ios - 无法将 UITapGestureRecognizer 和 UILongPressGestureRecognizer 添加到 UIButton

Question

我正在使用以下代码片段来添加手势识别器:

let tapGesture = UITapGestureRecognizer(target: self, action: #selector(attachImage))
    let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(longPress))
    tapGesture.numberOfTapsRequired = 1
    cell.image.addGestureRecognizer(tapGesture)
    cell.image.addGestureRecognizer(longGesture)

@objc func longPress(_ btn : UIButton) {
        selectedImageIndex = btn.tag
    }
@objc func attachImage(_ btn : UIButton) {
        selectedImageIndex = btn.tag
    }

当我按下按钮时出现以下错误

unrecognized selector sent to instance 0x2802ec000

Answer 1

修改函数如下

@objc func longPress(_ sender : UILongPressGestureRecognizer) {
    if let btn = sender.view {
        selectedImageIndex = btn.tag
    }
}
@objc func attachImage(_ sender : UITapGestureRecognizer) {
    if let btn = sender.view {
        selectedImageIndex = btn.tag
    }
}

并且改变手势初始化如下

let tapGesture = UITapGestureRecognizer(target: self, action: #selector(attachImage(_:)))
let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(longPress(_:)))