防止连续点击的简单处理

 //防连点
    if (self.clickTime) {
        return;
    }
    
    self.clickTime = YES;
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        self.clickTime = NO;
    });