Question

有人可以帮我在icarousel中为中心图像添加双击识别器吗？在下面的快速代码中，您可以看到识别器已编程，但它会在屏幕上的任何位置作出反应，而不仅仅是在中心图像上。我想我必须将手势连接到newView但我尝试了几件事，但没有解决问题。在Objective-C中有很多例子，但是Swift很难在论坛上找到解决方案。希望有人能告诉我如何正确编码。

import UIKit

let image0 = UIImage(named: "Afrojack")
let image1 = UIImage(named: "Calvin Harris")
let image2 = UIImage(named: "Martin Garrix")

var imageArray = [image0, image1, image2]


class ViewController: UIViewController, iCarouselDataSource, iCarouselDelegate
{
var items: [Int] = []

@IBOutlet weak var carousel: iCarousel!

override func awakeFromNib()
{
    super.awakeFromNib()
    for i in 0...2
    {
        items.append(i)
    }
}

override func viewDidLoad()
{
    super.viewDidLoad()
    carousel.type = .CoverFlow2
}


//show message when screen is tapped twice
func message(){
    let alertView = UIAlertView(title: "Oops!", message: "Something happened...", delegate: nil, cancelButtonTitle: "OK")
    alertView.show()
}


func numberOfItemsInCarousel(carousel: iCarousel!) -> Int
{
    return items.count
}


@objc func carousel(carousel: iCarousel!, viewForItemAtIndex index: Int, reusingView view: UIView!) -> UIView! {
    var newView = view
    var label: UILabel! = nil

    if newView == nil {
        //create new view

        //don't do anything specific to the index within
        //this `if (view == nil) {...}` statement because the view will be
        //recycled and used with other index values later
        newView = UIImageView(frame:CGRectMake(0, 0, 200, 200))
        //(newView as! UIImageView).image = UIImage(named: "page")
        newView.contentMode = .Center

        // set label properties
        label = UILabel(frame:newView.bounds)
        label.backgroundColor = UIColor.clearColor()
        label.textAlignment = .Center
        label.font = label.font.fontWithSize(50)
        label.tag = 1
        newView.addSubview(label)
    }
    else
    {
        //get a reference to the label in the recycled view
        label = newView.viewWithTag(1) as! UILabel!
    }

    //set item label
    //remember to always set any properties of your carousel item
    //views outside of the `if (view == nil) {...}` check otherwise
    //you'll get weird issues with carousel item content appearing
    //in the wrong place in the carousel

    //label.text = "\(items[index])"

    (newView as! UIImageView).image = imageArray[items[index]]

    newView.userInteractionEnabled = true

    let tapGesture = UITapGestureRecognizer(target: self , action: "message")
    tapGesture.numberOfTapsRequired = 2
    newView.addGestureRecognizer(tapGesture)

    return newView
}
}


func carousel(carousel: iCarousel!, valueForOption option: iCarouselOption, withDefault value: CGFloat) -> CGFloat
{

    if (option == .Spacing)
    {
        return value * 1.1
    }

    return value

}

Answer 1

您是否尝试将此代码置于newView初始化之下？

let tapGesture = UITapGestureRecognizer(target: self , action: "message")
tapGesture.numberOfTapsRequired = 2
newView.addGestureRecognizer(tapGesture)

您还应该在viewDidLoad()。

中删除该手势

修改

你应该在 newView之后将识别器设置为100％而不是nil，原因是现在，newView可以是nil（你有{ {1}}）所以放在所有if newView == nil语句下面。它应该工作。

如何将UIGestureRecognizer附加到icarousel swift代码中的项目视图

1 个答案: