iphone - 在 iPhone 中每 60 秒调用一次方法

Question

我创建了一个 GKSession 并创建了它的对象，它开始搜索设备的可用性，如

 - (void)session:(GKSession *)session peer:(NSString *)peerID didChangeState:(GKPeerConnectionState)state {

我想在每 60 秒后调用这个方法，我该怎么办？

Answer 1

采用NSTimer

NSTimer* myTimer = [NSTimer scheduledTimerWithTimeInterval: 60.0 target: self
                                   selector: @selector(callAfterSixtySecond:) userInfo: nil repeats: YES];

每 60.0 秒后，iOS 将调用以下函数

-(void) callAfterSixtySecond:(NSTimer*) t 
{
    NSLog(@"red");
}

Answer 2

一旦您将 NSTimer 设置为 scheduleWithTimeInterval ，它就会立即调用它。您可以使用

  [self performSelector:@selector(doSomething) withObject:nil afterDelay:60.0f];

Answer 3

使用以下代码：

 NSTimer* timer = [NSTimer scheduledTimerWithTimeInterval: 60.0 target: self
                               selector: @selector(timerFired:) userInfo: nil repeats: YES];

 - (void)timerFired:(NSTimer*)theTimer{
 if(condition){
       [theTimer isValid]; //recall the NSTimer
       //implement your methods
  }else{
      [theTimer invalidate]; //stop the NSTimer
 }
}

Answer 4

斯威夫特 3：

Timer.scheduledTimer(withTimeInterval: 60, repeats: true, block: { (timer) in 
print("That took a minute")
})

Answer 5

您可以使用计划方法...

-(void) callFunction:(CCTime)dt 
{
    NSLog(@"Calling...");
}

你可以使用这个来调用上面的函数...

[self schedule:@selector(callFunction:) interval:60.0f];

Answer 6

斯威夫特 5.0

var timer = Timer.scheduledTimer(timeInterval: 60.0, target: self, selector: #selector(updateTimer), userInfo: nil, repeats: true)

@objc func updateTimer() {
   print("1 min passed")
}