获取验证码及按钮倒计时

//获取验证码接口
+ (NSDictionary *)getPhoneCodeWithPhoneWithParamDict:(NSDictionary *)paramDict vertifyButton:(UIButton *)vertifyButton urlStr:(NSString *)urlStr
{
    NSMutableDictionary *resultDictionary = [[NSMutableDictionary alloc] init];
    [(BaseViewController *)[HelpModel getCurrentVC] showLoading:@"加载中..."];
    UserCentRequest *request = [[UserCentRequest alloc] init];
    [request getInfoWithDict:paramDict Url:urlStr onSuccess:^(NSDictionary *resultDict) {
        YTLog(@"%@",resultDict);
        [resultDictionary setDictionary:resultDict];
        YTLog(@"%@",resultDict[@"message"]);
        [(BaseViewController *)[HelpModel getCurrentVC] hideLoading];
        if ([resultDict[@"code"] integerValue] == 00) {
            [HelpModel receiveCheckNumButtonWithVertifyButton:vertifyButton];
            //            [self receiveCheckNumButton];
            //            self.random = resultDict[@"random"];
            //            self.randJnlNo = resultDict[@"randJnlNo"];
            //            self.messageTaskId = resultDict[@"messageTaskId"];
        }else{
            [(BaseViewController *)[HelpModel getCurrentVC] showMessage:resultDict[@"message"]];
        }
    } andFailed:^(NSInteger statusCode, NSString *errorMsg) {
        YTLog(@"%@",errorMsg);
        [(BaseViewController *)[HelpModel getCurrentVC] hideLoading];
    }];
    return resultDictionary;
}

//获取验证码按钮倒计时
+ (void)receiveCheckNumButtonWithVertifyButton:(UIButton *)btn{
    
    __block int timeout= 59; //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
                [btn setTitle:@"获取验证码" forState:UIControlStateNormal];
                btn.backgroundColor = UIColorFromRGB(0x028ED9);
                btn.userInteractionEnabled = YES;
            });
        }else{
            //            int minutes = timeout / 60;
            int seconds = timeout % 60;
            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];
                [btn setTitle:[NSString stringWithFormat:@"%@秒后重发",strTime] forState:UIControlStateNormal];
                btn.backgroundColor = [UIColor grayColor];
                [UIView commitAnimations];
                btn.userInteractionEnabled = NO;
            });
            timeout--;
        }
    });
    dispatch_resume(_timer);
}