学习别人的一个方便快捷的倒计时实现
__block int timeout = time; //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.phoneLoginVC.sendCode setTitle:@"发送验证码" forState:UIControlStateNormal];
//self.phoneLoginVC.sendCode.userInteractionEnabled = true;
});
}else{
int seconds = timeout % 61;
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.phoneLoginVC.sendCode setTitle:[NSString stringWithFormat:@"%@秒",strTime] forState:UIControlStateNormal];
[UIView commitAnimations];
//self.phoneLoginVC.sendCode.userInteractionEnabled = false;
});
timeout--;
}
});
dispatch_resume(_timer);
