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カスタムUIGestureRecognizer with Swift

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SwiftでカスタムUIGestureRecognizerをつくろうとした際にハマったのでメモ

ポイント

  • Bridging-Header.h に以下を追加する
#import <UIKit/UIGestureRecognizerSubclass.h>

これ追加しないとself.state変数にアクセスしようとした際に以下のコンパイルエラーが発生する。

cannot assign to 'state' in 'self'

サンプルソース

//
//  UICustomGestureRecognizer.swift
//
//  Created by Takatomo Okitsu on 2014/12/25.
//  Copyright (c) 2014年 Takatomo Okitsu. All rights reserved.
//

import UIKit

class UICustomGestureRecognizer :UIGestureRecognizer {

    var _timeOutTimer:NSTimer?

    override func reset() {
    }

    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    }

    override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
    }

    override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
    }

    override func touchesCancelled(touches: NSSet, withEvent event: UIEvent) {
    }

    func invalidateTimer() {
        if _timeOutTimer != nil {
            _timeOutTimer?.invalidate()
            _timeOutTimer = nil;
        }
    }

    func handleTimeOut() {
        self.invalidateTimer()
        self.state = UIGestureRecognizerState.Failed
    }
}

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