我有大部分有效的代码
[self.disclosureButton setBezelStyle:NSDisclosureBezelStyle];
[self.disclosureButton setButtonType: NSPushOnPushOffButton];
[self.disclosureButton setTitle:nil];
[self.disclosureButton highlight:NO];
但是,当我按下按钮时,它会变成黑色以指示按下。如何让它停止改变颜色?