如何使用向右滑动手势执行转场操作

Question

我想通过向右滑动手势来执行一个segue。

最佳实践是什么？

- Andrew Harris

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如果您只想在用户从屏幕边缘滑动时发生segue，请查看UIScreenEdgePanGestureRecognizer。 - Daniel Storm

Answer 1

我正在使用一个自定义segue和一个滑动手势识别器来实现一个“从左向右滑动”的segue。

你需要创建一个新的.swift文件，并将segue作为类在界面生成器属性中使用。

//  Created by David Seek on 25.04.16.
//  Copyright © 2016 David Seek. All rights reserved.
//

import UIKit

class FromLeftToRightSegue: UIStoryboardSegue {
    override func perform() {

        let firstVC = self.sourceViewController.view as UIView!
        let secondVC = self.destinationViewController.view as UIView!

        let screenWidth = UIScreen.mainScreen().bounds.size.width
        let screenHeight = UIScreen.mainScreen().bounds.size.height


        secondVC.frame = CGRectMake(-screenWidth, 0, screenWidth, screenHeight)

        let window = UIApplication.sharedApplication().keyWindow
        window?.insertSubview(secondVC, aboveSubview: firstVC)

        // Animate the transition.
        UIView.animateWithDuration(0.3, animations: { () -> Void in // set animation duration

            firstVC.frame = CGRectOffset(firstVC.frame, 0.0, 0.0) // old screen stay

            secondVC.frame = CGRectOffset(secondVC.frame, screenWidth, 0.0) // new screen strave from left to right

        }) { (Finished) -> Void in
            self.sourceViewController.presentViewController(self.destinationViewController as UIViewController,
                                                            animated: false,
                                                            completion: nil)
        }
    }

}

滑动手势识别器也需要输入到一个新的.swift文件中：

import Foundation
import UIKit

//
//  UISwipeGestureRecognizer.h
//  UIKit
//
//  Copyright (c) 2009-2015 Apple Inc. All rights reserved.
//

// Recognizes: when numberOfTouchesRequired have moved mostly in the specified direction, enough to be considered a swipe.
//             a slow swipe requires high directional precision but a small distance
//             a fast swipe requires low directional precision but a large distance

// Touch Location Behaviors:
//     locationInView:         location where the swipe began. this is the centroid if more than one touch was involved
//     locationOfTouch:inView: location of a particular touch when the swipe began

public struct UISwipeGestureRecognizerDirection : OptionSetType {
    public init(rawValue: UInt)

    public static var Right: UISwipeGestureRecognizerDirection { get }
    public static var Left: UISwipeGestureRecognizerDirection { get }
    public static var Up: UISwipeGestureRecognizerDirection { get }
    public static var Down: UISwipeGestureRecognizerDirection { get }
}

@available(iOS 3.2, *)
public class UISwipeGestureRecognizer : UIGestureRecognizer {

    public var numberOfTouchesRequired: Int // default is 1. the number of fingers that must swipe
    public var direction: UISwipeGestureRecognizerDirection // default is UISwipeGestureRecognizerDirectionRight. the desired direction of the swipe. multiple directions may be specified if they will result in the same behavior (for example, UITableView swipe delete)
}

在您所需的ViewController.swift中调用：

private var swipeGestureRecognizer: UISwipeGestureRecognizer?

override func viewDidLoad() {
    super.viewDidLoad()
    swipeGestureRecognizer = MySwipeGestureRecognizer(target: self, swipeLeftSegue: "yourSwipeLeftSegue", swipeRightSeque: "yourSwipeRightSegue")
        view.addGestureRecognizer(swipeGestureRecognizer!)
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "yourSwipeLeftSegue" {
        //your code goes here
    }
}

希望这对你有帮助，如果您有任何问题，请让我知道。

- David Seek

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哇，是的，这正是我正在寻找的，谢谢你的帮助 :) - Andrew Harris