尝试访问值时出现 Nsdictionary 键值编码错误

Question

{
  "gender" : "Male",
  "city" : "chenna",
  "instituteName" : "srm",
    "profileImage" : "ProfileImage",
    "dob" : "DOB",
     "emailAddress" : "saxasx",
  "isStudent" : "true",
 "studentIdValidity" : "Month2Year5",
"studentIdImage" : "IDImage",
 "name" : "xasx",
 "phoneNumber" : "9092256227"
}

     NSDictionary *dic ;
dic = [[NSUserDefaults standardUserDefaults]objectForKey:@"fizzstudentjson"];

    NSLog(@"%@",dic);

NSString *strng = [dic objectForKey:@"city"];
NSLog(@"%@",strng);

当我尝试访问字符串中的字典值时我的应用程序崩溃了这是我写的代码帮助我

Answer 1

这对我有用。

NSDictionary *dictionary = @{
    @"gender" : @"Male",
    @"city" : @"chenna",
    @"instituteName" : @"srm",
    @"profileImage" : @"ProfileImage",
    @"dob" : @"DOB",
    @"emailAddress" : @"saxasx",
    @"isStudent" : @"true",
    @"studentIdValidity" : @"Month2Year5",
    @"studentIdImage" : @"IDImage",
    @"name" : @"xasx",
    @"phoneNumber" : @"9092256227"
    };

[[NSUserDefaults standardUserDefaults] setObject:dictionary forKey:@"fizzstudentjson"];

NSDictionary *dic = [[NSUserDefaults standardUserDefaults]objectForKey:@"fizzstudentjson"];

NSLog(@"%@",dic);

NSString *strng = [dic valueForKey:@"city"];
NSLog(@"%@",strong);

结果：chenna

Answer 2

as Log about data 它可能是 NSString 格式，而不是 NSDictionary。所以你需要在使用前将它转换为 NSDictionary。试试这个代码

    NSString *fizzstudentjson = [[NSUserDefaults standardUserDefaults]objectForKey:@"fizzstudentjson"];

    NSData *data = [fizzstudentjson dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

    NSString *city = dictionary[@"city"];

尝试访问值时出现 Nsdictionary 键值编码错误

Nsdictionay keyvalue coding error when trying to access the values

objective-c

nsdictionary

nsstring

ios