从Json响应中获取数据时遇到问题。
以下是一个示例数据结构：
(
{
AT = "<null>";
DId = 0;
DO = 0;
PLId = 33997;
PdCatList = (
{
PLId = 33997;
PPCId = 0;
pdList = (
{
IsDis = 0;
IsPS = 0;
IsT = 1;
PA = 1;
PCId = 119777;
}
);
}
);
PdId = 0;
SId = 0;
Sec = 1;
},
{
AT = "<null>";
DId = 0;
DO = 11;
Dis = 0;
PLId = 34006;
PdCatList = (
{
PLId = 34006;
PPCId = 0;
pdList = (
{
IsDis = 0;
IsPS = 0;
IsT = 1;
PA = 1;
PCId = 119830;
},
{
IsDis = 0;
IsPS = 0;
IsT = 1;
PA = 1;
PCId = 119777;
}
);
},
{
PLId = 33997;
PPCId = 0;
pdList = (
{
IsDis = 0;
IsPS = 0;
IsT = 1;
PA = 1;
PCId = 119777;
}
);
}
);
PdId = 0;
SId = 0;
Sec = 1;
},
)
我将如何解析生成的结构？ 我想直接得到一个值列表。如果我在tupel中有多个值，例如执行者PdCatList，pdList，该怎么办？我将如何访问这些值？ 任何人都可以帮助我
感谢的
我的代码是
NSError *error;
Array1 = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
for(int i=0;i<[Array1 count];i++)
{
NSDictionary *dict1 = [Array1 objectAtIndex:i];
NSLog(@"Array1.....%@",dict1);
Array2=[dict1 valueForKey:@"PdCatList"];
for(int i=0;i<[Array2 count];i++)
{
NSDictionary *dict2 = [Array2 objectAtIndex:i];
NSLog(@"Array2.....%@",dict2);
Array3=[dict2 valueForKey:@"pdList"];
for(int i=0;i<[Array3 count];i++)
{
NSDictionary *dict3 = [Array3 objectAtIndex:i];
NSLog(@"Array3.....%@",dict3);
}
}
}
答案 0 :(得分：3)
试试这个......
NSError *error;
Array1 = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
for(int i=0;i<[Array1 count];i++)
{
NSDictionary *dict1 = [Array1 objectAtIndex:i];
ATArray =[dict1 valueForKey:@"AT"];
DIdArray =[dict1 valueForKey:@"DId"];
DOArray =[dict1 valueForKey:@"DO"];
PLIdArray =[dict1 valueForKey:@"PLId"];
etc...
Array2=[dict1 valueForKey:@"PdCatList"];
for(int i=0;i<[Array2 count];i++)
{
NSDictionary *dict2 = [Array2 objectAtIndex:i];
PLIdArray =[dict2 valueForKey:@"PLId"];
PPCIdArray =[dict2 valueForKey:@"PPCId"];
etc…
Array3=[dict2 valueForKey:@"pdList"];
for(int i=0;i<[Array3 count];i++)
{
NSDictionary *dict3 = [Array3 objectAtIndex:i];
IsDisArray =[dict3 valueForKey:@"IsDis"];
IsPSArray =[dict3 valueForKey:@"IsPS"];
IsTArray =[dict3 valueForKey:@"IsT"];
PAArray =[dict3 valueForKey:@"PA"];
PCIdArray =[dict3 valueForKey:@"PCId"];
}
}
}
答案 1 :(得分：2)
我认为您需要的是了解JSON响应是什么，而不是从JSON响应中获取某些对象的值的答案。
如果您想了解有关JSON解析的详细说明，那么您可以查看NSJSONSerialization Class Reference。一切都在那里，或者你可以看看我的Answer。
理解概念。这取决于你JSON中的内容。如果它是一个数组（[ ]内的值），那么你必须保存在NSArray，如果它是一个字典（{ }内的值），那么保存为NSDictionary如果你有单个值如string，integer，double则必须使用适当的Objective-C数据类型保存它们。
有关示例的一些简单细节，您可以从此问题中查看我的Answer。
答案 2 :(得分：1)
使用JSONKit（https://github.com/johnezang/JSONKit）：
NSString *yourJSONString = ...
NSArray *responseArray = [yourJSONString objectFromJSONString];
for(NSDictionary *responseDictionary in responseArray)
{
NSString *atString = [responseDictionary objectForKey:@"AT"];
...
