如何在UIBarButtonItem
上使用信息灯?
我不想使用自定义图像,因为结果不是很好。 我想使用Apple“信息”按钮。 我正在使用Swift。 谢谢。
没有直接的方法来使用UIBarButtonItem
APIs创建这样的条形按钮。
您可以使用.InfoLight
UIButton
配置的自定义视图,如here建议:
// Create the info button
let infoButton = UIButton(type: .infoLight)
// You will need to configure the target action for the button itself, not the bar button itemr
infoButton.addTarget(self, action: #selector(getInfoAction), for: .touchUpInside)
// Create a bar button item using the info button as its custom view
let infoBarButtonItem = UIBarButtonItem(customView: infoButton)
// Use it as required
navigationItem.rightBarButtonItem = infoBarButtonItem
如果您需要更多帮助,请随时发表评论。
我会这样轻松地重复使用:
class InfoBarButtonItem: UIBarButtonItem {
init(_ type: UIButtonType = .infoLight, target: Any, action: Selector) {
super.init()
let button = UIButton(type: type)
button.addTarget(target, action: action, for: UIControlEvents.touchUpInside)
self.customView = button
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
然后你可以像这样使用:
navigationItem.rightBarButtonItem =
InfoBarButtonItem(.infoLight, target: self, action: #selector(anAction(_:)))
改编mokagio对Obj-C的出色答案:
UIButton* infoButton = [UIButton buttonWithType:UIButtonTypeInfoLight];
[infoButton addTarget:self action:@selector(getInfoAction:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem* infoBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:infoButton];
self.navigationItem.rightBarButtonItem = infoBarButtonItem;
Swift 4,iOS 12,Xcode 10
另一种方法:
1)将条形按钮项从对象菜单拖到导航栏。
2)控制从barButtonItem拖动到视图控制器以创建插座。
3)在viewDidLoad中,您可以如下指定UIButton.customView。
let infoButton = UIButton(type: .infoLight)
infoButton.addTarget(self, action: #selector(infoAction), for: .touchUpInside)
infoBarButtonOutlet.customView = infoButton
//where infoBarButtonOutlet is the outlet you created in step 2.
// Be sure to add @objc before func when you create your function.
// for example:
@objc func infoAction () {
}
您可以在Interface Builder中执行此操作,如下所示: