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Caching for Objective-C/iPhone -- All new updates will be here: http://github.com/enormego/EGOCache
//
// EGOCache.h
// enormego
//
// Created by Shaun Harrison on 7/4/09.
// Copyright 2009 enormego. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface EGOCache : NSObject {
@private
NSMutableDictionary* cacheDictionary;
}
+ (EGOCache*)currentCache;
- (BOOL)hasCacheForKey:(NSString*)key;
- (NSData*)dataForKey:(NSString*)key;
- (void)setData:(NSData*)data forKey:(NSString*)key; // withTimeoutInterval: 1 day
- (void)setData:(NSData*)data forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval;
- (NSString*)stringForKey:(NSString*)key;
- (void)setString:(NSString*)aString forKey:(NSString*)key; // withTimeoutInterval: 1 day
- (void)setString:(NSString*)aString forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval;
#if TARGET_OS_IPHONE
- (UIImage*)imageForKey:(NSString*)key;
- (void)setImage:(UIImage*)anImage forKey:(NSString*)key; // withTimeoutInterval: 1 day
- (void)setImage:(UIImage*)anImage forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval;
#else
- (NSImage*)imageForKey:(NSString*)key;
- (void)setImage:(NSImage*)anImage forKey:(NSString*)key; // withTimeoutInterval: 1 day
- (void)setImage:(NSImage*)anImage forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval;
#endif
@end
//
// EGOCache.m
// enormego
//
// Created by Shaun Harrison on 7/4/09.
// Copyright 2009 enormego. All rights reserved.
//
#import "EGOCache.h"
#define cachePathForKey(key) [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"Documents/EGOCache/%@", key]]
static id __instance;
@implementation EGOCache
+ (EGOCache*)currentCache {
@synchronized(self) {
if(!__instance) {
__instance = [[EGOCache alloc] init];
}
}
return __instance;
}
- (id)init {
if((self = [super init])) {
NSDictionary* dict = [[NSUserDefaults standardUserDefaults] objectForKey:@"EGOCache"];
if([dict isKindOfClass:[NSDictionary class]]) {
cacheDictionary = [dict mutableCopy];
} else {
cacheDictionary = [[NSMutableDictionary alloc] init];
}
[[NSFileManager defaultManager] createDirectoryAtPath:cachePathForKey(@"")
withIntermediateDirectories:YES
attributes:nil
error:NULL];
for(NSString* key in cacheDictionary) {
NSDate* date = [cacheDictionary objectForKey:key];
if([[[NSDate date] earlierDate:date] isEqualToDate:date]) {
[[NSFileManager defaultManager] removeItemAtPath:cachePathForKey(key) error:NULL];
}
}
}
return self;
}
- (BOOL)hasCacheForKey:(NSString*)key {
NSDate* date = [cacheDictionary objectForKey:key];
if(!date) return NO;
if([[[NSDate date] earlierDate:date] isEqualToDate:date]) return NO;
return [[NSFileManager defaultManager] fileExistsAtPath:cachePathForKey(key)];
}
#pragma mark -
#pragma mark Data methods
- (void)setData:(NSData*)data forKey:(NSString*)key {
[self setData:data forKey:key withTimeoutInterval:60 * 60 * 24];
}
- (void)setData:(NSData*)data forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval {
[data writeToFile:cachePathForKey(key) atomically:YES];
[cacheDictionary setObject:[NSDate dateWithTimeIntervalSinceNow:timeoutInterval] forKey:key];
[[NSUserDefaults standardUserDefaults] setObject:cacheDictionary forKey:@"EGOCache"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
- (NSData*)dataForKey:(NSString*)key {
if([self hasCacheForKey:key]) {
return [NSData dataWithContentsOfFile:cachePathForKey(key) options:0 error:NULL];
} else {
return nil;
}
}
#pragma mark -
#pragma mark String methods
- (NSString*)stringForKey:(NSString*)key {
return [[[NSString alloc] initWithData:[self dataForKey:key] encoding:NSUTF8StringEncoding] autorelease];
}
- (void)setString:(NSString*)aString forKey:(NSString*)key {
[self setString:aString forKey:key withTimeoutInterval:60 * 60 * 24];
}
- (void)setString:(NSString*)aString forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval {
[self setData:[aString dataUsingEncoding:NSUTF8StringEncoding] forKey:key withTimeoutInterval:timeoutInterval];
}
#pragma mark -
#pragma mark Image methds
#if TARGET_OS_IPHONE
- (UIImage*)imageForKey:(NSString*)key {
return [UIImage imageWithData:[self dataForKey:key]];
}
- (void)setImage:(UIImage*)anImage forKey:(NSString*)key {
[self setImage:anImage forKey:key withTimeoutInterval:60 * 60 * 24];
}
- (void)setImage:(UIImage*)anImage forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval {
[self setData:UIImagePNGRepresentation(anImage) forKey:key withTimeoutInterval:timeoutInterval];
}
#else
- (NSImage*)imageForKey:(NSString*)key {
return [[[NSImage alloc] initWithData:[self dataForKey:key]] autorelease];
}
- (void)setImage:(NSImage*)anImage forKey:(NSString*)key {
[self setImage:anImage forKey:key withTimeoutInterval:60 * 60 * 24];
}
- (void)setImage:(NSImage*)anImage forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval {
[self setData:[[[anImage representations] objectAtIndex:0] representationUsingType:NSPNGFileType properties:nil]
forKey:key withTimeoutInterval:timeoutInterval];
}
#endif
#pragma mark -
- (void)dealloc {
[cacheDictionary release];
[super dealloc];
}
@end

How do I use this class? :)

Yeah...is there any documentation for this?

having a hard time using it too with NSMutableDictionary

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