[英]How to add a standard info button to a navigation bar in iOS?
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。 但我发现UIBarButtonSystemItem
不提供这种类型的按钮。 另一方面,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?
这可以使用.infoLight
类型的UIButton
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:
通过将infoImage
添加到您的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
您可以使用自定义视图初始化UIBarButtonItem
:
let button = UIButton(type: .infoLight)
let barButton = UIBarButtonItem(customView: button)
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() {}
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。
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
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;
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