NSArray *pdCatListArray = [responseDictionary objectForKey:@"PdCatList"];
...here you can get all values you want,if you want to get more details in PdCatList,use for in pdCatListArray ,you can do what you want.
}
答案 3 :(得分：1)
Use following method:
NSDictionary *mainDict;
SBJSON *jsonParser = [[SBJSON alloc]init];
if([[jsonParser objectWithString:responseString] isKindOfClass:[NSDictionary class]])
{
mainDict=[[NSDictionary alloc]initWithDictionary:[jsonParser objectWithString:responseString]];
}
NSDictionary *firstDict=[NSDictionary alloc]initWithDictionary:[mainDict valueForKey:@""];
答案 4 :(得分：0)
您必须将解析字符串中的JSON框架添加到NSDictionary中。 使用here
中的zip文件导入标题文件，如下所示，在您要解析JSON字符串的控制器中。
#import "SBJSON.h"
#import "NSString+SBJSON.h"
现在，将您的回复字符串解析为 NSDictionary ，如下所示。
NSMutableDictionary *dictResponse = [strResponse JSONValue];
答案 5 :(得分：0)
您可以使用KVC 访问JSON中的嵌套属性。您需要了解KVC and dot syntax和Collection operators
将JSON映射到对象（例如RestKit）的框架在很大程度上依赖于KVC。
根据您的示例，您可以获得所有PdCatList对象的列表：
//sample data
NSArray *json = @[
@{@"PLId" : @33997,
@"PdCatList" : @{@"PLId": @33998,
@"PPCId" : @1,
@"pdList" : @{
@"PCId" : @119777
}}
},
@{@"PLId" : @33999,
@"PdCatList" : @{@"PLId": @4444,
@"PPCId" : @0,
@"pdList" : @{
@"PCId" : @7777
}}}
];
//KVC
NSArray *pdCatLists = [json valueForKeyPath:@"@unionOfObjects.PdCatList"];
有了这个，你可以做一个非常基本的对象映射（不关心关系）
在PdCatList.h中
@interface PdCatList : NSObject
@property (readonly, strong, nonatomic) NSNumber *PLId;
@property (readonly, strong, nonatomic) NSNumber *PPCId;
+ (instancetype)listWithDictionary:(NSDictionary *)aDictionary;
@end
在PdCatList.m
@implementation PdCatList
- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
@try {
[super setValue:value forUndefinedKey:key];
}
@catch (NSException *exception) {
NSLog(@"error setting undefined key: %@, exception: %@", key, exception);
};
}
+ (id)listWithDictionary:(NSDictionary *)aDictionary
{
PdCatList *result = [[self alloc] init];
[result setValuesForKeysWithDictionary:aDictionary];
return result;
}
@end
获取json对象后
NSArray *pdCatLists = [json valueForKeyPath:@"@unionOfObjects.PdCatList"];
[pdCatLists enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
PdCatList *each = [PdCatList listWithDictionary:obj];
}];
但是，如果你想要的只是展平json，你必须使用递归并创建一个类似于以下的类别。
在NSJSONSerialization + FlattenedJSON.h
@interface NSJSONSerialization (FlattenedJSON)
+ (void)FlattenedJSONObjectWithData:(NSData *)data completionSuccessBlock:(void(^)(id aJson))onSuccess failure:(void(^)(NSError *anError))onFailure;
@end
在NSJSONSerialization + FlattenedJSON.m
中#import "NSJSONSerialization+FlattenedJSON.h"
@implementation NSJSONSerialization (FlattenedJSON)
+ (void)FlattenedJSONObjectWithData:(NSData *)data completionSuccessBlock:(void (^)(id))onSuccess failure:(void (^)(NSError *))onFailure
{
NSError *error;
id object = [self JSONObjectWithData:data
options:kNilOptions
error:&error];
if (error)
{
onFailure(error);
}
else
{
NSMutableArray *result = [NSMutableArray array];
[self flatten:object
inArray:result];
onSuccess([result copy]);
}
}
+ (void)flatten:(id)anObject inArray:(NSMutableArray *)anArray
{
if ([anObject isKindOfClass:NSDictionary.class])
{
[((NSDictionary *)anObject) enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
[self flatten:obj inArray:anArray];
}];
}
else if ([anObject isKindOfClass:NSArray.class])
{
[((NSArray *)anObject) enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
[self flatten:obj inArray:anArray];
}];
}
else
{
[anArray addObject:anObject];
}
}
@end