Question

我正在为我的swift应用创建一个注册页面，其中包含一个允许用户选择个人资料图片的按钮，该图片应该替换占位符＆＃34;添加图片＆＃34;按钮一旦用户选择了它，使用button.setImage（）和新选择的图片。我的问题是，当用户选择图片时，它在屏幕上水平拉伸，而不是约束到按钮的150x150宽度和高度。

这是我的按钮：

let plusPhotoButton : UIButton = {
    let b = UIButton(type: .system)
    b.imageView?.clipsToBounds = true
    b.setImage(#imageLiteral(resourceName: "plus_photo").withRenderingMode(.alwaysOriginal), for: .normal)
    b.addTarget(self, action: #selector(setProfilePic), for: .touchUpInside)
    return b
}()

我将它添加到视图中：

fileprivate func setupPlusPhotoButton() {
    view.addSubview(plusPhotoButton)
    plusPhotoButton.anchor(top: view.topAnchor, paddingTop: 50, left: nil, paddingLeft: 0, right: nil, paddingRight: 0, bottom: nil, paddingBottom: 0, width: 150, height: 150)
    plusPhotoButton.anchorCenter(x: view.centerXAnchor, y: nil)
}

使用此UIView扩展程序可以更轻松地进行锚定：

extension UIView {
func anchor(top: NSLayoutYAxisAnchor?, paddingTop: CGFloat, left: NSLayoutXAxisAnchor?, paddingLeft: CGFloat, right: NSLayoutXAxisAnchor?, paddingRight: CGFloat, bottom: NSLayoutYAxisAnchor?, paddingBottom: CGFloat, width: CGFloat, height: CGFloat) {

    self.translatesAutoresizingMaskIntoConstraints = false

    if let top = top {
        self.topAnchor.constraint(equalTo: top, constant: paddingTop).isActive = true
    }
    if let left = left {
        self.leftAnchor.constraint(equalTo: left, constant: paddingLeft).isActive = true
    }
    if let right = right {
        self.rightAnchor.constraint(equalTo: right, constant: -paddingRight).isActive = true
    }
    if let bottom = bottom {
        self.bottomAnchor.constraint(equalTo: bottom, constant: paddingBottom).isActive = true
    }
    if width != 0 {
        self.widthAnchor.constraint(equalToConstant: width)
    }
    if height != 0 {
        self.heightAnchor.constraint(equalToConstant: height).isActive = true
    }
}

func anchorCenter(x: NSLayoutXAxisAnchor?, y: NSLayoutYAxisAnchor?) {
    self.translatesAutoresizingMaskIntoConstraints = false
    if let x = x {
        self.centerXAnchor.constraint(equalTo: x).isActive = true
    }
    if let y = y {
        self.centerYAnchor.constraint(equalTo: y).isActive = true
    }
}

}

我像这样展示我的UIImagePickerController：

func setProfilePic() {
    print("setting profile picture")
    let imagePickerVC = UIImagePickerController()
    imagePickerVC.delegate = self
    imagePickerVC.allowsEditing = true
    present(imagePickerVC, animated: true, completion: nil)
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

    if let editedImage = info["UIImagePickerControllerEditedImage"] as? UIImage {
        plusPhotoButton.setImage(editedImage.withRenderingMode(.alwaysOriginal), for: .normal)
    } else if let originalImage = info["UIImagePickerControllerOriginalImage"] as? UIImage {
        plusPhotoButton.setImage(originalImage.withRenderingMode(.alwaysOriginal), for: .normal)
    }

    plusPhotoButton.layer.cornerRadius = plusPhotoButton.frame.width/2
    plusPhotoButton.layer.masksToBounds = true
    plusPhotoButton.layer.borderColor = UIColor.black.cgColor
    plusPhotoButton.layer.borderWidth = 3

    dismiss(animated: true, completion: nil)
}

感谢所有的帮助，谢谢！

Answer 1

没关系 - 只是检查了我的扩展，并没有将我的宽度约束的isActive属性设置为true。咄

来自UIImagePicker Orientation的图片不正确

1 个答案: