从 swift 中的发件人获取 UIImage

Question

我在 table 单元格中有一个 UIImageView，我向它添加了一个 tapGesture。我想在 handleTap 方法中访问 UIImageView。

这是 TableCell 中图像的代码：

func setImageForCell(cell:ImageCell, indexPath:NSIndexPath) {
    var image : UIImage = UIImage(named: "brunnen1")!

    cell.customImageView.userInteractionEnabled = true
    cell.imageView!.tag = indexPath.row;
    var tapGestureRecognizer = UITapGestureRecognizer(target:self, action:Selector("handleTap:"))
    tapGestureRecognizer.numberOfTapsRequired = 1;
    cell.customImageView.addGestureRecognizer(tapGestureRecognizer)
    cell.customImageView.image = image
}


func handleTap(sender : UIView) {
    // get the UIImageview from the sender, i guess ?

}

我想我必须从 UIView 投射它？

Answer 1

试试这个代码。

func handleTap(sender : UITapGestureRecognizer) {
    let imgView = sender.view as! UIImageView
    // Do something.
}

由于您使用了手势识别器，handleTap 的发件人将是 UITapGestureRecognizer。手势识别器有你想要的

var view: UIView? { get } // the view the gesture is attached to. set by adding the recognizer to a UIView using the addGestureRecognizer: method

Answer 2

不，sender 是 UITapGestureRecognizer 而不是 UIView。你应该这样做：

func handleTap(sender : UITapGestureRecognizer) {
    let imageView = sender.view as! UIImageView
}

从 swift 中的发件人获取 UIImage

get UIImage from sender in swift

casting

uitapgesturerecognizer

swift