我们如何将 UIGestureRecognizer 添加到 Outlet Collection？

Question

我正在尝试向出口标签集合 [UILabel] 添加点击手势，如下所示：

@IBOutlet var subLabels: [UILabel]!

    override func viewDidLoad() {
            super.viewDidLoad()

            let tap = UITapGestureRecognizer(target: self, action: #selector(HomePageViewController.selectSubLabel(tap:)))
            tap.numberOfTapsRequired = 1
            tap.cancelsTouchesInView = false

            for i in (0..<(subLabels.count)) {
                subLabels[i].addGestureRecognizer(tap)
            }
    }

    func selectSubLabel(tap: UITapGestureRecognizer) {
            print("Gesture Is WORKING!")
        }

我尝试将它添加到情节提要中的单个标签上；但是 NONE 正在工作。

Answer 1

请在 Xcode 的 Attribute inspector 中检查 UIlabel 的 User Interaction Enabled 属性。 User Interaction Enabled 必须勾选检测点击。请看下图，

Answer 2

首先，您需要允许用户在标签上进行交互（默认情况下处于关闭状态）：

for i in (0..<(subLabels.count)) {
    subLabels[i].isUserInteractionEnabled = true
    subLabels[i].addGestureRecognizer(tap)
}

但手势识别器只能在一个视图中观察手势。所以，有两个选择：

我。每个标签的专用手势识别器

for i in (0..<(labels.count)) {
    let tap = UITapGestureRecognizer(target: self, action: #selector(selectSubLabel(tap:)))
    labels[i].isUserInteractionEnabled = true
    labels[i].addGestureRecognizer(tap)
}

二．标签父视图的一个手势识别器

override func viewDidLoad() {
    super.viewDidLoad()

    for i in (0..<(labels.count)) {
        subLabels[i].isUserInteractionEnabled = true
    }

    let tap = UITapGestureRecognizer(target: self, action: #selector(selectSubLabel(tap:)))
    view.addGestureRecognizer(tap)
}

func selectSubLabel(tap: UITapGestureRecognizer) {
    let touchPoint = tap.location(in: view)
    guard let label = subLabels.first(where: { [=12=].frame.contains(touchPoint) }) else { return }

    // Do your stuff with the label
}

我们如何将 UIGestureRecognizer 添加到 Outlet Collection？

How can we add a UIGestureRecognizer to Outlet Collection?

ios

swift3

uilabel

uitapgesturerecognizer

iboutletcollection