block使用时不判空，当使用的block没有实现，会crash。

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    self.backgroundColor = [UIColor whiteColor];
    if (self) {
        for (int i = 0; i<3; i++) {
            
            ImageTitleButton *btn = [[ImageTitleButton alloc]initWithType:ImageTopTitleBottom andTitleFont:NFont(13) andTitle:@[@"好友",@"关注",@"粉丝"][i] andImage:[UIImage imageNamed:@[@"friends",@"follow",@"fans"][i]] andFrame:CGRectMake(0, 0, PPImageTitleBtnW, PPImageTitleBtnH)];
 
//                if(self.clickAction)
                {
                    self.clickAction(button.titleButton.titleLabel.text,button);
                } 
            }];
            if (i == 0) {
            }
        }        
        [self upFrame];
    }
    return self;
}