iOS的json字符串与数组和字典之间的转换

//把json字符串转化成数组或者字典

+(id)parseJSONStringToNSDictionary:(NSString *)JSONString {

NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];

NSError *error = nil;

id jsonObject = [NSJSONSerialization

JSONObjectWithData:JSONData options:NSJSONReadingAllowFragments

error:&error];

if (jsonObject != nil && error == nil){

NSLog(@"反序列化成功...");

if ([jsonObject isKindOfClass:[NSDictionary class]]){

NSDictionary *deserializedDictionary = (NSDictionary *)jsonObject;

NSLog(@"反序列化后的dictionary数据 = %@", deserializedDictionary);

return deserializedDictionary;

}

else if ([jsonObject isKindOfClass:[NSArray class]]){

NSArray *deserializedArray = (NSArray *)jsonObject;

NSLog(@"反序列化json后的数组 = %@", deserializedArray);

return deserializedArray;

}else {

return nil;

}

}else{

NSLog(@"%@", error);

NSLog(@"反序列化时发生一个错误");

return nil;

}

}

//返回的数据NSData转json，然后解析

#pragma mark -- AES 解密（用户密钥）--

NSString *decryptedText = [AESCipher decryptAES:encodedString key:[defaults objectForKey:@"userPriKey"]];

NSLog(@"浏览历史data解密：%@",decryptedText);

、、、、、、、、、、、、、、、、、

NSData *data = [decryptedText dataUsingEncoding:NSUTF8StringEncoding];

id dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves error:nil];

、、、、、、、、、、、、、、、、、、、、

HistoryViewController *historyVC = [[HistoryViewController alloc]init];

UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:historyVC];

historyVC.dataArr = dict;

NSLog(@"转码后的数组%@",dict);

、、、、、、、、、、、、、、、、、、、

NSMutableArray *topLevelArray = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

for (NSDictionary *dic in topLevelArray) {

historyVC.hisId = [NSString stringWithFormat:@"%@",dic[@"vId"]] ;

NSLog(@"转码后的hisId:%@",dic[@"vId"]);

}

//字典转字符串：

NSDictionary *messageDic = [NSDictionary dictionaryWithObjectsAndKeys:self.placeTF.text,@"cityFrom",@"",@"destination",@"2017-02",@"depDate",self.peopleTF.text,@"pNum",self.dayTF.text,@"dNum",@"",@"hotel",@"",@"tType",self.OtherTextView.text,@"oInfo",self.budgetTF.text,@"budget",@"0",@"isAbout", nil];

NSLog(@"所有信息%@",messageDic);

NSDictionary *dic = messageDic;

NSData *data = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil];

NSString *messageStr = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

NSLog(@"字典转成字符串messageStr：%@",messageStr);