ios客户端学习－EGOCache
步骤1:
创建
EGOCache.h 文件
#import <Foundation/Foundation.h>
@interface EGOCache : NSObject {
@private
NSMutableDictionary* cacheDictionary;
NSMutableDictionary* cacheDictionary_forSetDate;
NSOperationQueue* diskOperationQueue;
NSTimeInterval defaultTimeoutInterval;
}
+ (EGOCache*)currentCache;
- (void)clearCache;
- (void)removeCacheForKey:(NSString*)key;
- (BOOL)hasCacheForKey:(NSString*)key;
- (BOOL)hasCacheForKey:(NSString*)key withInTimeIntervalFromSet:(NSTimeInterval)timeInterval;
- (NSData*)dataForKey:(NSString*)key;
- (void)setData:(NSData*)data forKey:(NSString*)key;
- (void)setData:(NSData*)data forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval;
- (NSString*)stringForKey:(NSString*)key;
- (void)setString:(NSString*)aString forKey:(NSString*)key;
- (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;
- (void)setImage:(UIImage*)anImage forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval;
#else
- (NSImage*)imageForKey:(NSString*)key;
- (void)setImage:(NSImage*)anImage forKey:(NSString*)key;
- (void)setImage:(NSImage*)anImage forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval;
#endif
- (NSData*)plistForKey:(NSString*)key;
- (void)setPlist:(id)plistObject forKey:(NSString*)key;
- (void)setPlist:(id)plistObject forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval;
- (void)copyFilePath:(NSString*)filePath asKey:(NSString*)key;
- (void)copyFilePath:(NSString*)filePath asKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval;
@property(nonatomic,assign) NSTimeInterval defaultTimeoutInterval; // Default is 1 day
@end
2.创建EGOCache.m 文件
#import "EGOCache.h"
#if DEBUG
#define CHECK_FOR_EGOCACHE_PLIST() if([key isEqualToString:@"EGOCache.plist"]) { \
NSLog(@"EGOCache.plist is a reserved key and can not be modified."); \
return; }
#else
#define CHECK_FOR_EGOCACHE_PLIST() if([key isEqualToString:@"EGOCache.plist"]) return;
#endif
static NSString* _EGOCacheDirectory;
static inline NSString* EGOCacheDirectory() {
if(!_EGOCacheDirectory) {
NSString* cachesDirectory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
_EGOCacheDirectory = [[[cachesDirectory stringByAppendingPathComponent:[[NSProcessInfo processInfo] processName]] stringByAppendingPathComponent:@"EGOCache"] copy];
}
//NSLog(@"cachesDirectory:%@",_EGOCacheDirectory);
return _EGOCacheDirectory;
}
static inline NSString* cachePathForKey(NSString* key) {
return [EGOCacheDirectory() stringByAppendingPathComponent:key];
}
static EGOCache* __instance;
@interface EGOCache ()
- (void)removeItemFromCache:(NSString*)key;
- (void)performDiskWriteOperation:(NSInvocation *)invoction;
- (void)saveCacheDictionary;
@end
#pragma mark -
@implementation EGOCache
@synthesize defaultTimeoutInterval;
+ (EGOCache*)currentCache {
@synchronized(self) {
if(!__instance) {
__instance = [[EGOCache alloc] init];
__instance.defaultTimeoutInterval = 60*60*42*30*12;
}
}
return __instance;
}
- (id)init {
if((self = [super init])) {
NSDictionary* dict = [NSDictionary dictionaryWithContentsOfFile:cachePathForKey(@"EGOCache.plist")];
if([dict isKindOfClass:[NSDictionary class]]) {
cacheDictionary = [dict mutableCopy];
} else {
cacheDictionary = [[NSMutableDictionary alloc] init];
}
cacheDictionary_forSetDate = [[NSMutableDictionary alloc] init];
diskOperationQueue = [[NSOperationQueue alloc] init];
[[NSFileManager defaultManager] createDirectoryAtPath:EGOCacheDirectory()
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;
}
- (void)clearCache {
for(NSString* key in [cacheDictionary allKeys]) {
[self removeItemFromCache:key];
}
[self saveCacheDictionary];
}
- (void)removeCacheForKey:(NSString*)key {
CHECK_FOR_EGOCACHE_PLIST();
[self removeItemFromCache:key];
[self saveCacheDictionary];
}
- (void)removeItemFromCache:(NSString*)key {
NSString* cachePath = cachePathForKey(key);
NSInvocation* deleteInvocation = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:@selector(deleteDataAtPath:)]];
[deleteInvocation setTarget:self];
[deleteInvocation setSelector:@selector(deleteDataAtPath:)];
[deleteInvocation setArgument:&cachePath atIndex:2];
[self performDiskWriteOperation:deleteInvocation];
[cacheDictionary removeObjectForKey:key];
}
- (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)];
}
- (BOOL)hasCacheForKey:(NSString*)key withInTimeIntervalFromSet:(NSTimeInterval)timeInterval {
if (![self hasCacheForKey:key]) return NO;
NSDate *setDate = (NSDate *)[cacheDictionary_forSetDate objectForKey:key];
