NSTimer 倒计时

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#pragma mark - 倒计时- (void)startCount{    /**     *  添加定时器     */    self.currentCountDown = 120;    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countDown) userInfo:nil repeats:YES];    [[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];    [self.timer fire];}- (void)countDown{    if (self.currentCountDown >0) {        //设置界面的按钮显示 根据自己需求设置        [self.captchaBtn setTitle:[NSString stringWithFormat:@"(%ld)重新获取",(long)self.currentCountDown] forState:UIControlStateNormal];        //self.captchaBtn.enabled = NO;        self.currentCountDown -= 1;    }else{        [self removeTimer];    }}/** *  移除定时器 */- (void)removeTimer{    self.currentCountDown = 0;    [self setCaptchaEnable:YES];    [self.timer invalidate];    self.timer = nil;}//因为iOS 7下 按钮 enabled= NO, 不能设置文字#pragma mark - 设置按钮状态- (void)setCaptchaEnable:(BOOL)enabled{    //可以按    if (enabled) {        self.captchaBtn.userInteractionEnabled = YES;        [self.captchaBtn setBackgroundImage:[UIImage imageNamed:@"back_red"] forState:UIControlStateNormal];        [self.captchaBtn setTitle:@"获取验证码" forState:UIControlStateNormal];    }else{        self.captchaBtn.userInteractionEnabled = NO;        [self.captchaBtn setBackgroundImage:[UIImage imageNamed:@"back_gray"] forState:UIControlStateNormal];    }}
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