计划一个计时器来更新一些计数器：
-(void)_tock:(NSTimer *)aTimer {
NSLog(@"%p %p tock from %p", self, [NSThread currentThread], aTimer);
...
}
它从主线程设置并自动添加到运行循环（使用调度而不是 timerWith）：
-(void)setRotationsPerMinute:(float)rotationsPerMinute
{
// force calling from the main thread - as per hint on the invalidate method.
[self performSelectorOnMainThread:@selector(setRotationsPerMinuteObj:)
withObject:[NSNumber numberWithFloat:rotationsPerMinute]
waitUntilDone:NO];
}
-(void)setRotationsPerMinuteObj:(NSNumber *)rotationsPerMinuteAsObj
{
_rotationsPerMinute = [rotationsPerMinuteAsObj floatValue];
[self.rotationUpdateTimer invalidate]; // <----- invalide timer
self.rotationUpdateTimer = nil; // <----- wipe
....
// <--- replace timer
self.rotationUpdateTimer = [NSTimer scheduledTimerWithTimeInterval:interval
target:self
selector:@selector(_tock:)
userInfo:nil
repeats:YES];**
NSLog(@"%p %p New timer is %p - will fire in %f seconds", self,
[NSThread currentThread], self.rotationUpdateTimer, interval);
[self setNeedsDisplay];
}
这最初花费很大。但是，当我由于远程推送通知来更改它时 - 不知何故它不再触发。
调试输出显示了很好的触发：
2013-07-29 14:46:21.999 XXX[589:707] 0x1523b0 0x11a5e0 tock from 0x178890
2013-07-29 14:46:22.014 XXX[589:707] 0x1523b0 0x11a5e0 tock from 0x178890
2013-07-29 14:46:22.029 XXX[589:707] 0x1523b0 0x11a5e0 tock from 0x178890
2013-07-29 14:46:22.044 XXX[589:707] 0x1523b0 0x11a5e0 tock from 0x178890
2013-07-29 14:46:22.063 XXX[589:707] 0x1523b0 0x11a5e0 tock from 0x178890
然后我们得到一个推入 - 它执行 setRotationsPerMinute:XX 调用。
2013-07-29 14:46:22.074 XXX[589:707] Push received: {
aps = {
alert = XXX;
badge = 1;
sound = default;
};
}
作为 setRotationsPerMinute: 调用的结果，我们看到了变化：
2013-07-29 14:46:22.081 XXX[589:707] Makers 1 - active 1 -- 16.000000
然后创建新的计时器：
2013-07-29 14:46:22.089 XXXX[589:707] 0x1523b0 0x11a5e0 New timer is 0x15dbc0 - will fire in 0.060000 seconds
但是 - 它不会从那里开火。任何建议 - 感觉我错过了一些非常明显的东西！
谢谢 ！