swift中UIBarButtonItem颜色不正确显示解决办法

//此方法颜色显示不正确 func setUpRightNav() { let topNav = UIBarButtonItem.init(title: "TOP", style:.Plain, target: self, action: #selector(topBtnClick)) topNav.setTitleTextAttributes([NSFontAttributeName:UIFont(name: "Verdana-BoldItalic", size: 16)!, NSForegroundColorAttributeName:UIColor.lightGrayColor()], forState: .Normal) topNav.setTitleTextAttributes([NSFontAttributeName:UIFont(name: "Verdana-BoldItalic", size: 16)!, NSForegroundColorAttributeName:UIColor.blackColor()], forState: .Selected) let newNav = UIBarButtonItem.init(title: "NEW", style:.Plain, target: self, action: #selector(newBtnClick)) newNav.setTitleTextAttributes( [NSFontAttributeName:UIFont(name: "Verdana-BoldItalic", size: 16)!, NSForegroundColorAttributeName:UIColor.lightGrayColor()], forState: .Normal) newNav.setTitleTextAttributes([NSFontAttributeName:UIFont(name: "Verdana-BoldItalic", size: 16)!, NSForegroundColorAttributeName:UIColor.blackColor()], forState: .Selected) let lineView = UIView(frame: CGRectMake(0, 0, 1, 25)) lineView.backgroundColor = UIColor.lightGrayColor() let middleNav = UIBarButtonItem.init(customView: lineView) self.navigationItem.rightBarButtonItems = [newNav,middleNav,topNav] } //解决方法 func setUpRightNav() { let newBtn = UIButton(type: .Custom) newBtn.setTitleColor(UIColor.lightGrayColor(), forState: .Normal) newBtn.setTitleColor(UIColor.redColor(), forState: .Highlighted) newBtn.setTitle("NEW", forState: .Normal) newBtn.titleLabel?.font = UIFont(name: "Verdana-BoldItalic", size: 16) newBtn.frame = CGRectMake(0, 20, 44, 30) newBtn.addTarget(self, action: #selector(newBtnClick), forControlEvents: .TouchUpInside) let newNav = UIBarButtonItem.init(customView: newBtn) let topBtn = UIButton(type: .Custom) topBtn.setTitleColor(UIColor.lightGrayColor(), forState: .Normal) topBtn.setTitleColor(UIColor.redColor(), forState: .Highlighted) topBtn.setTitle("TOP", forState: .Normal) topBtn.titleLabel?.font = UIFont(name: "Verdana-BoldItalic", size: 16) topBtn.frame = CGRectMake(0, 20, 44, 30) topBtn.addTarget(self, action: #selector(topBtnClick), forControlEvents: .TouchUpInside) let topNav = UIBarButtonItem.init(customView: topBtn) let lineView = UIView(frame: CGRectMake(0, 0, 1, 25)) lineView.backgroundColor = UIColor.lightGrayColor() let middleNav = UIBarButtonItem.init(customView: lineView) self.navigationItem.rightBarButtonItems = [newNav,middleNav,topNav] }