如何在 iOS 中将字符串转换为 NSArray

Question

我有一个 JSON 对象，它有一个像这样的键值对

"AttachedDocument": "[{\"DocumentId\":354,\"DocumentName\":\"Screenshot_2016-04-15-00-35-11.png\",\"DocumentType\":\"image/png\"}]"

这个值是一个字符串。我怎样才能把它转换成 NSArray

完整对象

{
    "LeaveEntryCode": 0, 
    "RequestId": 0, 
    "EmployeeCode": 17186, 
    "LeaveYear": 2016, 
    "LeaveTypeCode": 1, 
    "LeaveReasonCode": 0, 
    "BaseType": "ess", 
    "StartDate": "2016-10-24T00:00:00", 
    "EndDate": "2016-10-24T00:00:00", 
    "NoOfDays": 1, 
    "StartDateSession": "full", 
    "EndDateSession": "full", 
    "PreApproved": false, 
    "ForDate": "1901-01-01T00:00:00", 
    "Remarks": "test from Android", 
    "CoveringPersonCode": 0, 
    "AttachedDocument": "[{\"DocumentId\":354,\"DocumentName\":\"Screenshot_2016-04-15-00-35-11.png\",\"DocumentType\":\"image/png\"}]", 
    "RequestStatus": "P", 
    "Deleted": false, 
    "Status": false, 
    "CreatedBy": 0, 
    "CreatedDate": "0001-01-01T00:00:00", 
    "UpdatedBy": 0, 
    "UpdatedDate": "0001-01-01T00:00:00", 
    "DeletedBy": 0, 
    "DeletedDate": "0001-01-01T00:00:00", 
    "ModuleId": 2, 
    "ObjectId": 20, 
    "StartDateString": "10/24/2016", 
    "EndDateString": "10/24/2016", 
    "LeaveDayList": [
        "10/24/2016-FH,10/24/2016-SH"
    ], 
    "SystemLeaveTypeCode": "ANN", 
    "LeaveTypeName": "ANNUAL", 
    "Employee": null, 
    "LieuDayList": null, 
    "BaseLeaveType": "ANN", 
    "CoveringPersonName": null, 
    "LeaveReasonName": "test", 
    "DocumentSource": "LEAVE"
}

这是我得到的完整 JSON 对象。我是通过网络服务获取的。

Answer 1

实际上您得到的是 josn string 作为响应，因此您可以将其转换为 josn object 类似

 NSString *yourString = @"[{\"DocumentId\":354,\"DocumentName\":\"Screenshot_2016-04-15-00-35-11.png\",\"DocumentType\":\"image/png\"}]";

NSError *error;
NSData *data = [yourString dataUsingEncoding:NSUTF8StringEncoding];
NSArray *jsonObject = [NSJSONSerialization JSONObjectWithData:data
                                  options:NSJSONReadingMutableContainers 
                                    error:&error];

   NSLog(@"json object : %@",jsonObject);

此处yourString表示AttachedDocument键的对象！

如何在 iOS 中将字符串转换为 NSArray

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