檢查目標C中的Json響應的空值

[ 
    { 
    "AT" : null, 
    "EA" : null, 
    "AD2" : "", 
    "OP" : null, 
    "AdsLst" : [ 

    ], 
    "EMs" : null, 
    "ND" : { 
     "MN" : null, 
     "FN" : "Sony", 
     "LN" : "J" 
    }, 
    "ZP" : "23456", 
    "CT" : 1, 
    "PP" : 0, 
    "cId" : 161464, 
    "Pos" : null, 
    "WPExt" : null, 
    "OS" : 0, 
    "HP" : "(345) 678-7890", 
    "BTTC" : 0, 
    "PWD" : null, 
    "UId" : 627, 
    "DId" : 0, 
    "UN" : null, 
    "CY" : "Salt lake", 
    "Comp" : null, 
    "PMC" : 0, 
    "AEa" : null, 
    "AnD" : null, 
    "DOB" : "1\/05\/1979", 
    "IDel" : false, 
    "ST" : "UH", 
    "AD" : "2345 Symonds street", 
    "Mob" : null, 
    "WP" : "(234) 324-6576", 
    "PL" : 0, 
    "Potcus" : false 
    }, 
    { 
    "AT" : null, 
    "EA" : null, 
    "AD2" : "", 
    "OP" : null, 
    "AdsLst" : [ 

    ], 
    "EMs" : null, 
    "ND" : { 
     "MN" : null, 
     "FN" : "Augustine", 
     "LN" : "Gomes" 
    }, 
    "ZP" : "43567", 
    "CT" : 1, 
    "PP" : 0, 
    "cId" : 161466, 
    "Pos" : null, 
    "WPExt" : null, 
    "OS" : 0, 
    "HP" : "(456) 457-6588", 
    "BTTC" : 0, 
    "PWD" : null, 
    "UId" : 627, 
    "DId" : 0, 
    "UN" : null, 
    "CY" : "test", 
    "Comp" : null, 
    "PMC" : 0, 
    "AEa" : null, 
    "AnD" : null, 
    "DOB" : null, 
    "IDel" : false, 
    "ST" : "AZ", 
    "AD" : "2345 test", 
    "Mob" : null, 
    "WP" : "(678) 987-0890", 
    "PL" : 0, 
    "Potcus" : false 
    }, 
    { 
    "AT" : null, 
    "EA" : null, 
    "AD2" : "", 
    "OP" : null, 
    "AdsLst" : [ 

    ], 
    "EMs" : null, 
    "ND" : { 
     "MN" : null, 
     "FN" : "Jenny", 
     "LN" : "X" 
    }, 
    "ZP" : "45678", 
    "CT" : 1, 
    "PP" : 0, 
    "cId" : 161467, 
    "Pos" : null, 
    "WPExt" : null, 
    "OS" : 0, 
    "HP" : "(435) 644-6545", 
    "BTTC" : 0, 
    "PWD" : null, 
    "UId" : 627, 
    "DId" : 0, 
    "UN" : null, 
    "CY" : "Sallas", 
    "Comp" : null, 
    "PMC" : 0, 
    "AEa" : null, 
    "AnD" : null, 
    "DOB" : null, 
    "IDel" : false, 
    "ST" : "TX", 
    "AD" : "2433 Main street", 
    "Mob" : null, 
    "WP" : "(657) 656-8798", 
    "PL" : 0, 
    "Potcus" : false 
    }, 
    { 
    "AT" : null, 
    "EA" : null, 
    "AD2" : "", 
    "OP" : null, 
    "AdsLst" : [ 

    ], 
    "EMs" : null, 
    "ND" : { 
     "MN" : null, 
     "FN" : "BLVD Cont F1", 
     "LN" : "Blvd Contact L1" 
    }, 
    "ZP" : "", 
    "CT" : 1, 
    "PP" : 0, 
    "cId" : 161473, 
    "Pos" : null, 
    "WPExt" : null, 
    "OS" : 0, 
    "HP" : null, 
    "BTTC" : 0, 
    "PWD" : null, 
    "UId" : 627, 
    "DId" : 0, 
    "UN" : null, 
    "CY" : "", 
    "Comp" : null, 
    "PMC" : 0, 
    "AEa" : null, 
    "AnD" : null, 
    "DOB" : null, 
    "IDel" : false, 
    "ST" : "", 
    "AD" : "", 
    "Mob" : null, 
    "WP" : null, 
    "PL" : 0, 
    "Potcus" : false 
    },

