如何将参数传递给在 NSTimer 中调用的方法

问题描述

我有一个计时器调用一个方法，但是这个方法需要一个参数:

I have a timer calling a method but this method takes one paramether:

theTimer = [NSTimer scheduledTimerWithTimeInterval:animationInterval target:self selector:@selector(timer) userInfo:nil repeats:YES];

应该是

theTimer = [NSTimer scheduledTimerWithTimeInterval:animationInterval target:self selector:@selector(timer:game) userInfo:nil repeats:YES];

现在这种语法似乎不正确.我尝试使用 NSInvocation，但遇到了一些问题:

now this syntax doesn't seems to be right. I tried with NSInvocation but I got some problems:

timerInvocation = [NSInvocation invocationWithMethodSignature:
        [self methodSignatureForSelector:@selector(timer:game)]];

theTimer = [NSTimer scheduledTimerWithTimeInterval:animationInterval
        invocation:timerInvocation
        repeats:YES];

我应该如何使用调用?

推荐答案

鉴于此定义:

- (void)timerFired:(NSTimer *)timer
{
   ...
}

然后您需要使用 @selector(timerFired:) (这是不带任何空格或参数名称的方法名称，但包括冒号).您要传递的对象(game ?)通过 userInfo: 部分传递:

You then need to use @selector(timerFired:) (that's the method name without any spaces or argument names, but including the colons). The object you want to pass (game ?) is passed via the userInfo: part:

theTimer = [NSTimer scheduledTimerWithTimeInterval:animationInterval
                                            target:self
                                          selector:@selector(timerFired:)
                                         userInfo:game
                                          repeats:YES];

在您的计时器方法中，您可以通过计时器对象的 userInfo 方法访问此对象:

In your timer method, you can then access this object via the timer object's userInfo method:

- (void)timerFired:(NSTimer *)timer
{
    Game *game = [timer userInfo];
    ...
}

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