iOS导航栏返回按钮

UIImage* image = [[UIImage imageNamed:@"返回1"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 13, 0, 5)];
//    设置backBarButtonItem的图片
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:image forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
//    设置标题位置为屏幕外面
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];