frame

// 之前设置好了frame，为了防止因为图片尺寸大于屏幕尺寸时，设置的frame失效，图片超出屏幕，需要设置self.autoresizingMask = UIViewAutoresizingNone;
- (void)awakeFromNib {
    self.autoresizingMask = UIViewAutoresizingNone;
    // 给图片添加监听器
    self.imageView.userInteractionEnabled = YES;
    [self.imageView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(showPicture)]];
}