带有多个参数的 iOS performSelectorOnMainThread [英] iOS performSelectorOnMainThread with multiple arguments

问题描述

我想从另一个线程在主线程上执行一个选择器，但是选择器有多个参数，类似于:

I would like to perform a selector on the main thread from another thread, but the selector has multiple arguments, similar to this:

-(void) doSomethingWith:(int) a b:(float)b c:(float)c d:(float)d e:(float)e {//...}

如何使用 performSelectorOnMainThread: withObject: waitUntilDone: 实现此功能?

How can I get this working with performSelectorOnMainThread: withObject: waitUntilDone:?

编辑

我想解释一下为什么我需要这个.

I would like to explain why i need this.

我在主线程上使用 UIImageViews，我在另一个线程上为它们进行计算.我使用了很多计算，所以如果我在主线程上做所有事情，应用程序就会滞后.我知道 UI 元素只能在主线程上操作，这就是为什么我希望它以这种方式工作，因此主线程可以无延迟地监听触摸事件.

I'm working with UIImageViews on the main thread, and I make the calculations for them on another thread. I use a lot of calculations so if i make everything on the main thread, the app lags. I know that UI elements can only be manipulated on the main thread, this is why i would like it to work this way, so the main thread can listen to touch events without lags.

推荐答案

当您使用 iOS >= 4 时，您应该这样做:

When you're using iOS >= 4, you'd do this instead:

dispatch_async(dispatch_get_main_queue(), ^{
    [self doSomething:1 b:2 c:3 d:4 e:5];
});

这就像在做 waitUntilDone:NO.如果您想等到方法完成，请改用 dispatch_sync.

That's like doing waitUntilDone:NO. If you want to wait until the method is finished, use dispatch_sync instead.

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