如何从目标 c 中的 NSMutablearray 中删除空值？

Question

由于我正在使用 json Web 服务并将值存储在 NSMutablearray 中，但我得到了 Null 响应。现在我想删除该 null 值并将其替换为空。谁能帮我解决这个错误。

(
        {
        Aadhar =1123323244;
        AddressProofCopy = "<null>";
        Advertisement = "<null>";
        AgreementCopy = "<null>";
        ApCity = ggg;
        ApDistrict = g;
        ApDoorNo = g;
        ApFGFirstName = v;
        ApFGSurName = g;
        ApGender = F;
        ApPIN = 12323;
        ApStreet = h;
        AppStatus = "<null>";
        ApplRefStageStatus = N;
        ApplicantFirstName = g;
        ApplicantPhoto = "<null>";
        ApplicantSurName = g;
        ApplicationDate = "2018-09-06T00:00:00.000Z";
        ApplicationType = New;
        BuldingType = "<null>";
        District = 132424;
        DistrictId = 11;
        DocVerifiedBy = "<null>";
        DocVerifiedDate = "<null>";
        DocVerifiedMessage = "<null>";
        DocVerifiedStatus = "<null>";
    }
)

Answer 1

请验证此链接。https://github.com/bismasaeed00/NullReplacer 对我来说工作正常。

试试这个..

#import "NSArray+NullReplacement.h"
#import "NSDictionary+NullReplacement.h"

之后，使用以下行传递您的字典/数组 JSON 响应，

NSArray *newvalue = [yourarrayresponse arrayByReplacingNullsWithBlanks];

或

NSDictionary *newvalue = [yourdictionary dictionaryByReplacingNullsWithBlanks];

如果遇到任何错误，请添加

#import "NSArray+NullReplacement.h"

在 NSDictionary+NullReplacement 类和

#import "NSDictionary+NullReplacement.h" 

在 NSDictionary+NullReplacement 类文件中。

Answer 2

for(NSDictionary *dic in array)
{
for (NSString *key in dictionar.allKeys)
{
    if ([[dictionary objectForKey:key] isKindOfClass:[NSNull class]])
    {
        [dictionary setObject:@"" forKey:key];
    }

}
}

Answer 3

这不是空值，而是带有值/字符 "<null>" 的字符串。

这是完整的示例工作代码。你可以使用这个：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    NSMutableDictionary *mutableDict = [[NSMutableDictionary alloc] initWithObjectsAndKeys:
                                        @"1123323244",@"Aadhar",
                                        @"<null>",@"AddressProofCopy",
                                        nil];
    NSArray * array = [NSArray arrayWithObject:mutableDict];

    for(NSDictionary *dic in array)
        {
            for (NSString *key in dic.allKeys)
            {
                if ([[dic valueForKey:key] isEqualToString:@"<null>"])
                {
                    [mutableDict setObject:@"" forKey:key];
                }

            }
        }

    NSLog(@"Updated dict - %@", mutableDict);
}

@end

输出：