iOS之文件存储

将字典存储到沙盒中（文件名后缀.plist）

+ (void)saveData:(NSDictionary *)dictionary toFileName:(NSString *)fileName{
    NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documents = [array objectAtIndex:0];
    NSString *documnetPath = [documents stringByAppendingPathComponent:fileName];
    
    NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithDictionary:dictionary];
    //去除空的value  否则不能写入到plist文件中去
    for (NSString *key in [dic allKeys]) {
        if ([[dic valueForKey:key] isEqual:[NSNull null]] || [dic valueForKey:key] == nil) {     
            [dic removeObjectForKey:key];   
        }
    }
    //将字典存入指定的本地文件
    [dic writeToFile:documnetPath atomically:YES];
    NSLog(@"沙盒文件路径：%@", documnetPath);
    
}

从沙盒中读取字典数据

+ (NSDictionary *)readDataFromFileName:(NSString *)fileName{
    NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documents = [array objectAtIndex:0];
    NSString *documnetPath = [documents stringByAppendingPathComponent:fileName];
    
    NSDictionary *userDic;
    if([[NSFileManager defaultManager] fileExistsAtPath:documnetPath]){
       userDic = [[NSDictionary alloc] initWithContentsOfFile:documnetPath];
    }else{
        return nil;
    }
    return userDic;
}

删除沙盒文件

+ (void)deleteDataWithFileName:(NSString *)fileName{
    NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documents = [array objectAtIndex:0];
    NSString *documnetPath = [documents stringByAppendingPathComponent:fileName];
    [[NSFileManager defaultManager] fileExistsAtPath:documnetPath];
    
}