Question

由于iOS 11和Xcode 9 barbuttonitems和标题不再可见。我是否正在尝试添加这样的自定义视图并不重要：

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)

或者只是标准的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

使用Xcode 9进行编译时出现此问题，因为现在UIBarButtonItem也在使用autolayput .Below是使其工作的代码。

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]];

Answer 2

更新到xCode9 IDE时遇到了同样的问题。我可以使用UINavigationBar.appearance：

来解决这个问题

    let buttonItem = UIButton.appearance(whenContainedInInstancesOf: [UINavigationBar.self])
    buttonItem.setTitleColor(.black, for: .normal)
    buttonItem.setTitleColor(.gray, for: .disabled)

Answer 3

我有同样的问题而且以上都没有修复。我所做的就是在width上设置一个titleView，一切正常！

编辑：

每个UIViewController都有一个navigationItem属性，每个navigationItem都有一个可选的titleView。

供参考：https://developer.apple.com/documentation/uikit/uinavigationitem/1624935-titleview

在我的情况下，我使用自定义titleView，我认为这是问题的原因，因为Apple更改了API以支持新的导航栏布局。

BarButtonItems和标题没有出现在iOS 11中

3 个答案: