访问“<>”符号内的值

Question

我有一个如下所示的手势识别器：

@objc func handleTap(_ sender: UITapGestureRecognizer) {
    var currentImage = sender.view
    print(currentImage)

}

然后打印出来：

Optional(<UIImageView: 0x7ff72601ddd0; frame = (0 0; 414 414); opaque = NO; gestureRecognizers = <NSArray: 0x600000b541e0>; layer = <CALayer: 0x6000005be0c0>>)

如何在 sender.view 中获取 UIImageView 的值？

P.S.

调用点击识别器的代码如下所示：

var tap = UITapGestureRecognizer()

override func viewDidLoad() {
    super.viewDidLoad()

    tap = UITapGestureRecognizer(target: self, action: #selector(ViewController.handleTap(_:)))
    tap.numberOfTapsRequired = 1
    tap.numberOfTouchesRequired = 1

    imageView.addGestureRecognizer(tap)
    imageView.isUserInteractionEnabled = true
}

Answer 1

您可以使用

if let  currentImage = sender.view as? UIImageView {

}

或者如果 100% 确定就直接

let  currentImage = sender.view as! UIImageView

或

guard let currentImage = sender.view as? UIImageView else { return }
/// then use unwrapped currentImage

访问“<>”符号内的值

Access values within '<>' sign

ios

swift

uiimageview

uitapgesturerecognizer