将方法作为参数传递

发布于 2024-12-10 00:12:14 字数 448 浏览 5 评论 0原文

我可以传递一个方法作为参数吗？在下面的示例中，我没有成功传递 targetOpenView 方法：

-(void) targetTimeView:(id)sender {    
[self TimeViewWithtimeInterval:.6 selector:targetOpenView]; //targetOpenView does NOT work
}

-(void) timeViewWithtimeInterval:(float)interval selector:openViewMethod{
[NSTimer scheduledTimerWithTimeInterval:interval target:self selector:@selector(openViewMethod) userInfo:nil repeats:NO];   
}

有什么建议可以让我完成这项工作吗？谢谢！

原文

can I pass a method as an argument?
I don't succeed to pass the method targetOpenView in the example below:

-(void) targetTimeView:(id)sender {    
[self TimeViewWithtimeInterval:.6 selector:targetOpenView]; //targetOpenView does NOT work
}

-(void) timeViewWithtimeInterval:(float)interval selector:openViewMethod{
[NSTimer scheduledTimerWithTimeInterval:interval target:self selector:@selector(openViewMethod) userInfo:nil repeats:NO];   
}

Any suggestions how I could make this work? Thanks!

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没有你我更好 2024-12-17 00:12:14

您需要 @selector 编译器指令从方法名称中提取选择，就像创建计时器时所做的那样：

[self TimeViewWithtimeInterval:.6 selector:@selector(targetOpenView)];

并将参数定义为类型 SEL：

-(void) TimeViewWithtimeInterval:(float)interval selector:(SEL)openViewMethod
{    
 ...
}

然后，当将参数传递给 NSTimer 方法，您可以省略 @selector 因为该类型已经是一个选择器：

[NSTimer scheduledTimerWithTimeInterval:interval target:self
                               selector:@selector(openViewMethod) /* here */
                               userInfo:nil repeats:NO];   

[NSTimer scheduledTimerWithTimeInterval:interval target:self
                               selector:openViewMethod /* pass it directly */
                               userInfo:nil repeats:NO];

You need the @selector compiler directive to extract the select from a method name, like you did when creating the timer:

[self TimeViewWithtimeInterval:.6 selector:@selector(targetOpenView)];

And define your argument to the type SEL:

-(void) TimeViewWithtimeInterval:(float)interval selector:(SEL)openViewMethod
{    
 ...
}

Then, when passing the argument to the NSTimer method you can leave off the @selector since the type is already a selector:

[NSTimer scheduledTimerWithTimeInterval:interval target:self
                               selector:@selector(openViewMethod) /* here */
                               userInfo:nil repeats:NO];   

[NSTimer scheduledTimerWithTimeInterval:interval target:self
                               selector:openViewMethod /* pass it directly */
                               userInfo:nil repeats:NO];

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