if #available(iOS 11, *) {
dateItem.setTitleTextAttributes([.foregroundColor: UIColor.black], for: .disabled)
}
else {
dateItem.setTitleTextAttributes([.foregroundColor: UIColor.black], for: .normal)
dateItem.setTitleTextAttributes([.foregroundColor: UIColor.black], for: .disabled)
}
dateItem.isEnabled = false
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本文标题：设置 UIBarButtonItem Disable 状态下的颜
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