我正在尝试在导航栏中的自定义视图中添加操作。我让它显示得很好,但我无法弄清楚如何添加点按动作。
我尝试在视图中添加一个按钮并在那里处理它。我已经尝试使我的导航控制器成为自定义视图的委托,我尝试在导航控制器中向视图添加轻击手势识别器。没有任何效果。非常感谢任何建议或反馈。
谢谢!
我的自定义导航控制器:
class MainNavVC: UINavigationController {
var loadStatus = LoadStatus()
override func viewDidLoad() {
super.viewDidLoad()
// load status
loadStatus.bounds = CGRect(x: -24, y: -6, width: 0, height: 0)
let loadStatusButton = UIBarButtonItem(customView: loadStatus)
self.viewControllers.last?.navigationItem.leftBarButtonItem = loadStatusButton
let tap = UITapGestureRecognizer(target: self, action: #selector(loadStatusPressed))
loadStatus.addGestureRecognizer(tap)
loadStatus.isUserInteractionEnabled = true
}
@objc func loadStatusPressed(recognizer: UIGestureRecognizer) {
print("tapped")
let alert = UIAlertController(title: "Load Status", message: "When you are under a load, you are being tracked by a shipper.", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
present(alert, animated: true, completion: nil)
}
}
我的自定义视图:
class LoadStatus: UIView {
@IBOutlet var contentView: UIView!
private func commonInit(){
Bundle.main.loadNibNamed("LoadStatus", owner: self, options: nil)
addSubview(contentView)
}
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder aDecoder: NSCoder ) {
super.init(coder: aDecoder)
commonInit()
}
}
答案 0 :(得分:1)
为UIBarButtonItem
添加点击手势识别器似乎有点奇怪,默认情况下,在创建新的UIBarButtonItem
时,编程方式如您的代码段所示,使用init(barButtonSystemItem:target:action:)
,您可以为条形按钮添加所需的操作,例如:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// like this:
let loadStatusButton = UIBarButtonItem(title: "Button Title", style: .plain, target: self, action: #selector(loadStatusPressed))
// ...
}
@objc func loadStatusPressed() {
print("tapped")
let alert = UIAlertController(title: "Load Status", message: "When you are under a load, you are being tracked by a shipper.", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
present(alert, animated: true, completion: nil)
}
}
为了设置自定义视图,您只需添加:
loadStatusButton.customView = loadStatus
因此,无需为条形按钮添加点按手势。
答案 1 :(得分:1)
从iOS11开始,您需要为自定义视图提供宽度和高度约束,例如:
loadStatus.widthAnchor.constraint(equalToConstant: 44).isActive = true
loadStatus.heightAnchor.constraint(equalToConstant: 44).isActive = true
否则您的自定义视图可能是可见的,但内部为零。这是一个错误。
(我假设UINavigationController现在(iOS11 +)基于约束而不是之前!?)