pragma mark----定時器
- (void)beginTimer {
self.timer = [NSTimer scheduledTimerWithTimeInterval:60*60
target:self
selector:@selector(WeatherNotice)
userInfo:nil
repeats:YES];
}
//開啟定時器
[_timer setFireDate:[NSDate distantPast]];
//暫停定時器
[_timer setFireDate:[NSDate distantFuture]];
//取消定時器
[_timer invalidate];
_timer=nil;
