Question

试图将聊天客户端从swift 4传递到swift 4.2，并使用选择器发现问题。

UIImagePickerControllerEditedImage // 不能为索引为'UIImagePickerController.InfoKey'的'[String：Any]'类型下标

int startX = -halfWidth  + rect.Left;
int startY = -halfHeight + rect.Top;
int stopX  = width  - halfWidth  - ( width  - rect.Right );
int stopY  = height - halfHeight - ( height - rect.Bottom );

Answer 1

方法签名已更改为

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any])

您应该看到功能名称的警告消息

实例方法   几乎'imagePickerController（：didFinishPickingMediaWithInfo :)'   符合可选要求   协议的“ imagePickerController（：didFinishPickingMediaWithInfo :)”   'UIImagePickerControllerDelegate'

候选人的类型不匹配'（UIImagePickerController，[String：   任何]）->（）'

将'imagePickerController（_：didFinishPickingMediaWithInfo :)'移动到   另一个扩展，以使此警告静音

将'imagePickerController（_：didFinishPickingMediaWithInfo :)'设为私有   消除此警告

需求'imagePickerController（_：didFinishPickingMediaWithInfo :)'   在此处声明（UIKit.UIImagePickerControllerDelegate）

Answer 2

在Swift 4.2中，imagePickerController委托方法有所改变。请检查以下代码。

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

    var selectedImage: UIImage?
    if let editedImage = info[.editedImage] as? UIImage {
        selectedImage = editedImage
        self.profileImage.image = selectedImage!
        picker.dismiss(animated: true, completion: nil)
    } else if let originalImage = info[.originalImage] as? UIImage {
        selectedImage = originalImage
        self.profileImage.image = selectedImage!
        picker.dismiss(animated: true, completion: nil)
    }

}

这可以肯定地工作。

Answer 3

喜欢

private func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
    picker.dismiss(animated: true, completion: nil)
    let image = info[UIImagePickerController.InfoKey.originalImage]! as! UIImage
    ...
}

Answer 4

Swift4.2

 //MARK:- ImagePicker Controller Delegate
 //MARK:-

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    dismiss(animated: true, completion: nil)
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    if let chosenImage = info[.originalImage] as? UIImage {
        yourimage.contentMode = .scaleAspectFill
        yourimage.image = chosenImage

    } else{
        print("Something went wrong")
    }
}

Answer 5

using System;
using Xamarin.Forms;
namespace Sample.Utils
{
    /// <summary>
    /// Allows setting Top,Left,Right,Bottom Margin independently from each other.
    /// The default implementation does not allow that, even from code. This
    /// attached property remembers the previously set margins and only modifies what you intend to modify.
    /// </summary>
    public static class Margin
    {
        public static readonly BindableProperty LeftProperty = BindableProperty.CreateAttached(
            propertyName: "Left",
            returnType: typeof(double),
            declaringType: typeof(Margin),
            propertyChanged: LeftPropertyChanged,
            defaultValue: 0.0d);

        private static void LeftPropertyChanged(BindableObject bindable, object oldValue, object newValue)
        {
            SetLeft(bindable, (double)newValue);
        }

        public static void SetLeft(BindableObject element, double value)
        {
            var view = element as View;
            if (view != null)
            {
                Thickness currentMargin = (Xamarin.Forms.Thickness)view.GetValue(View.MarginProperty);

                view.Margin = new Thickness(value, currentMargin.Top, currentMargin.Right, currentMargin.Bottom);
            }
        }

        public static double GetLeft(BindableObject element)
        {
            View view = element as View;
            if (view != null)
            {
                Thickness margin = (Xamarin.Forms.Thickness)view.GetValue(View.MarginProperty);
                return margin.Left;
            }
            return (double)LeftProperty.DefaultValue;
        }

    }
}

Answer 6

extension CameraViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        if let chosenImage = info[.originalImage] as? UIImage {
            selectedImage = chosenImage
            photo.image = chosenImage
        }
        dismiss(animated: true, completion: nil)
    }
}

以上代码解决了警告，图片成功上传

Swift 4.2 imagePickerController问题

6 个答案: