ios 两种实现定时器的不同方

一、 NSTimer

(还可以传值,做你想做的事)

- (IBAction)timerAction:(UIButton *)sender {

_timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(countDown:) userInfo:@{@"btn" : sender} repeats:YES];

}

当你所需要定时的时间走完之后重新定时列如60秒

- (void)countDown:(NSTimer *)timer{

UIButton *btn = timer.userInfo[@"btn"];

[btn setUserInteractionEnabled:NO];

count -- ;

[btn setTitle:[NSString stringWithFormat:@"%lds",(long)count] forState:UIControlStateNormal];

if (count == 0) {

count = 60;

[btn setTitle:@"重新发送" forState:UIControlStateNormal];

[btn setUserInteractionEnabled:YES];

[_timer invalidate];

_timer = nil;

}

}

别忘了释放_time,但是网上好多说法--这样释放不掉timer,因为被RunLoop强引用了...

-(void)dealloc

{

[_timer invalidate];

_timer = nil;

NSLog(@"%@ dealloc", NSStringFromClass([self class]));

}

二、使用CGD

#pragma mark GCD 倒计时

- (IBAction)gcdAction:(UIButton *)sender {

[sender setUserInteractionEnabled:NO];

__block int timeout = 60;

dispatch_queue_t quene =  dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

dispatch_source_t timer  = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, quene);

dispatch_source_set_timer(timer, dispatch_walltime(NULL, 0), 1.0 * NSEC_PER_SEC, 0);

dispatch_source_set_event_handler(timer, ^{

if (timeout == 0) {

dispatch_source_cancel(timer);

dispatch_async(dispatch_get_main_queue(), ^{

[sender setUserInteractionEnabled:YES];

[sender setTitle:@"重新发送" forState:UIControlStateNormal];

});

}else{

timeout -- ;

dispatch_async(dispatch_get_main_queue(), ^{

[sender setTitle:[NSString stringWithFormat:@"%ds",timeout] forState:UIControlStateNormal];

});

}

});

dispatch_resume(timer);

}

闲下来时就因该学习一下.Demo以上传到gitHub上面 感兴趣的小伙伴可以下载探讨一下,有问题或者建议欢迎骚扰!

笔尖下的诱惑~