统一修改 UINavigationBar backItem

{

UINavigationBar * navigationBar = [UINavigationBar appearance];

//返回按钮的箭头颜色

[navigationBar setTintColor:[UIColor whiteColor]];

//设置返回样式图片

UIImage *image = [UIImage imageNamed:@"backArrow"];

image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

navigationBar.backIndicatorImage = image;

navigationBar.backIndicatorTransitionMaskImage = image;

UIBarButtonItem *buttonItem = [UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil];

UIOffset offset;

offset.horizontal = -500;

[buttonItem setBackButtonTitlePositionAdjustment:offset forBarMetrics:UIBarMetricsDefault];

}

还有这里的方法

http://blog.csdn.net/zhangao0086/article/details/22432387

两个方法都不是特别的完美

后续补充