1.UIBarButtonItem 自定義問題
描述：當(dāng)UIBarButtonItem的customView為UIImageView時吏饿，imageView多次setImage后爱咬，圖片回被拉伸
解決方法：
TWView *rightView = [[TWView alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];
[rightView addSubview:imageView];
UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:rightView];
2.關(guān)于UIBarButtonItem的間距
ios11中已經(jīng)留了默認間距
以上問題是在Xcode9.0Run后發(fā)現(xiàn)的兼容問題
