uibarbuttonitem - BarButtonItems 和标题未出现在 iOS 11 中

Question

自 iOS 11 和 Xcode 9 以来，栏按钮项和标题不再可见。我是否尝试添加这样的自定义 View 并不重要:

let backButton = UIButton.init(frame: CGRect(x: 0, y: 0, width: 180, height: 32))
        backButton.setImage(UIImage(named: "back_icon")?.withRenderingMode(.alwaysTemplate), for: .normal)
        backButton.tintColor = UIColor.white
        backButton.addTarget(self, action: #selector(backAction), for: .touchUpInside)
        backButton.backgroundColor = UIColor.clear
        backButton.titleLabel?.font = UIFont(name: SWMainHelper.sharedInstance.mediumFont, size: 18)
        backButton.setTitleColor(UIColor.white, for: .normal)
        backButton.setTitle("Go back", for: .normal)

        backButton.sizeToFit()

        backButton.titleEdgeInsets = UIEdgeInsets(top: 0, left: 16, bottom: 0, right: 0)

        backButton.frame.size.width += 16

        let negativeButtonSpace = UIBarButtonItem(barButtonSystemItem: .fixedSpace, target: nil, action: nil)
        negativeButtonSpace.width = -16

        self.navigationItem.setLeftBarButtonItems([negativeButtonSpace, UIBarButtonItem(customView: backButton)], animated: true)

或者像这样的标准 UIBarButtonItems:

let add = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addTapped))
        add.tintColor = UIColor.white
        let play = UIBarButtonItem(title: "Play", style: .plain, target: self, action: #selector(playTapped))
        play.tintColor = UIColor.white
        navigationItem.rightBarButtonItems = [add, play]

使用 Xcode 8 一切正常。

Answer 1

这个问题是在使用 Xcode 9 编译时出现的，因为现在 UIBarButtonItem 也在使用 autolayput。下面是让它工作的代码。

UIButton *leftCustomButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 35, 100)];

        [leftCustomButton.widthAnchor constraintEqualToConstant:100].active = YES;
        [leftCustomButton.heightAnchor constraintEqualToConstant:35].active = YES;
        [leftCustomButton setTitle:@"TEST" forState:UIControlStateNormal];
        [leftCustomButton.titleLabel setFont:[UIFont boldSystemFontOfSize:16.0]];
        [leftCustomButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        UIBarButtonItem * leftButtonItem =[[UIBarButtonItem alloc] initWithCustomView:leftCustomButton];        
        [self.navigationItem setRightBarButtonItems:@[leftButtonItem]];