荐答案

只需使用 [TestAlert类] 作为目标，而不是 TestAlert .

Just use [TestAlert class] as a target instead of TestAlert.

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