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karambirov/UIControl+onTouchUpInside.swift

Created June 15, 2022 05:18
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Revisions

  1. karambirov created this gist Jun 15, 2022.
    49 changes: 49 additions & 0 deletions UIControl+onTouchUpInside.swift
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,49 @@
    import UIKit

    public extension UIControl {

    typealias OnTouchUpInside = () -> Void

    private struct Constants {
    static var callbackKey = "UIControl.OnTouchUpInsideAssociatedKey"
    }

    @objc
    var onTouchUpInside: OnTouchUpInside? {
    get {
    if let savedObject = objc_getAssociatedObject(self, &Constants.callbackKey) as? WrappedValue {
    return savedObject.block
    }
    return nil
    }
    set {
    let kSelector = #selector(UIControl._uicontrol_plus_touch_up_inside_block_handler)

    removeTarget(self, action: kSelector, for: .touchUpInside)
    if newValue != nil {
    addTarget(self, action: kSelector, for: .touchUpInside)
    }
    objc_setAssociatedObject(self,
    &Constants.callbackKey,
    WrappedValue(newValue),
    objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
    }
    }

    @objc private func _uicontrol_plus_touch_up_inside_block_handler() {
    gtuOnTouchUpInside?()
    }

    private class WrappedValue: NSObject {

    let block: OnTouchUpInside

    init?(_ block: OnTouchUpInside?) {
    guard let block = block else {
    return nil
    }
    self.block = block
    super.init()
    }
    }
    }