基于jsonkit，缓存（缓存对象 是服务器返回的整个json字符串）工具类，

#import "CacheUtil.h"

#import "JSONKit.h"

 

@implementation CacheUtil

 

//获得访问目录

+ (NSString*)documentPath

{

    NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,    NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    return documentsDirectory;

}

 

／／写缓存

+ (void)writeCache:(id)json ofType:(NSString *)type

{

    NSString* content = [json JSONString];

    [content writeToFile:[[CacheUtildocumentPath] stringByAppendingPathComponent:type] atomically:YESencoding:NSUTF8StringEncodingerror:nil];

}

 

／／读缓存 

+ (id)readCacheOfType:(NSString *)type

{

    NSString* path = [[CacheUtildocumentPath] stringByAppendingPathComponent:type];

    if (![[NSFileManagerdefaultManager] fileExistsAtPath:path]) {

        return nil;

    }

    NSError* error;

    NSData* content = [[NSData alloc] initWithContentsOfFile:path];

    if (error) {

        return nil;

    }

    id json = [content objectFromJSONData];

    return json;

}

 

／／清除缓存

+ (void)clearCacheOfType:(NSString*)type

{

    NSString* path = [[CacheUtildocumentPath] stringByAppendingPathComponent:type];

    if ([[NSFileManagerdefaultManager] fileExistsAtPath:path]) {

        [[NSFileManagerdefaultManager] removeItemAtPath:path error:nil];

    }

}

 

@end