ios – 如何在UINavigationBar中水平放置backIndicatorImage

我使用此代码将insets添加到navigaiton栏的BACkInDicator图像.但是,这仅适用于图像的垂直定位.
我只能将图像向上或向下移动,但不能向左或向右移动.
看起来左/右插图不起作用.我不确定可能是什么问题.

UIEdgeInsets insets = UIEdgeInsetsmake(0,20,0); //(20,0) works fine
 UIImage *BACkArrowImage = [[UIImage imagenamed:@"BACk"] imageWithAlignmentRecTinsets:insets];

 [[UINavigationBar appearance] setBACkInDicatorImage:BACkArrowImage];
 [[UINavigationBar appearance] setBACkInDicatorTransitionMaskImage:BACkArrowImage];

我也试过这个：

UIImage * BACkArrowImage =[[UIImage imagenamed:@"BACk"]resizableImageWithCapInsets:UIEdgeInsetsmake(0,0) resizingMode:UIImageResizingModeStretch];

如果这不可能,我是否需要返回添加自定义后退按钮？

UIImage *arrow = [UIImage imagenamed:@"BACk_Normal"];
UIGraphicsBeginImageContextWithOptions(CGSizeMake(arrow.size.width+10,arrow.size.height),NO,0); // move the pic by 10,change it to the num you want
[arrow drawAtPoint:CGPointMake(10,0)];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();