1 字符串转数组

将string字符串转换为array数组

NSString *str = [NSString stringWithFormat:@"A8ENKIL5BCSSD5S32DFWEAE==,20180507"];
//将array数组转换为string字符串
 NSArray  *array = [str componentsSeparatedByString:@","];

2 json字符串 转字典

+ (NSDictionary *)JsonStringToDictionary:(NSString *)jsonString {
    if (jsonString == nil) {
        return nil;
    }
    
    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSError *err;
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData
                                                        options:NSJSONReadingMutableContainers
                                                          error:&err];
    if(err) {
        NSLog(@"json解析失败：%@",err);
        return nil;
    }
    return dic;
}