- 执行一次
double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
//执行事件
});
- 重复执行
NSTimeInterval period = 1.0; //设置时间间隔
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
dispatch_source_set_timer(_timer, dispatch_walltime(NULL, 0), period * NSEC_PER_SEC, 0); //每秒执行
dispatch_source_set_event_handler(_timer, ^{
//在这里执行事件
});
dispatch_resume(_timer);
- 倒计时
#pragma mark Timer － 短信计时
-(void)startTime{
__block int timeout=60; //倒计时时间
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue);
dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行
dispatch_source_set_event_handler(_timer, ^{
if(timeout<=0){ //倒计时结束，关闭
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//设置界面的按钮显示 根据自己需求设置
[self.verifyButton setTitle:@"发送验证码" forState:UIControlStateNormal];
self.verifyButton.backgroundColor = RGB(39, 142, 251);
[self.verifyButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
self.verifyButton.enabled = YES;
});
}else{
int seconds = timeout % 120;
NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
dispatch_async(dispatch_get_main_queue(), ^{
//设置界面的按钮显示 根据自己需求设置
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[self.verifyButton setTitle:[NSString stringWithFormat:@"%@ 秒后重发",strTime] forState:UIControlStateNormal];
[UIView commitAnimations];
self.verifyButton.backgroundColor = RGB(234, 235, 236);
[self.verifyButton setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
self.verifyButton.enabled = NO;
});
timeout--;
}
});
dispatch_resume(_timer);
}