GCD实现倒计时

来源：互联网发布：淘宝金鹰男士假货编辑：程序博客网时间：2024/06/07 04:49

__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
                    [_sendCodeBtn setTitle:@"" forState:UIControlStateNormal];
                    [_sendCodeBtn setBackgroundImage:[UIImage imageNamed:@"btn_send_code"] forState:UIControlStateNormal];
                    [_sendCodeBtn setUserInteractionEnabled: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
                    //                    NSLog(@"____%@",strTime);
                    [_sendCodeBtn setTitle:[NSString stringWithFormat:@"%@秒后重新获取",strTime] forState:UIControlStateNormal];
                    [_sendCodeBtn setBackgroundImage:[UIImage imageNamed:@"btn_send_code_disabled"] forState:UIControlStateNormal];
                    [_sendCodeBtn setUserInteractionEnabled:NO];
                });
                timeout--;

            }
        });
        dispatch_resume(_timer);
    }

0 0