[英]How to Implement Tap Gesture on programmatically generated UIView inside UIScrollView in Swift 5
我正在嘗試在 UIScrollView 中創建一個 UIView 位置,這兩個位置都是在 Swift 中以編程方式生成的。 在編譯時,我能夠按預期看到它們,但我無法在 UIView 上調用 Tap Gesture。 我經歷過各種相同的例子,它們都有與我所擁有的相似的東西。 我的代碼如下。 注意:我從 Autolayout 添加了一個包裝器視圖作為 Superview
override func viewDidLoad() {
super.viewDidLoad()
let mediaTapRecognizer = UITapGestureRecognizer(target: self, action: #selector( self.openMedia ) )
let slideShowWidth = self.wrapperView.bounds.width
let slideShowHeight = 225
let slideShowScrollView: UIScrollView = {
let scroll = UIScrollView()
scroll.isPagingEnabled = false
scroll.showsHorizontalScrollIndicator = false
scroll.showsVerticalScrollIndicator = false
scroll.backgroundColor = .white
scroll.frame = CGRect (x: 0, y: 0, width: self.wrapperView.bounds.width , height: CGFloat(slideShowHeight) )
scroll.contentSize = CGSize(width: slideShowWidth , height: CGFloat(slideShowHeight) )
return scroll
}()
self.wrapperView.addSubview(slideShowScrollView)
slideShowScrollView.widthAnchor.constraint(equalToConstant: self.wrapperView.bounds.width ).isActive = true
slideShowScrollView.heightAnchor.constraint(equalToConstant: CGFloat(slideShowHeight) ).isActive = true
slideShowScrollView.leadingAnchor.constraint(equalTo: self.wrapperView.leadingAnchor).isActive = true
slideShowScrollView.topAnchor.constraint(equalTo: self.wrapperView.topAnchor).isActive = true
slideShowScrollView.trailingAnchor.constraint(equalTo: self.wrapperView.trailingAnchor).isActive = true
//slideShowScrollView.bottomAnchor.constraint(equalTo: self.wrapperView.bottomAnchor).isActive = true
let placeholder:UIView = {
let view = UIView()
view.frame = CGRect (x: 0, y: 0, width: self.view.bounds.width , height: CGFloat(slideShowHeight) )
view.backgroundColor = .brown
return view
}()
//slideShowScrollView.clipsToBounds = true
slideShowScrollView.addSubview(placeholder)
placeholder.isUserInteractionEnabled = true
placeholder.addGestureRecognizer(mediaTapRecognizer)
placeholder.translatesAutoresizingMaskIntoConstraints = false
placeholder.widthAnchor.constraint(equalToConstant: self.wrapperView.bounds.width ).isActive = true
placeholder.heightAnchor.constraint(equalToConstant: CGFloat(slideShowHeight) ).isActive = true
placeholder.leadingAnchor.constraint(equalTo: slideShowScrollView.leadingAnchor).isActive = true
placeholder.topAnchor.constraint(equalTo: slideShowScrollView.topAnchor).isActive = true
placeholder.trailingAnchor.constraint(equalTo: slideShowScrollView.trailingAnchor).isActive = true
placeholder.bottomAnchor.constraint(equalTo: slideShowScrollView.bottomAnchor).isActive = true
}
@objc func openMedia(){
//print("The clicked media is \(sender)")
print("The clicked media is me")
}
對於可能有同樣問題的任何人。 問題出在手勢上下文“self”上,如這里詳細解釋的那樣https://stackoverflow.com/a/53717065/2448688通過初始化 Gesture 解決了它,如下所示
var mediaTapRecognizer : UITapGestureRecognizer {
let t = UITapGestureRecognizer(target: self, action: #selector(openMedia))
return t
}
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