直播带货源码，图片左上角或右上角点击返回按钮实现的相关代码

        [btn_off setImage:[UIImage imageNamed:@"hifi_off"] forState:(UIControlStateNormal)];
        [btn_off addTarget:self action:@selector(bgAction) forControlEvents:(UIControlEventTouchUpInside)];
        btn_off.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        btn_off.contentVerticalAlignment = UIControlContentVerticalAlignmentBottom;
        btn_off.backgroundColor = UIColor.greenColor;
        [contentView addSubview:btn_off];
其中   btn_off.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;  为图片居左
btn_off.contentVerticalAlignment = UIControlContentVerticalAlignmentBottom; 为图片置底

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