全局方法
/**
倒计时
@param time 时间
@param countDownBlock 倒计时阶段执行
@param endBlock 结束后执行
*/
+ (void)countDownWithTime:(int)time
countDownBlock:(void (^)(int timeLeft))countDownBlock
endBlock:(void (^)())endBlock
{
__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(), ^{
if (endBlock) {
endBlock();
}
});
} else {
dispatch_async(dispatch_get_main_queue(), ^{
if (countDownBlock) {
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
countDownBlock(timeout);
[UIView commitAnimations];
}
timeout--;
});
}
});
dispatch_resume(_timer);
}
调用方法：
[GlobalFunc countDownWithTime:5 countDownBlock:^(int timeLeft) {
[self.button setTitle:[NSString stringWithFormat:@"%d 跳过",timeLeft] forState:UIControlStateNormal];
} endBlock:^{
[UIView animateWithDuration:0.4 animations:^{
self.alpha = 0.0f;
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
}];
