[UINavigation]设置 UINavigationBar

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UINavigationBar * navigationBar = [UINavigationBar appearance];
UIImage *image = [UIImage imageNamed:imageName];
image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
navigationBar.backIndicatorImage = image;
navigationBar.backIndicatorTransitionMaskImage = image;

imageName 是图片的名称