如何将 NSStrings 的 NSArray 转换为 Json String iOS

Question

我有一个卷号数组

NSArray *rollArray = [NSArray arrayWithObjects:@"1", @"22", @"24", @"11", nil];

我需要在 Web 服务请求中发送这个数组

它的格式是这样的（JSON格式）

JSON 数据

{
  "existingRoll":["22","34","45","56"], // Array of roll numbers
  "deletedRoll":["20","34","44","56"] // Array of roll numbers
}

但我在将滚动数字数组 (rollArray) 转换为 json 字符串时遇到问题 以所需的格式。

我正在尝试这个

 NSMutableDictionary *postDict = [[NSMutableDictionary alloc]init];
  [postDict setValue:[rollArray componentsJoinedByString:@","] forKey:@"existingRoll"];

 NSString *str = [Self convertToJSONString:postDict]; // converts to json string

 NSData *jsonData = [NSJSONSerialization dataWithJSONObject:str options:0 error:nil];

 [request setHTTPBody:jsonData];

我使用的是 iOS 7

Answer 1

您可以使用以下方法从任何类型的 NSArray 中获取 Json 字符串：

NSArray *rollArray = [NSArray arrayWithObjects:@"1", @"22", @"24", @"11", nil];

NSData *data = [NSJSONSerialization dataWithJSONObject:rollArray options:0 error:nil];

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

NSLog(@"Json string is: %@", jsonString);

Answer 2

NSMutableDictionary *postDict = [[NSMutableDictionary alloc] init];

    [postDict setValue:@"Login" forKey:@"methodName"];
    [postDict setValue:@"admin" forKey:@"username"];
    [postDict setValue:@"12345" forKey:@"password"];
    [postDict setValue:@"mobile" forKey:@"clientType"];


    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:postDict options:0 error:nil];

    // Checking the format
    NSString *urlString =  [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];


    // Convert your data and set your request's HTTPBody property
    NSString *stringData = [[NSString alloc] initWithFormat:@"jsonRequest=%@", urlString];

    //@"jsonRequest={\"methodName\":\"Login\",\"username\":\"admin\",\"password\":\"12345\",\"clientType\":\"web\"}";

    NSData *requestBodyData = [stringData dataUsingEncoding:NSUTF8StringEncoding];

Answer 3

试试这个：

NSDictionary *object = @{
    @"existingRoll":@[@"22",@"34",@"45",@"56"],
    @"deletedRoll":@[@"20",@"34",@"44",@"56"]
};

if ([NSJSONSerialization isValidJSONObject:object]) {
    NSData* data = [ NSJSONSerialization dataWithJSONObject:object options:NSJSONWritingPrettyPrinted error:nil ];
    NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(str);
}

Answer 4

无需使用以下代码sn-ps：

1. [rollArray componentsJoinedByString:@","]
2. NSString *str = [Self convertToJSONString:postDict];

您可以使用以下代码创建 JSON：

NSArray *rollArray = [NSArray arrayWithObjects:@"1", @"22", @"24", @"11", nil];
NSMutableDictionary *postDict = [[NSMutableDictionary alloc]init];
[postDict setValue:rollArray forKey:@"existingRoll"];
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:postDict options:0 error:nil];

// Checking the format
NSLog(@"%@",[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]);