1.首先在Appdelegate的启动方法里设置
UIImage *backButtonImage = [[UIImage imageNamed:@"fanhui"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
[[UINavigationBar appearance] setBackIndicatorImage:backButtonImage];
[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:backButtonImage];
这样会替换系统原来的返回按钮图片。
2.将文字设置一定的偏移量
//iOS11之后
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(-200, 0)
forBarMetrics:UIBarMetricsDefault];
//iOS11之前
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
forBarMetrics:UIBarMetricsDefault];
