iPhone performSelector问题 [英] IPhone performSelector issue

问题描述

我有工作代码:[self performSelector:@selector(doSomething)];

I have working code: [self performSelector:@selector(doSomething) ];

但是当我将此行更改为:

but when I change this line to:

[[self performSelector:@selector(doSomething)withObject:nil afterDelay:1.0];

[self performSelector:@selector(doSomething) withObject:nil afterDelay:1.0];

它报告错误-无法识别的选择器....

it reports error - unrecognized selector....

你能告诉我问题出在哪里吗?

could you tell me what is the problem in?

谢谢

推荐答案

如果您更改了采用对象参数的方法，则需要更改 @selector()参数以包括:"，例如 @selector(doSomething:)

If you changed your method to take an object parameter then you need to change the @selector() argument to include the ":", e.g., @selector( doSomething: )

这有效:

- (void) foo
{
    NSLog(@"foo!");
}


- (void)applicationDidFinishLaunching:(NSNotification *)aNotification 
{        
    [self performSelector: @selector(foo) withObject: nil afterDelay: 0.1];
}

因此您可以将不带参数的选择器传递给 performSelector:withObject:afterDelay:，并且我想它会忽略我不是100％的 withObject:参数肯定的.

So you can pass a selector that takes no param to performSelector:withObject:afterDelay: and I presume it ignores the withObject: param which I wasn't 100% sure of.

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