zoukankan      html  css  js  c++  java
  • 倒计时

    @property (nonatomic, assign) NSInteger timeout;

     

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

        button.frame = CGRectMake(100, 100, 200, 100);

        [button setTitle:@"跳转" forState:UIControlStateNormal];

        [button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

        [button setTitleColor:[UIColor grayColor] forState:UIControlStateSelected];

        [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];

        [self.view addSubview:button];

     

    - (void)click:(UIButton *)btn{

        [self countdownButton:btn timeout:59];

    }

    - (void)countdownButton:(UIButton*)button timeout:(NSInteger)totalTime

    {

        //    __block int timeout = totalTime;

        _timeout = totalTime;

        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);

        dispatch_source_set_event_handler(_timer, ^{

            if(_timeout <= 0) {

                dispatch_source_cancel(_timer);

                dispatch_async(dispatch_get_main_queue(), ^{

                    button.selected = NO;

                    button.userInteractionEnabled = YES;

                });

            }

            else {

                int seconds = _timeout % 60;

                button.selected = YES;

                button.userInteractionEnabled = NO;

                

                NSString *strTime = [NSString stringWithFormat:@"%d 秒后重新获取",seconds];

                dispatch_async(dispatch_get_main_queue(), ^{

                    [button setTitle:strTime forState:UIControlStateSelected];

                });

                _timeout--;

            }

        });

        dispatch_resume(_timer);

    }

  • 相关阅读:
    ASP.NET自动给URL加上超链接
    EXCEL隔行相加
    数据库 行列相互转化
    SQL获取所有用户名,数据库名、所有表名、所有字段名及字段类型
    C#中,Dictionary的使用方法
    NET技术.NET各大网站编程技术网址
    多表查询不同数据库服务器上的表
    关于quotename的用法
    SQL Server2005 异常处理机制(Begin try Begin Catch)
    C#异步调用与线程总结
  • 原文地址:https://www.cnblogs.com/h-tao/p/5156915.html
Copyright © 2011-2022 走看看