adImgView懒加载方法，没设置contentmode

[ghost]

-(UIImageView *)adImgView
{
    if(_adImgView==nil)
    {
        _adImgView = [[UIImageView alloc] initWithFrame:_adFrame];
        _adImgView.userInteractionEnabled = YES;
        _adImgView.alpha = 0.2;
        _adImgView.contentMode = UIViewContentModeScaleAspectFill;  // -->newly
        _adImgView.clipsToBounds = YES;  // -->newly
        UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
        [_adImgView addGestureRecognizer:tap];
    }
    return _adImgView;
}

当然，这不算是什么issue哈，只是个人比较习惯这样，不然某些图片被缩放变形了，看着怪怪的