IOS，我怎麼能循環爲DIC DIC在陣列替換空值空字符串

Question

與服務器數據返回它有它的

空值如何，我可以通過NSJSONSerialization空字符串替換空值還是別的嗎？

我的JSON數據：

{ 
person:{ 
     [{name:name1,.....},{name:name2,....}] 
     }, 
class:{ 
     [{classname:null,.....},{classname:classname2,....}] 
     } 
} 

感謝提前。

Answer 1

您通過Dictionary的鑰匙需要iterate有空值：

嘗試類似：

NSArray *keys= [json allKeys]; 
     for (NSString *keysV in keys){ 
      NSLog(@"Keys are %@", keysV); 
     if([[Your_Dict objectForKey: keysV] isEqual:[NSNull null]]){ 
     //Do your stuff here 
     } 
    } 

編輯：我沒有測試。

NSArray *keys= [json allKeys]; 
    for (NSString *keysV in keys){ 
     for(NSDictionary *subDict in [yourDict objectForKey: keysV]){ 
      NSArray *subKeys = [subDict allKeys]; 
      for (NSString *keysVv in subKeys){ 
       if([[subDict objectForKey: keysVv] isEqual:[NSNull null]]){ 
        //Do your stuff here 
       } 
      } 
     } 
} 

Answer 2

與我做了同樣的問題，我可以解決由數據轉換NSMutableDicrionary，我不斷地檢查數據若有空數據來我更換了與空字符串。 嘗試它可能會幫助你。

-(void)ConfigureCell:(int)Section :(int)Index :(NSMutableArray *)threadArray{ 
NSMutableDictionary *threadDict=[threadArray objectAtIndex:Index]; 

    if([[threadDict objectForKey:@"read"]boolValue]){ 

    } 
    CGRect subjectLabelSize; 
    self.contactNameLabel.text=@"1323123123123"; 
    self.lastMessageLabel.text=[threadDict objectForKey:@"lastMessage"]; 
    if ([[threadDict objectForKey:@"subject"] isEqual:[NSNull null]]) { 
     self.subjectLabel.text=@""; 
    } 
} 

Answer 3

創造生命時間範疇更換空

創建類別（換上黑色的空間空字符串）

的NSDictionary + NullReplacement.h

#import <Foundation/Foundation.h> 
@interface NSDictionary (NullReplacement) 
- (NSDictionary *)dictionaryByReplacingNullsWithBlanks; 
@end 

的NSDictionary + NullReplacement .M

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

@implementation NSDictionary (NullReplacement) 

- (NSDictionary *)dictionaryByReplacingNullsWithBlanks { 
    const NSMutableDictionary *replaced = [self mutableCopy]; 
    const id nul = [NSNull null]; 
    const NSString *blank = @""; 

    for (NSString *key in self) { 
     id object = [self objectForKey:key]; 
     if (object == nul) [replaced setObject:blank forKey:key]; 
     else if ([object isKindOfClass:[NSDictionary class]]) [replaced setObject:[object dictionaryByReplacingNullsWithBlanks] forKey:key]; 
     else if ([object isKindOfClass:[NSArray class]]) [replaced setObject:[object arrayByReplacingNullsWithBlanks] forKey:key]; 
    } 
    return [NSDictionary dictionaryWithDictionary:[replaced copy]]; 
} 

@end 

再創建一個類別（換上黑色的空間空數組）

的NSArray + NullReplacement.h

#import <Foundation/Foundation.h> 
@interface NSArray (NullReplacement) 
- (NSArray *)arrayByReplacingNullsWithBlanks; 
@end 

的NSArray + NullReplacement.m

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

@implementation NSArray (NullReplacement) 

- (NSArray *)arrayByReplacingNullsWithBlanks { 
    NSMutableArray *replaced = [self mutableCopy]; 
    const id nul = [NSNull null]; 
    const NSString *blank = @""; 
    for (int idx = 0; idx < [replaced count]; idx++) { 
     id object = [replaced objectAtIndex:idx]; 
     if (object == nul) [replaced replaceObjectAtIndex:idx withObject:blank]; 
     else if ([object isKindOfClass:[NSDictionary class]]) [replaced replaceObjectAtIndex:idx withObject:[object dictionaryByReplacingNullsWithBlanks]]; 
     else if ([object isKindOfClass:[NSArray class]]) [replaced replaceObjectAtIndex:idx withObject:[object arrayByReplacingNullsWithBlanks]]; 
    } 
    return [replaced copy]; 
} 

@end 

需要使用單一線路和享受無空字典

#import "NSDictionary+NullReplacement.h" 

NSDictionary * withoutNullResultDict=[resultDict dictionaryByReplacingNullsWithBlanks]; 

Answer 4

使用下面的代碼：

for (NSDictionary * test in Your_Array) 
      { 
       for (id dict in [test allKeys]) 
       { 
        ([test valueForKey:dict] == [NSNull null]) ? [test setValue:@"" forKey:dict] :[test setValue:[test valueForKey:dict] forKey:dict]; 
       } 
      }