不使用块的dispatch_async [英] dispatch_async without using a block

问题描述

我想偶尔使用dispatch_async从我的Web服务器中获取变化的资源(大约每60秒一次).

I want to use dispatch_async to occasionally pull a changing resource from my web server (about every 60 seconds).

我想使用dispatch_async，但是我想给它一个函数名.由于我希望该功能进入睡眠状态，然后再次重做同一件事.

I want to make use of dispatch_async but I want to give it a function name instead. Since I want that function to sleep and redo the same thing again.

这是我正在尝试做的事情dispatch_async(self.downloadQueue, @selector(getDataThread:));(这不会编译)

This is what I am trying to do dispatch_async(self.downloadQueue, @selector(getDataThread:)); (this does not compile)

我认为while循环不是一个好主意，所以我想知道什么是最好的方法

I think a while loop is not a good idea so I'm wondering what was the best approach for this

推荐答案

类似...

NSTimer *timer = [NSTimer timerWithTimeInterval:60 target:self selector:@selector(getDataThread:) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];

- (void)getDataThread:(id)foo {
    dispatch_async(self.downloadQueue, ^{
       // code you want to run asynchronously
    });
}

似乎您希望某些代码块异步运行...但是您希望它们也以一定的时间间隔运行，所以我认为这就足够了.

It seems you want some block of code to run asynchronously... but you want that to also run at a timed interval, so I think this should suffice.

如果您想完全放弃dispatch_async，可以看一下NSOperationQueue，请记住NSOperationQueue是在GCD上构建的，但是您不必担心直接与它接口.

If you want to ditch blocks and dispatch_async altogether you could look at NSOperationQueue, keeping in mind NSOperationQueue is built on GCD but you don't need to worry about interfacing with it directly.

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