使用ReactiveCocoa 实现简单的验证码按钮

1 创建按钮

 UIButton *yzmButton = [UIButton buttonWithType:UIButtonTypeCustom];    yzmButton.backgroundColor = [UIColor orangeColor];    yzmButton.titleLabel.font = [UIFont systemFontOfSize:13];    [yzmButton setTitle:@"获取验证码" forState:UIControlStateNormal];    [yzmButton addTarget:self action:@selector(startTime:) forControlEvents:UIControlEventTouchUpInside];    [self addSubview:yzmButton]; [yzmButton mas_makeConstraints:^(MASConstraintMaker *make) {    make.top.mas_equalTo(weakSelf.lastLabel.mas_bottom).offset(15);       make.centerX.mas_equalTo(weakSelf.mas_centerX);        make.size.mas_equalTo(CGSizeMake(90, 40));    }];

2 实现点击方法

-(void)startTime:(UIButton *)l_timeButton{    __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（倒计时结束后调用）                [l_timeButton setTitle:@"发送验证码" forState:UIControlStateNormal];                //设置不可点击                l_timeButton.userInteractionEnabled = YES;                l_timeButton.backgroundColor = [UIColor orangeColor];            });        }else{            //            int minutes = timeout / 60;    //这里注释掉了，这个是用来测试多于60秒时计算分钟的。            int seconds = timeout % 60;            NSString *strTime = [NSString stringWithFormat:@"%d", 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);                [l_timeButton setTitle:[NSString stringWithFormat:@"%@秒后可重新发送",strTime] forState:UIControlStateNormal];                //设置可点击                l_timeButton.userInteractionEnabled = NO;                l_timeButton.backgroundColor = [UIColor lightGrayColor];            });            timeout--;        }    });    dispatch_resume(_timer);}