ios - 我想使用两个按钮选择图像，并希望在 swift 中的两个不同 ImageView 上显示这些图像。我该怎么做？

Question

我想使用两个按钮选择图像，并希望在 swift 中的两个不同 ImageView 上显示这些图像

 func pickimage(){
            if UIImagePickerController.isSourceTypeAvailable(.photoLibrary){

                let controller = UIImagePickerController()
                controller.delegate = self
                controller.sourceType = .photoLibrary
                controller.allowsEditing = false
                present(controller, animated: true, completion: nil)
            }

        }

图像选择器代理

extension AdnewDOC : UIImagePickerControllerDelegate,UINavigationControllerDelegate {

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


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


            let image = info[UIImagePickerControllerOriginalImage] as! UIImage
            frontview.image = image
            frontview.contentMode = .scaleAspectFill

         dismiss(animated: true, completion: nil)


    }


}

Answer 1

您可以使用objective-c关联类型 objc_setAssociatedObject和objc_getAssociatedObject像这样:。

我已经更新了您的方法，请从按钮操作方法传递您的 ImageView 对象(您想要显示图像的 ImageView )。就像按钮的演示操作方法:

import ObjectiveC

var myKey = "myObjectKey"


@IBAction func firstButtonAction(_ sender: Any) {
            pickimage(imageView: firstImageView)
    }

@IBAction func secondButtonAction(_ sender: Any) {
            pickimage(imageView: secondImageView)
    }


func pickimage(imageView: UIImageView){
        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary){
            let controller = UIImagePickerController()
            objc_setAssociatedObject(controller, &myKey, imageView, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
            controller.delegate = self
            controller.sourceType = .photoLibrary
            controller.allowsEditing = false
            present(controller, animated: true, completion: nil)
        }
    }

并在委托(delegate)方法中获取图像对象，如下所示:

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

        let imageView = objc_getAssociatedObject(picker, &myKey) as! UIImageView

        let image = info[UIImagePickerControllerOriginalImage] as! UIImage
        imageView.image = image
        imageView.contentMode = .scaleAspectFill
        dismiss(animated: true, completion: nil)
}

For more understanding how to work objc_setAssociatedObject and objc_getAssociatedObject please check below links:

http://blog.corywiles.com/objective-c-runtime-with-swfit

http://en.swifter.tips/associated-object/