xcode Swift-设置可见的菜单控制器
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时间：2020-09-15 05:49:17 来源:igfitidea点击:
Swift- Set Visible menucontroller
提问by Massimo Negro
I'm trying to display a UimenuController but I can not view it. how can I do?
我正在尝试显示 UimenuController 但我无法查看它。我能怎么做？
let MenuController: UIMenuController = UIMenuController.sharedMenuController()
MenuController.menuVisible = true
MenuController.arrowDirection = UIMenuControllerArrowDirection.Down
MenuController.setTargetRect(CGRectMake(100, 80, 50, 50), inView: self.view)
let MenuItem_1: UIMenuItem = UIMenuItem(title: "Menu", action: "delete:")
let MenuItems: NSArray = [delete]
MenuController.menuItems = MenuItems
回答by Aleksandr Movsesyan
In order to actually have the menu to display you need to do the following:
为了实际显示菜单，您需要执行以下操作：
- Call becomeFirstResponder() before you get your sharedMenuController
- Call menu.setMenuVisible(true, animated: true) at the end
- Override the canBecomeFirstResponder function
- Override the canPerformAction function
- Write the function for the selector
- 在获得 sharedMenuController 之前调用 becomeFirstResponder()
- 最后调用 menu.setMenuVisible(true, animation: true)
- 覆盖 canBecomeFirstResponder 函数
- 覆盖 canPerformAction 函数
- 为选择器编写函数
Here is an example
这是一个例子
func someFunc() {
becomeFirstResponder()
var menu = UIMenuController.sharedMenuController()
var deleteItem = UIMenuItem(title: "Delete me", action: Selector("deleteLine"))
menu.menuItems = [deleteItem]
menu.setTargetRect(CGRectMake(100, 80, 50, 50), inView: self)
menu.setMenuVisible(true, animated: true)
}
func deleteLine() {
//Do something here
}
override func canBecomeFirstResponder() -> Bool {
return true
}
override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool {
// You need to only return true for the actions you want, otherwise you get the whole range of
// iOS actions. You can see this by just removing the if statement here.
if action == Selector("deleteLine") {
return true
}
return false
}
回答by mriaz0011
Swift 3 version code:
Swift 3 版本代码：
func someFunc() {
becomeFirstResponder()
var menu = UIMenuController.shared
var deleteItem = UIMenuItem(title: "Delete me", action: #selector(ViewController.deleteLine))
menu.menuItems = [deleteItem]
menu.setTargetRect(CGRect(x: 0.0, y: 0.0, width: 20, height: 20), in: self)
menu.setMenuVisible(true, animated: true)
}
func deleteLine() {
//Do something here
}
override var canBecomeFirstResponder: Bool {
return true
}
override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
// You need to only return true for the actions you want, otherwise you get the whole range of
// iOS actions. You can see this by just removing the if statement here.
if action == #selector(ViewController.deleteLine) {
return true
}
return false
}
回答by Murali
One more important thing is action for UIMenuItem should be implemented.
更重要的一件事是应该实现 UIMenuItem 的操作。
