无法在swift iOS 8 Extension中投射UIImage

Question

我有一个奇怪的问题,我正在尝试构建一个动作扩展,它将从提供的图像中扫描条形码.这是代码.

override func viewDidLoad() {
    super.viewDidLoad()

    // Get the item[s] we're handling from the extension context.

    // For example, look for an image and place it into an image view.
    // Replace this with something appropriate for the type[s] your extension supports.
    var imageFound = false
    for item: AnyObject in self.extensionContext!.inputItems {
        let inputItem = item as NSExtensionItem
        for provider: AnyObject in inputItem.attachments! {
            let itemProvider = provider as NSItemProvider
            if itemProvider.hasItemConformingToTypeIdentifier(kUTTypeImage as NSString) {
                // This is an image. We'll load it, then place it in our image view.
                weak var weakImageView = self.imageView
                itemProvider.loadItemForTypeIdentifier(kUTTypeImage as NSString, options: nil, completionHandler: { (image, error) in
                    if image != nil {
                        dispatch_async(dispatch_get_main_queue(),{
                            if let imageView = weakImageView {
                                var imageToSet: UIImage? = image as? UIImage
                                imageView.image = image as? UIImage
                            }

                            self.imageToScan = self.imageView.image
                            self.scanFromImage(self.imageToScan!)
                        })
                    }
                })

                imageFound = true
                break
            }
        }

        if (imageFound) {
            // We only handle one image, so stop looking for more.
            break
        }
    }
}

现在,每当我尝试获取UIImage时,我总是为零,而在图像中,我可以看到接收到的图像.但是当我尝试从该图像获取UIImage时,它总是返回nil.以下是可能有帮助的调试屏幕截图

更新:以下是收到的图像说明:

打印图像描述:(NSSecureCoding!)image =(instance_type = Builtin.RawPointer = 0x15d674c0 - > 0x32b6be5c(void*)0x32b6be70:NSURL)

我使用目标C创建了相同的扩展,它可以工作,但不是在swift中.这是客观的C代码:

- (void)viewDidLoad {
[super viewDidLoad];

// Get the item[s] we're handling from the extension context.

// For example, look for an image and place it into an image view.
// Replace this with something appropriate for the type[s] your extension supports.
BOOL imageFound = NO;
for (NSExtensionItem *item in self.extensionContext.inputItems) {
    for (NSItemProvider *itemProvider in item.attachments) {
        if ([itemProvider hasItemConformingToTypeIdentifier:(NSString *)kUTTypeImage]) {
            // This is an image. We'll load it, then place it in our image view.
            __weak UIImageView *imageView = self.imageView;
            [itemProvider loadItemForTypeIdentifier:(NSString *)kUTTypeImage options:nil completionHandler:^(UIImage *image, NSError *error) {
                if(image) {
                     dispatch_async(dispatch_get_main_queue(), ^{
                        [imageView setImage:image];
                        imageToScan = image;
                        [self scanImage:imageToScan];
                    });
                }
            }];

            imageFound = YES;
            break;
        }
    }

    if (imageFound) {
        // We only handle one image, so stop looking for more.
        break;
    }
}

}

我试图在谷歌上搜索很多,但一无所获.我甚至尝试过更改过的代码但不能正常工作,这里是更改后的代码:

                    itemProvider.loadItemForTypeIdentifier(kUTTypeImage as NSString, options: nil, completionHandler: { (image, error) in
                    if image != nil {
                        NSOperationQueue.mainQueue().addOperationWithBlock {
                            if let imageView = weakImageView {
                                var imageToSet: UIImage? = image as? UIImage
                                imageView.image = image as? UIImage
                            }

                            self.imageToScan = self.imageView.image
                            self.scanFromImage(self.imageToScan)
                        }
                    }
                })

更新:我注意到了一件事; 如果我创建一个新项目并为其添加一个动作扩展,则会自动生成相同的代码,除了我在块中添加的几行.即使没有更改单行自动生成的代码,imageView.image也是零.这是一个快速的错误？或者我的Xcode应用程序的一些错误.

Answer 1

问题是图像不是UIImage,它是NSURL.

将代码更改为此代码:

imageView.image = UIImage(data: NSData(contentsOfURL: image as NSURL)!)!