UITapGestureRecognizer 将坐标添加到数组

Question

我在 ScrollView 里面有一个 ImageView。每次用户单击图像上的一个点时，都会设置一个图钉并打印出 coordinates。

但是，我试图在一个数组中存储多个 coordinates。用户点击图像的前 3 次，我需要将坐标存储在 refs1 中。 spots1.

里面接下来的 14-20 次

// MARK: - Outlets
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var sharkImage: UIImageView!

// MARK: - Properties
var refs1 :[Double] = []
var spots1 :[Double] = []

// MARK: - View Did Load
override func viewDidLoad() {
    super.viewDidLoad()

    scrollView.minimumZoomScale = 1.0
    scrollView.maximumZoomScale = 6.0

    scrollView.delegate = self

    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(tapAction))

    self.sharkImage.isUserInteractionEnabled = true
    self.sharkImage.addGestureRecognizer(tapGestureRecognizer)
}

// MARK: - Scroll View
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
    return sharkImage
}

// MARK: - Functions
func tapAction(sender: UITapGestureRecognizer) {
    // Get points for the UIImageView
    let touchPoint = sender.location(in: self.sharkImage)
    print(touchPoint)

    // Add pin to tap
    let pin = UIImageView(frame: CGRect(x: touchPoint.x - 5, y: touchPoint.y - 5, width:10, height:10))
    pin.image = UIImage(named: "photo-pin-red")
    sharkImage.addSubview(pin)

}

Answer 1

使用计数器变量：

var count = 0
func tapAction(sender: UITapGestureRecognizer) {
    count = conut + 1
    // Check for count
    if (count >= 14) {
        // Do stuff
    }
    // Get points for the UIImageView
    let touchPoint = sender.location(in: self.sharkImage)
    print(touchPoint)

    // Add pin to tap
    let pin = UIImageView(frame: CGRect(x: touchPoint.x - 5, y: touchPoint.y - 5, width:10, height:10))
    pin.image = UIImage(named: "photo-pin-red")
    sharkImage.addSubview(pin)

}

Answer 2

首先，如果你想，你可以将坐标存储在 2D array 中：

var refs1 :[[Double]] = []
var spots1 :[[Double]] = []

然后存储一个名为计数器的全局变量来跟踪点击次数：

var counter = 0

然后在您的 tapAction 中执行以下操作（请参阅评论了解说明）：

func tapAction(sender: UITapGestureRecognizer) {
    // increase counter with +1 for each click
    counter += 1

    if counter <= 3 { // first 3
        refs1.append([Double(touchPoint.x), Double(touchPoint.y)])
    } else if counter <= 23 { // next 14 - 20 clicks
        counter = 0 // reset counter to start over again
        spots1.append([Double(touchPoint.x), Double(touchPoint.y)])
    }
}

UITapGestureRecognizer 将坐标添加到数组

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