NSTimeInterval interval = [[NSDate date] timeIntervalSinceDate:setDate];
NSLog(@"------interval=%f---------timeInterval=%f",interval,timeInterval);
return interval <= timeInterval;
}
#pragma mark -
#pragma mark Copy file methods
- (void)copyFilePath:(NSString*)filePath asKey:(NSString*)key {
[self copyFilePath:filePath asKey:key withTimeoutInterval:self.defaultTimeoutInterval];
}
- (void)copyFilePath:(NSString*)filePath asKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval {
[[NSFileManager defaultManager] copyItemAtPath:filePath toPath:cachePathForKey(key) error:NULL];
[cacheDictionary setObject:[NSDate dateWithTimeIntervalSinceNow:timeoutInterval] forKey:key];
[self performSelectorOnMainThread:@selector(saveAfterDelay) withObject:nil waitUntilDone:YES];
}
#pragma mark -
#pragma mark Data methods
- (void)setData:(NSData*)data forKey:(NSString*)key {
[self setData:data forKey:key withTimeoutInterval:self.defaultTimeoutInterval];
}
- (void)setData:(NSData*)data forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval {
CHECK_FOR_EGOCACHE_PLIST();
[cacheDictionary_forSetDate setObject:[NSDate date] forKey:key];
NSString* cachePath = cachePathForKey(key);
NSInvocation* writeInvocation = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:@selector(writeData:toPath:)]];
[writeInvocation setTarget:self];
[writeInvocation setSelector:@selector(writeData:toPath:)];
[writeInvocation setArgument:&data atIndex:2];
[writeInvocation setArgument:&cachePath atIndex:3];
[self performDiskWriteOperation:writeInvocation];
[cacheDictionary setObject:[NSDate dateWithTimeIntervalSinceNow:timeoutInterval] forKey:key];
[self performSelectorOnMainThread:@selector(saveAfterDelay) withObject:nil waitUntilDone:YES]; // Need to make sure the save delay get scheduled in the main runloop, not the current threads
}
- (void)saveAfterDelay { // Prevents multiple-rapid saves from happening, which will slow down your app
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(saveCacheDictionary) object:nil];
[self performSelector:@selector(saveCacheDictionary) withObject:nil afterDelay:0.3];
}
- (NSData*)dataForKey:(NSString*)key {
if([self hasCacheForKey:key]) {
return [NSData dataWithContentsOfFile:cachePathForKey(key) options:0 error:NULL];
} else {
return nil;
}
}
- (void)writeData:(NSData*)data toPath:(NSString *)path; {
[data writeToFile:path atomically:YES];
}
- (void)deleteDataAtPath:(NSString *)path {
[[NSFileManager defaultManager] removeItemAtPath:path error:NULL];
}
- (void)saveCacheDictionary {
@synchronized(self) {
[cacheDictionary writeToFile:cachePathForKey(@"EGOCache.plist") atomically:YES];
}
}
#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:self.defaultTimeoutInterval];
}
- (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 imageWithContentsOfFile:cachePathForKey(key)];
}
- (void)setImage:(UIImage*)anImage forKey:(NSString*)key {
[self setImage:anImage forKey:key withTimeoutInterval:self.defaultTimeoutInterval];
}
- (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:self.defaultTimeoutInterval];
}
- (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 -
#pragma mark Property List methods
- (NSData*)plistForKey:(NSString*)key; {
NSData* plistData = [self dataForKey:key];
return [NSPropertyListSerialization propertyListFromData:plistData
mutabilityOption:NSPropertyListImmutable
format:nil
errorDescription:nil];
}
- (void)setPlist:(id)plistObject forKey:(NSString*)key; {
[self setPlist:plistObject forKey:key withTimeoutInterval:self.defaultTimeoutInterval];
}
- (void)setPlist:(id)plistObject forKey:(NSString*)key withTimeoutInterval:(NSTimeInterval)timeoutInterval; {
// Binary plists are used over XML for better performance
NSData* plistData = [NSPropertyListSerialization dataFromPropertyList:plistObject
format:NSPropertyListBinaryFormat_v1_0
errorDescription:NULL];
[self setData:plistData forKey:key withTimeoutInterval:timeoutInterval];
}
#pragma mark -
#pragma mark Disk writing operations
- (void)performDiskWriteOperation:(NSInvocation *)invoction {
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithInvocation:invoction];
[diskOperationQueue addOperation:operation];
[operation release];
}
#pragma mark -
- (void)dealloc {
[diskOperationQueue release];
[cacheDictionary release];
[super dealloc];
}
@end
3.使用方法：
[[EGOCache currentCache]setString:@"xxxxx" forKey:@"xxxxx"]; //设置
[[EGOCache currentCache]removeCacheForKey:@"xxxxx"]; //删除
[[EGOCache currentCache]stringForKey:@"xxxxx"];//获取