- (void)yourButtonTitleTime

{

__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

verBut.userInteractionEnabled = YES;

});

}else{

dispatch_async(dispatch_get_main_queue(), ^{

//设置界面的按钮显示根据自己需求设置

[verBut setTitle:(timeout==0?@"重发":[NSString stringWithFormat:@"%d",timeout]) forState:UIControlStateNormal];

verBut.userInteractionEnabled = timeout==0?YES:NO;

});

timeout--;

}

});

dispatch_resume(_timer);

}