倒计时代码

-(void)getCodeSuccess
{
    self.codeButton.enabled = NO;
    self.number = 59;
    self.timmer = [NSTimer timerWithTimeInterval:1.0f target:self selector:@selector(changeGetCodeButtonTitle) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:self.timmer forMode:NSRunLoopCommonModes];
    [self.timmer fire];
    self.touched = NO;
}

//更换，获取验证码按钮标题
- (void)changeGetCodeButtonTitle
{
    self.codeButton.titleLabel.text = [NSString stringWithFormat:@"%d秒后重试",(self.number)];
    [self.codeButton setTitle:[NSString stringWithFormat:@"%d秒后重试",(self.number)] forState:UIControlStateDisabled];
    self.number--;
    if (self.number == 0) {
        [self.timmer invalidate];
        self.timmer = nil;
        [self.codeButton setTitle:@"重新获取" forState:UIControlStateNormal];
        self.codeButton.enabled = YES;
    }
}