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我試圖啓用在UITextView中激活的自定義UIMenuController。在我viewDidLoad中（）我有以下代碼：UIMenuController不顯示在textView中
override func viewDidLoad() {
super.viewDidLoad()
self.noteTextView.delegate = self
let tapGesture = UITapGestureRecognizer.init(target: self, action: #selector(enableCustomMenuControllerAtTap(_:)))
self.noteTextView.addGestureRecognizer(tapGesture)
}
處理該手勢的方法是：
func enableCustomMenuControllerAtTap(_ gesture: UITapGestureRecognizer) {
print("tap")
view.becomeFirstResponder()
let OP1MenuController: UIMenuController
OP1MenuController = UIMenuController.shared
let font = UIMenuItem(title: "Font", action: #selector(pickFont))
let color = UIMenuItem(title: "Color", action: #selector(pickColor))
OP1MenuController.menuItems = [font, color]
let point = gesture.location(in: view)
OP1MenuController.setTargetRect(CGRect(x: point.x, y: point.y, width: 200, height: 200), in: view)
OP1MenuController.arrowDirection = UIMenuControllerArrowDirection.down
OP1MenuController.setMenuVisible(true, animated: true)
}
接下來，我實現了這些方法，我在很多導遊都看到：
func pickFont(sender: UIMenuItem) {
}
func pickColor(sender: UIMenuItem) {
}
override var canBecomeFirstResponder: Bool {
return true
}
override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
if action == Selector(("pickFont")) || action == Selector(("pickColor"))
{
if (noteTextView.selectedRange.length > 0) {
return true
}
}
return false
}
有人能告訴我爲什麼菜單不顯示？任何幫助將非常感激。