Protocollo <GCKUIImageCache>
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Un protocollo che definisce un mezzo per recuperare e memorizzare nella cache le immagini.
Un'implementazione predefinita viene utilizzata internamente dal framework per memorizzare nella cache l'artwork multimediale visualizzato nell'interfaccia utente. L'applicazione può fornire un'implementazione personalizzata impostando la proprietà GCKCastContext::imageCache.
- Dal
- 3,0
Eredita <NSObject>.
| - (void) fetchImageForURL: |
|
(NSURL *) |
imageURL |
| completion: |
|
(void(^)(UIImage *_Nullable)) |
completion |
|
|
| |
Recupera l'immagine all'URL specificato e restituisce una versione scalata dell'immagine.
Si tratta di un'operazione asincrona.
- 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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Ultimo aggiornamento 2025-07-25 UTC.
[null,null,["Ultimo aggiornamento 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. |"]]
