UIGestureRecognizer with closure

Question

I have a view in which I want to execute the right gesture. Sorry, I get an EXC_BAD_ACCESS error. Does anyone know what's wrong here? Please review the code below.

extension UIView {

    func addGestureRecognizerWithAction(nizer: UIGestureRecognizer, action:() -> ()) {

        class Invoker {
            var action:() -> ()
            init(action:() -> ()) {
                self.action = action
            }
            func invokeTarget(nizer: UIGestureRecognizer) {
                self.action()
                println("Hi from invoker")
            }
        }
        addGestureRecognizer(nizer)
        nizer.addTarget(Invoker(action), action: "invokeTarget:")
    }
}

class BugView: UIView {

    override func awakeFromNib() {
        super.awakeFromNib()

        var swipeRight = UISwipeGestureRecognizer()
        swipeRight.direction = UISwipeGestureRecognizerDirection.Right
        self.addGestureRecognizerWithAction(swipeRight) {
            println("Hi from the gesture closure")
        }
    }
}

Answer 1

Finally, true is true. In his answer above, he pointed me in the right direction, proposing to Invokersubclass NSObject.

, . , , Invoker, , . , , . , :

class UIGestureRecognizerWithClosure: NSObject {  // must subclass NSObject otherwise error: "class does not implement methodSignatureForSelector: -- " !!

    var closure:() -> ()

    init(view:UIView, nizer: UIGestureRecognizer, closure:() -> ()) {
        self.closure = closure
        super.init()
        view.addGestureRecognizer(nizer)
        nizer.addTarget(self, action: "invokeTarget:")
    }

    func invokeTarget(nizer: UIGestureRecognizer) {
        self.closure()
    }
}

, :

var swipeRight = UISwipeGestureRecognizer()
swipeRight.direction = UISwipeGestureRecognizerDirection.Right

// swipeWrapper has to be defined as a property: var swipeWrapper:UIGestureRecognizerWithClosure?
// -> this is needed in order to keep the object alive till the swipe event occurs
swipeWrapper = UIGestureRecognizerWithClosure(view: self, nizer:swipeRight) {
    println("Hi from the gesture closure")
}

Answer 2

, ClosureActionsHandler UIGestures. UIView, UIComponents. Git-link. .

import Foundation
import UIKit

private var AssociatedObjectHandle: UInt8 = 25
public enum closureActions : Int{
    case none = 0
    case tap = 1
    case swipe_left = 2
    case swipe_right = 3
    case swipe_down = 4
    case swipe_up = 5
}
public struct closure {
    typealias emptyCallback = ()->()
    static var actionDict = [Int:[closureActions : emptyCallback]]()
    static var btnActionDict = [Int:[String: emptyCallback]]()
}

public extension UIView{

var closureId:Int{
    get {
        let value = objc_getAssociatedObject(self, &AssociatedObjectHandle) as? Int ?? Int()
        return value
    }
    set {
        objc_setAssociatedObject(self, &AssociatedObjectHandle, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
    }
}
public func actionHandleBlocks(_ type : closureActions = .none,action:(() -> Void)? = nil) {

    if type == .none{
        return
    }
    var actionDict : [closureActions : closure.emptyCallback]
    if self.closureId == Int(){
        self.closureId = closure.actionDict.count + 1
        closure.actionDict[self.closureId] = [:]
    }
    if action != nil {
        actionDict = closure.actionDict[self.closureId]!
        actionDict[type] = action
        closure.actionDict[self.closureId] = actionDict
    } else {
        let valueForId = closure.actionDict[self.closureId]
        if let exe = valueForId![type]{
            exe()
        }
    }
}

@objc public func triggerTapActionHandleBlocks() {
    self.actionHandleBlocks(.tap)
}
@objc public func triggerSwipeLeftActionHandleBlocks() {
    self.actionHandleBlocks(.swipe_left)
}
@objc public func triggerSwipeRightActionHandleBlocks() {
    self.actionHandleBlocks(.swipe_right)
}
@objc public func triggerSwipeUpActionHandleBlocks() {
    self.actionHandleBlocks(.swipe_up)
}
@objc public func triggerSwipeDownActionHandleBlocks() {
    self.actionHandleBlocks(.swipe_down)
}
public func addTap(Action action:@escaping() -> Void){
    self.actionHandleBlocks(.tap,action:action)
    let gesture = UITapGestureRecognizer()
    gesture.addTarget(self, action: #selector(triggerTapActionHandleBlocks))
    self.isUserInteractionEnabled = true
    self.addGestureRecognizer(gesture)
}
public func addAction(for type: closureActions ,Action action:@escaping() -> Void){

    self.isUserInteractionEnabled = true
    self.actionHandleBlocks(type,action:action)
    switch type{
    case .none:
        return
    case .tap:
        let gesture = UITapGestureRecognizer()
        gesture.addTarget(self, action: #selector(triggerTapActionHandleBlocks))
        self.isUserInteractionEnabled = true
        self.addGestureRecognizer(gesture)
    case .swipe_left:
        let gesture = UISwipeGestureRecognizer()
        gesture.direction = UISwipeGestureRecognizerDirection.left
        gesture.addTarget(self, action: #selector(triggerSwipeLeftActionHandleBlocks))
        self.isUserInteractionEnabled = true
        self.addGestureRecognizer(gesture)
    case .swipe_right:
        let gesture = UISwipeGestureRecognizer()
        gesture.direction = UISwipeGestureRecognizerDirection.right
        gesture.addTarget(self, action: #selector(triggerSwipeRightActionHandleBlocks))
        self.isUserInteractionEnabled = true
        self.addGestureRecognizer(gesture)
    case .swipe_up:
        let gesture = UISwipeGestureRecognizer()
        gesture.direction = UISwipeGestureRecognizerDirection.up
        gesture.addTarget(self, action: #selector(triggerSwipeUpActionHandleBlocks))
        self.isUserInteractionEnabled = true
        self.addGestureRecognizer(gesture)
    case .swipe_down:
        let gesture = UISwipeGestureRecognizer()
        gesture.direction = UISwipeGestureRecognizerDirection.down
        gesture.addTarget(self, action: #selector(triggerSwipeDownActionHandleBlocks))
        self.isUserInteractionEnabled = true
        self.addGestureRecognizer(gesture)
    }


}
}

Answer 3

, , , . -. GR. - UITapGestureRecognizer , . ? .

final class BindableGestureRecognizer: UITapGestureRecognizer {
    private var action: () -> Void

    init(action: @escaping () -> Void) {
        self.action = action
        super.init(target: nil, action: nil)
        self.addTarget(self, action: #selector(execute))
    }

    @objc private func execute() {
        action()
    }
}

:

    let gestureRecognizer = BindableGestureRecognizer {
        print("It alive!")
    }
    self.view.addGestureRecognizer(gestureRecognizer)

[ ]. .

    let colorGestureRecognizer = BindableGestureRecognizer { [weak self] in
        self?.view.backgroundColor = .red
    }
    self.view.addGestureRecognizer(colorGestureRecognizer)

@objc .. ?