<GCKUIImageCache> Protokoll
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Protokoll, das eine Methode zum Abrufen und Speichern von Bildern definiert.
Eine Standardimplementierung wird vom Framework intern verwendet, um Media-Artwork zu speichern, die auf der Benutzeroberfläche angezeigt werden. Die Anwendung kann durch Festlegen der Eigenschaft GCKCastContext::imageCache eine benutzerdefinierte Implementierung bereitstellen.
- Seit
- 3,0
Übernimmt <NSObject>.
| - (void) fetchImageForURL: |
|
(NSURL *) |
imageURL |
| completion: |
|
(void(^)(UIImage *_Nullable)) |
completion |
|
|
| |
Ruft das Bild unter der angegebenen URL ab und gibt eine skalierte Version des Bildes zurück.
Dies ist ein asynchroner Vorgang.
- Parameters
-
| imageURL | The URL of the image. |
| completion | A block to invoke once the image has been retrieved. The image should be passed to the block. If there was an error retrieving the image, nil should be passed instead. The block should only be invoked on the main thread. |
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Zuletzt aktualisiert: 2025-07-25 (UTC).
[null,null,["Zuletzt aktualisiert: 2025-07-25 (UTC)."],[[["\u003cp\u003eThe \u003ccode\u003eGCKUIImageCache\u003c/code\u003e protocol defines how images are retrieved and cached for display within the Google Cast framework.\u003c/p\u003e\n"],["\u003cp\u003eDevelopers can customize image caching by providing their own implementation and setting it on the \u003ccode\u003eGCKCastContext\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003efetchImageForURL:completion:\u003c/code\u003e method retrieves and scales images asynchronously, notifying the caller via a completion block on the main thread.\u003c/p\u003e\n"]]],["The `GCKUIImageCache` protocol defines image retrieval and caching. It utilizes a default implementation for media artwork displayed in the user interface, but applications can provide custom implementations via `GCKCastContext::imageCache`. The core functionality is provided by the `fetchImageForURL:completion:` method, which asynchronously fetches an image from a given URL. It then returns a scaled version of the image to the main thread through a completion block, or `nil` if an error occurs.\n"],null,["# <GCKUIImageCache> Protocol\n\n[Instance Methods](#pub-methods) \n\\\u003cGCKUIImageCache\\\u003e Protocol Reference \n\nOverview\n--------\n\nA protocol that defines a means of retrieving and caching images.\n\nA default implementation is used internally by the framework to cache media artwork that is displayed in the user interface. The application can provide a custom implementation by setting the [GCKCastContext::imageCache](/cast/docs/reference/ios/category_g_c_k_cast_context_07_u_i_08#a9b83c154f8700cb322f9cf42738bd98a \"The image cache implementation that will be used by the framework to fetch images that are referenced...\") property.\n\nSince\n: 3.0\n\nInherits \\\u003cNSObject\\\u003e.\n\n|--------|-------------------------------------------------------------------------------------------------------------------------------|\n| Instance Method Summary ----------------------- ||\n| (void) | - [fetchImageForURL:completion:](/cast/docs/reference/ios/protocol_g_c_k_u_i_image_cache-p#a448a9f34fd1631b69b743882e7af38f4) |\n| | Fetches the image at the given URL, and returns a scaled version of the image. [More...](#a448a9f34fd1631b69b743882e7af38f4) |\n| ||\n\nMethod Detail\n-------------\n\n|----------------------------|---|---------------------------------|--------------|\n| - (void) fetchImageForURL: | | (NSURL \\*) | *imageURL* |\n| completion: | | (void(\\^)(UIImage \\*_Nullable)) | *completion* |\n| | | | |\n\nFetches the image at the given URL, and returns a scaled version of the image.\n\nThis is an asynchronous operation.\n\nParameters\n:\n\n |------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n | imageURL | The URL of the image. |\n | completion | A block to invoke once the image has been retrieved. The image should be passed to the block. If there was an error retrieving the image, `nil` should be passed instead. The block should only be invoked on the main thread. |"]]
