swift - 使用 UIImagePickerController 加载相机或 PhotoLibrary？

Question

这个问题已经有答案了:

iOS 10 - App crashes To access photo library or device camera via UIImagePickerController (2 个回答)

已关闭 6 年前。

我最近在 iOS 10 上的 Swift 3 中输入了拍照或选择图片的代码。当调用打开的相机或照片库时，我的应用程序崩溃并显示“线程 14:信号 SIGABRT”，且没有任何消息。正在发生的事情的其他迹象。对我来说，根据我的调试，这种情况是在尝试加载 native 相机 View 或照片库时发生的。任何帮助将不胜感激!

代码如下:

class CameraViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

@IBOutlet weak var imageView: UIImageView!


var imagePicker = UIImagePickerController()

override func viewDidLoad() {
    super.viewDidLoad()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}


@IBAction func BTN_takePhoto(_ sender: AnyObject) {

    print("button pressed")

    if (UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera)){

        print("source available")
        //imagePicker =  UIImagePickerController()
        print(1)
        imagePicker.delegate = self
        print(2)
        imagePicker.sourceType = UIImagePickerControllerSourceType.camera
        print(3)
        imagePicker.mediaTypes = [kUTTypeImage as String]
        print(4)
        imagePicker.allowsEditing = true
        print(5)
        self.present(imagePicker, animated: true, completion: nil)
        print(6)
    }
    else {
        print("ERROR: source not available")
        NSLog("No Camera")
        let alert = UIAlertController(title: "No camera", message: "Please allow this app the use of your camera in settings or buy a device that has a camera.", preferredStyle: UIAlertControllerStyle.alert)
        alert.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default, handler: nil))
        self.present(alert, animated: true, completion: nil)
    }
}

@IBAction func BTN_pickFromLibrary(_ sender: AnyObject) {

    imagePicker.allowsEditing = false //2
    imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary //3
    present(imagePicker, animated: true, completion: nil)//4


}


func imagePickerController(imagePicker: UIImagePickerController, didFinishPickingMediaWithInfo info: NSDictionary!) {
    NSLog("Received image from camera")
    let mediaType = info[UIImagePickerControllerMediaType] as! String
    var originalImage:UIImage?, editedImage:UIImage?, imageToSave:UIImage?
    let compResult:CFComparisonResult = CFStringCompare(mediaType as NSString!, kUTTypeImage, CFStringCompareFlags.compareCaseInsensitive)
    if ( compResult == CFComparisonResult.compareEqualTo ) {

        editedImage = info[UIImagePickerControllerEditedImage] as! UIImage?
        originalImage = info[UIImagePickerControllerOriginalImage] as! UIImage?

        if ( editedImage != nil ) {
            imageToSave = editedImage
        } else {
            imageToSave = originalImage
        }
        imageView.image = imageToSave
        imageView.reloadInputViews()
    }
    imagePicker.dismiss(animated: true, completion: nil)
}

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


/*
private func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    imagePicker.dismiss(animated: true, completion: nil)
    imageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage
}
*/

}

Answer 1

从 iOS 10 开始，您现在必须在 Info.plist 中添加 key

<key>NSPhotoLibraryUsageDescription</key>
<string>Use Photos</string>

检查这个link了解更多详情