我正在尝试使用 json 从数据库获取数据。在我使用 json 解析器获取数据之前，该程序可以运行，但是当我使用解析器时，该程序崩溃了。有什么问题吗？ json 和 peopleList 都是 NSMutableArray。您可以在此处找到 json 的缩短版本:
{"persons":[{"id":3,"name":"Micke","userId":2,"expectations":"None","skills":"Many","description":"Yes I want to want","experience":"From everywhere","created_at":"2013-09-27T07:48:55.612Z","updated_at":"2013-09-27T07:48:55.612Z"}]}
代码如下:
{
NSURL *url = [NSURL URLWithString:getDataURL];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
peopleList = [[NSMutableArray alloc]init];
for (int i =0; i<json.count; i++) {
NSString * pId = [[json objectAtIndex:i]objectForKey:@"id"];
NSString * pName = [[json objectAtIndex:i]objectForKey:@"name"];
NSString * pUserId = [[json objectAtIndex:i]objectForKey:@"userId"];
NSString * pExpectations = [[json objectAtIndex:i]objectForKey:@"expectations"];
NSString * pSkills = [[json objectAtIndex:i]objectForKey:@"skills"];
NSString * pDescription = [[json objectAtIndex:i]objectForKey:@"description"];
NSString * pExperience = [[json objectAtIndex:i]objectForKey:@"experience"];
NSString * pCreatedAt = [[json objectAtIndex:i]objectForKey:@"created_at"];
NSString * pUpdatedAt = [[json objectAtIndex:i]objectForKey:@"updated_at"];
Person *person = [[Person alloc]
initWithID:pId andName:pName andUserId:pUserId andExpectations:pExpectations andSkills:pSkills andDescription:pDescription andExperience:pExperience andCreated_at:pCreatedAt andUpdated_at:pUpdatedAt];
[peopleList addObject:person];
}
}
错误开始于:
2013-11-13 19:26:51.644 FENA[1664:70b] -[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x109088fc0
2013-11-13 19:26:51.651 FENA[1664:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x109088fc0'
最佳答案
你有字典的字典所以试试这个
NSString * pId = [[[json objectForKey:@"persons"] objectAtIndex:i] objectForKey:@"id"];
...
关于iOS json解析器错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19952899/