An image cache manager for WKInterfaceDevice of Apple WatchKit (watchOS 1)

How it works

If you add a data to the cache via EMTImageCacheManager, the cache is automatically named its name as below.

cache<current date>_<image name>

Then, if WKInterfaceDevice's cachedImages is already full, EMTImageCacheManager removes cache files as much as necessary in ascending order by added date.

Installation

Simply add class files to your project, or use CocoaPods.

Podfile

platform :ios, "8.2"
target :'Your WatchKit Extension Name', :exclusive => true do
    pod 'EMTImageCacheManager', '~> 1.0.6'
end

Usage

Initialization

EMTImageCacheManager is a singleton class. Get instance via the instance method.

All data named by EMTImageCacheManager will be extracted from caches automatically when you try to add/get/remove a cache via the class at first. If you want to do that process in your timing, use a following method.

[[EMTImageCacheManager instance] prepareOrderedCacheInformations];

Add a image data to cache

NSString *imageName = [[EMTImageCacheManager instance] addOrderedCachedImageWithData:data name:@"image01"];
if (imageName) {
    //Cache succeeded. You can handle a image with the returned imageName.
    [self.thumbImage setImageNamed:imageName];
}
else {
    //Cache is full with non-EMTImageCacheManager images.
    [self.thumbImage setImageData:data];
}

Retrieve the imageName of cached image data

NSString *imageName = [[EMTImageCacheManager instance] getOrderedCacheKeyForName:@"image01"];
if (imageName) {
    //Cache found
    [self.thumbImage setImageNamed:imageName];
}

Remove cached images

//Remove a single file added via EMTImageCacheManager
[[EMTImageCacheManager instance] removeOrderedCachedImageForName:@"image01"];

//Remove all files added via EMTImageCacheManager
[[EMTImageCacheManager instance] removeAllOrderedCachedImage];

Requirements

• iOS 8.2+

License

EMTImageCacheManager is available under the MIT license. See the LICENSE file for more info.