Created
November 25, 2012 05:44
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Custom caching for + (UIImage *)imageNamed:(NSString *)name
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| //UIImage+Cache.h | |
| #import <UIKit/UIKit.h> | |
| @interface UIImage (Cache) | |
| + (UIImage *)imageNamed:(NSString *)name; | |
| + (void)freeCache; | |
| + (BOOL)freeCacheOnMemoryWarning; | |
| + (void)setFreeCacheOnMemoryWarning:(BOOL)freeCacheOnMemoryWarning; | |
| @end | |
| //UIImage+Cache.m | |
| #import "UIImage+Cache.h" | |
| static NSMutableDictionary *_cache; | |
| static BOOL _freeCacheOnMemoryWarning; | |
| @implementation UIImage (Cache) | |
| #pragma clang diagnostic push | |
| #pragma clang diagnostic ignored "-Wobjc-protocol-method-implementation" | |
| + (UIImage *)imageNamed:(NSString *)name | |
| { | |
| NSAssert(name, @"[UIImage+Cache imageNamed:%@]: image not found!", name); | |
| NSString *path = name.stringByDeletingLastPathComponent; | |
| NSString *fileName = name.lastPathComponent; | |
| NSArray *comps = [fileName componentsSeparatedByString:@"."]; | |
| NSString *type = @"png"; | |
| if (comps.count > 1) | |
| { | |
| type = comps.lastObject; | |
| fileName = [fileName substringWithRange:NSMakeRange(0, fileName.length - type.length - 1)]; | |
| } | |
| else | |
| fileName = [comps objectAtIndex:0]; | |
| path = [path stringByAppendingPathComponent:fileName]; | |
| UIImage *image = (UIImage*)[_cache objectForKey:path]; | |
| if (image) | |
| return image; | |
| image = [UIImage.alloc initWithContentsOfFile:[NSBundle.mainBundle pathForResource:path ofType:type]]; | |
| NSAssert(image, @"[UIImage+Cache imageNamed:@\"%@\"]: image not found!", name); | |
| if (!_cache) | |
| _cache = NSMutableDictionary.new; | |
| [_cache setObject:image forKey:path]; | |
| return image; | |
| } | |
| #pragma clang diagnostic pop | |
| + (void)freeCache | |
| { | |
| NSLog(@"[UIImage+Cache freeCache]:\n%@", _cache); | |
| _cache = nil; | |
| } | |
| + (BOOL)freeCacheOnMemoryWarning | |
| { | |
| return _freeCacheOnMemoryWarning; | |
| } | |
| + (void)setFreeCacheOnMemoryWarning:(BOOL)freeCacheOnMemoryWarning | |
| { | |
| if (freeCacheOnMemoryWarning) | |
| if (!_freeCacheOnMemoryWarning) | |
| [NSNotificationCenter.defaultCenter addObserver:self selector:@selector(freeCache) name:UIApplicationDidReceiveMemoryWarningNotification object:nil]; | |
| else; | |
| else | |
| if (_freeCacheOnMemoryWarning) | |
| [NSNotificationCenter.defaultCenter removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil]; | |
| _freeCacheOnMemoryWarning = freeCacheOnMemoryWarning; | |
| } | |
| @end |
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