iPhone - NSTimer在火灾后不再重复

Question

我正在创建并解雇NSTimer:

ncTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
                                           target:self
                                         selector:@selector(handleTimer:)
                                         userInfo:nil
                                          repeats:YES];
[ncTimer fire];

和

- (void)handleTimer:(NSTimer *)chkTimer {
    // do stuff
}

我保留我的计时器:

@property (nonatomic, retain) NSTimer *ncTimer;

由于某种原因,计时器不重复.它只发射一次而不是再发射一次.

Answer 1

该-fire:方法手动触发一次.要启动和重复计时器,您必须使用它将其添加到runloop[[NSRunLoop currentRunLoop] addTimer: forMode:]

Answer 2

得到它了

添加计时器mainRunLoop使其正常工作

干得好:

目标C:

self.ncTimer = [NSTimer timerWithTimeInterval:2.0 target:self selector:@selector(handleTimer:) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];

迅速:

var ncTimer = NSTimer(timeInterval: 2.0, target: self, selector: Selector("handleTimer"), userInfo: nil, repeats: true)
NSRunLoop.mainRunLoop().addTimer(ncTimer, forMode: NSDefaultRunLoopMode)

Answer 3

您不能只将分配给已作为属性放入标题的计时器.这应该工作:

self.ncTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
 target:self selector:@selector(handleTimer:) userInfo:nil repeats: YES];

另外:fire方法触发定时器,不在循环中.如果计时器不重复,则无效.在说明火线之后,添加:

BOOL timerState = [ncTimer isValid];
NSLog(@"Timer Validity is: %@", timerState?@"YES":@"NO");

Answer 4

您还可以在此块中复制代码,该代码在主线程中插入Timer的创建.

因此代码将保留:

dispatch_async(dispatch_get_main_queue(), ^{
  self.ncTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
                 target:self selector:@selector(handleTimer:) userInfo:nil repeats: YES];
});