使用
dispatch_source_create
dispatch_source_set_timer
dispatch_source_set_event_handler
dispatch_resume
dispatch_suspend
dispatch_cancel
备注
timer 销毁使用 dispatch_cancel，须在dispatch_resume状态下执行 cancel
关键实现
- (void)createTimer {
self.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, self.queue);
dispatch_source_set_timer(self.timer, dispatch_walltime(**NULL**, 0), 1.0 * NSEC_PER_SEC, 0.0 * NSEC_PER_SEC);
dispatch_source_set_event_handler(self.timer, ^{
dispatch_async(dispatch_get_main_queue(), ^{
// task
});
});
}
- (void)startTimer {
dispatch_resume(self.timer);
self.stopped = NO;
NSLog(@"timer started ... ");
}
- (void)stopTimer {
dispatch_suspend(self.timer);
self.stopped = YES;
NSLog(@"timer suspended ... ");
}
- (void)destroyTimer {
if (self.stopped) {
[self startTimer];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
dispatch_cancel(self.timer);
self.stopped = YES;
self.timer = nil;
NSLog(@"timer destroyed ... ");
});
} else {
dispatch_cancel(self.timer);
self.stopped = YES;
self.timer = nil;
NSLog(@"timer destroyed ... ");
}
}
完整项目
