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在SDPhotoGroup类中 ,使用按钮创建的子控件在显示长方形图片时,会出现图片挤压变形情况,把子控件改为imageView并设置相关属性,使之 显示图片中间部位,从而在显示长方形图片时保证不被挤压变形,影响用户体验