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我有一个带有五个以上标签的标签栏应用程序,这意味着有一个“更多”部分。我在更多部分有一个自定义背景,但我一生无法弄清楚如何将“编辑”按钮和“后退”按钮的颜色从其他视图更改为黑色。我假设这将在 appDelegate 文件中?