ios scheduleTimerWithTimeInterval 的时间量 [英] ios scheduledTimerWithTimeInterval for amount of time

问题描述

我想使用 scheduleTimerWithTimeInterval 来在一定时间内执行周期性任务，比如说一小时.但是我如何在我的代码上实现.这是我的代码:

I want to use scheduledTimerWithTimeInterval to do a periodic task for certain amount of time lets say one hour. but How do I implement on my code. Here is my code:

timer = [NSTimer scheduledTimerWithTimeInterval: 0.1
                                          target: self
                                        selector: @selector(doSomething:)
                                        userInfo: nil
                                         repeats: YES];

推荐答案

让我们假设一分钟.

这是一个简单的场景，

int remainingCounts;
NSTimer *timer;

timer = [NSTimer scheduledTimerWithTimeInterval:1 target:(self) selector:@selector(countDown) userInfo:nil repeats:YES];
remainingCounts = 60;   // int remainingCounts ;...

每秒钟调用一次方法.

-(void)countDown {
    NSLog(@"%d", remainingCounts);
    // Do Your stuff......
    if (--remainingCounts == 0) {
        //[self dismissViewControllerAnimated:YES completion:nil]; 
        [timer invalidate];
    }
}

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