json转数组

- (NSDictionary *)dataArrayFromJson {
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"decoration" ofType:@"json"];
    NSString *jsonStr  = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
    if (jsonStr == nil) {
        return nil;
    }
    NSData *jsonData = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];
    NSError *error;
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];
    if (error) {
        return nil;
    }
    return dic;
}