iPhone - NSTimer在火灾后不再重复 [英] iPhone - NSTimer not repeating after fire

问题描述

我正在创建并触发 NSTimer ，其中包含：

I am creating and firing a NSTimer with:

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

AND

- (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，计时器不会重复。它只发射一次而不是再发射一次。

For some reason the timer is not repeating. It is firing once only and than never again.

推荐答案

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：

You can't just assign to the timer that you have put as a property in your header. This should work:

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。在说明火的行之后，添加：

Also: The fire method fires the timer, out of cycle. If the timer is non repeating it is invalidated. After the line that says fire, add this:

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

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