在此響應中，我只想顯示「FN」，「LN」，「CT」，「PP」，「cId」，「Pos」，「 AT」，‘EA’，‘AD2’這些標籤值....然後是空值只是想顯示‘蘋果’......檢查目標C中的Json響應的空值

誰能幫助我

我的代碼是

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 

    NSError *error; 
    json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error]; 
    NSLog(@"json.... %@",json); 


    id jsonObject = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingAllowFragments error:nil]; 

    NSLog(@"jsonObject=%@", jsonObject); 

    NSDictionary *checkArray=[jsonObject valueForKey:@"ND"]; 


    cheDisk=[checkArray valueForKey:@"FN"]; 
    cheDisk1=[checkArray valueForKey:@"LN"]; 

    NSLog(@"FN =%@",cheDisk); 
    NSLog(@"LN =%@",cheDisk1); 

}

來源

2013-05-21 Siva

犯錯，怎麼樣'如果（對象==無）文本= @ 「蘋果」;'？ – trojanfoe

我不確定我明白你想要做什麼？ – dreamlax

是...我想顯示「FN」，「LN」，「CT」，「PP」，「cId」，「Pos」，「AT」，「EA」，「AD2」這些標籤值... 。如果null意味着只顯示「蘋果」字符串 – Siva

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 


    NSError *error; 
    json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error]; 
    NSLog(@"json.... %@",json); 


    id jsonObject = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingAllowFragments error:nil]; 

    NSLog(@"jsonObject=%@", jsonObject); 

    NSDictionary *checkArray=[json valueForKey:@"ND"]; 


    NSArray *tel = [checkArray valueForKey:@"FN"]; 



    for (id photo in tel) 
    { 
     if (photo == [NSNull null]) 
     { 
      // photo is null 

     } 
     else 
     { 
      // photo isn't null. It's an array 
      NSArray *innerPhotos = photo; 
      NSLog(@"photo... %@",innerPhotos); 
     } 

    } 



    cheDisk1=[checkArray valueForKey:@"LN"]; 

    NSLog(@"FN =%@",tel); 


    [ContactTableview reloadData]; 


}

來源

2013-05-22 03:58:15 Siva

null是NSNull單例記錄的方式。所以：

if (cheDisk == [NSNull null]) { 
    // cheDisk is null 
}

來源

2013-05-21 10:55:07 Rushabh

希望這會有所幫助。

cheDisk=[checkArray valueForKey:@"FN"]; 
     cheDisk1=[checkArray valueForKey:@"LN"];. 

    if([cheDisk isEqualToString:@"null"]){ 
     cheDisk = @"Apple"; 
    } 
    if([cheDisk1 isEqualToString:@"null"]){ 
     cheDisk1 = @"Apple"; 
    } 


     NSLog(@"FN =%@",cheDisk); 
     NSLog(@"LN =%@",cheDisk1);

來源

2013-05-21 10:58:49 IronMan

你可以使用：

if (cheDisk isKindOfClass:[NSNull class]) { 
    // cheDisk is null 
}

希望這會幫助你。

所有最好的！

來源

2013-05-21 11:05:57 Yashesh

嘗試

objectForKey will return nil if a key doesn't exist 


    Symbol Value   Meaning 
    ======= ============= ========================================= 
    NULL  (void *)0  literal null value for C pointers 
    nil  (id)0   literal null value for Objective-C objects 
    Nil  (Class)0  literal null value for Objective-C classes 
    NSNull [NSNull null] singleton object used to represent null 


    NSString *strOP = [results objectForKeyOrNil:@"OP"]; 

- (id)objectForKeyOrNil:(id)key { 
    id val = [self objectForKey:key]; 
    if ([val isEqual:[NSNull null]] || val==nil) { 
     return nil; 
    } 

    return val; 
}

來源

2013-05-21 11:06:23

檢查目標C中的Json響應的空值

回答

相關問題