如何在iOS中的导航栏中添加标准信息按钮？

Question

我想在导航栏中添加一个带有系统信息图标的右侧栏按钮。但我看到UIBarButtonSystemItem没有提供这种类型的按钮。另一方面，所以我尝试使用UIButton类型的UIButtonType.infoLight，但我不允许将它分配给navigationItem.rightBarButtonItems。

有没有办法做到这一点？

Answer 1

这可以使用UIButton类型的.infoLight对象来实现

let infoButton = UIButton(type: .infoLight)
infoButton.addTarget(self, action: #selector(infoButtonTapped), forControlEvents: .TouchUpInside)
let barButton = UIBarButtonItem(customView: infoButton)
self.navigationItem.rightBarButtonItem = barButton

或者：

将infoImage添加到你的Asset catalog并使用下面的代码创建barButtonItem

let infoButton = UIBarButtonItem(image: UIImage(named: "infoImage"), style: .Plain, target: self, action: #selector(ViewController.infoButtonTapped))
self.navigationItem.rightBarButtonItem = infoButton 

Answer 2

您可以使用自定义视图初始化UIBarButtonItem：

let button = UIButton(type: .infoLight)
let barButton = UIBarButtonItem(customView: button)

Answer 3

我找到了一种使用Interface Builder将信息图标添加到导航栏的更简单方法。

1. 不要将栏按钮项添加到导航栏
2. 向UIView添加一个按钮
3. 将按钮类型更改为Info Light
4. 将按钮拖放到导航栏的右上角。这是全部了。条形按钮项目将自动出现，添加的信息按钮将位于条形按钮项目下（然后，像往常一样对按钮执行操作）

Answer 4

Swift 5.0

override func viewDidLoad() {
    super.viewDidLoad()

    let infoButton = UIButton(type: .infoLight)
    infoButton.addTarget(self, action: #selector(infoButtonTapped), for: .touchUpInside)
    navigationItem.rightBarButtonItem = UIBarButtonItem(customView: infoButton)
}

@objc func infoButtonTapped() {}

Answer 5

UIButton *doneBtn = [[UIButton alloc] initWithFrame...];
[doneBtn setTitle:@"Submit" forState:UIControlStateNormal];
doneBtn.titleLabel.font = [UIFont systemFontOfSize: 14.0];
[doneBtn addTarget:self action:@selector(doSubmit:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithCustomView:doneBtn];
self.navigationItem.rightBarButtonItem = rightButton;

Answer 6

将infoButton图像添加到资源中，并通过提供名称将其设置为barButton。

UIBarButtonItem *item = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"infoImage.png"] style:UIBarButtonItemStyleDone target:self action:@selector(barButtonAction)];

    self.navigationItem.rightBarButtonItem = item;

在斯威夫特

  let item = UIBarButtonItem(image: UIImage(named: "infoImage.png"), style: .Plain, target: self, action: #selector(barButtonAction))

        self.navigationItem.rightBarButtonItem = item