从远程LSR文件创建一个UIImage。

I'm trying to create a UIImage with one of Apple's new layered image files that's hosted on a remote server.

我正在尝试用苹果的一个新的分层图像文件创建一个UIImage，它驻留在一个远程服务器上。

The sample code below downloads the lsr file correctly (the data var holds a value), but creating a new NSImage with it results in a nil value. Ignore the fact that this code is synchronous and inefficient.

下面的示例代码正确地下载了lsr文件(数据var保存了一个值)，但是使用它创建一个新的NSImage会得到一个nil值。忽略这段代码是同步和低效的这一事实。

if let url = NSURL(string: "http://path/to/my/layered/image.lsr") {
    if let data = NSData(contentsOfURL: url) {
        let image = UIImage(data: data) // `image` var is nil here
        imageView?.image = image
    }
}

Any thoughts on how to download an LSR and create a UIImage with it?

对于如何下载一个LSR并使用它创建一个UIImage有什么想法吗?

1 个解决方案

#1

That's how i solved it:

我就是这样解决的:

Convert you .lsr file to a .lcr file doing this from console: xcrun --sdk appletvos layerutil --c your_file.lsr
将.lsr文件转换为.lcr文件，从控制台:xcrun—sdk appletvos layerutil—c your_file.lsr执行此操作
Upload your_file.lcr on your server
上传your_file。电感电容电阻测量服务器上

Put these two functions into an util class:

将这两个函数放到util类中:

func getDataFromUrl(url:NSURL, completion: ((data: NSData?, response: NSURLResponse?, error: NSError? ) -> Void)) {
    NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) in
        completion(data: data, response: response, error: error)
    }.resume()
}

func downloadImage(url: NSURL, imageView: UIImageView){
    print("Started downloading \"\(url.URLByDeletingPathExtension!.lastPathComponent!)\".")
    getDataFromUrl(url) { (data, response, error)  in
        dispatch_async(dispatch_get_main_queue()) { () -> Void in
            guard let data = data where error == nil else { return }
            print("Finished downloading \"\(url.URLByDeletingPathExtension!.lastPathComponent!)\".")
            imageView.image = UIImage(data: data)
        }
    }
}

Use it like this:

使用它是这样的:

if let checkedUrl = NSURL(string: "http://domain/path/to/your_file.lcr") {
    self.my_ui_view.contentMode = .ScaleAspectFit
    downloadImage(checkedUrl, imageView: self.my_ui_view.contentMode)
}

This will use the image without saving it into the document directory, if you need that solution, ask me and i'll share.

这将使用映像而不会将其保存到文档目录中，如果您需要该解决方案，请询问我，我将与您共享。

#1