Iphone 如何从Objective-C中的Json响应中获取值
我在从Json响应中获取数据时遇到问题 以下是一个示例数据结构：Iphone 如何从Objective-C中的Json响应中获取值,iphone,ios,objective-c,json,ios5,Iphone,Ios,Objective C,Json,Ios5,我在从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; pd
(
{
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;
},
)
(
{
AT=“”；
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；
秒=1；
},
{
AT=“”；
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；
秒=1；
},
)
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);
}
}
}
NSError*错误；
Array1=[NSJSONSerialization JSONObjectWithData:responseData选项：针织错误：&错误]；
对于（inti=0；i，我认为这里需要的是理解JSON响应是什么，而不是从JSON响应中获取某些对象的值
如果你想要一些关于JSON解析的详细解释，那么你可以看一看。这里提供了所有信息，或者你可以看一看我的
理解这个概念。这取决于您的JSON
中包含的内容。如果它是数组（值在[]
中），那么您必须保存在NSArray
中，如果它是字典（值在{}
中）然后另存为NSDictionary
，如果您有单值，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，您可以从这个问题中查看my。使用JSONKit（）
您必须添加JSON框架，将字符串解析到NSDictionary中。
使用来自的zip文件
打开文件夹并将Classes文件夹重命名为“JSON”
复制JSON文件夹 ，并将其包含在项目中
导入头文件类似于控制器中的以下文件，您要在其中解析JSON字符串
#导入“SBJSON.h”
#导入“NSString+SBJSON.h”
现在，将响应字符串解析到NSDictionary，如下所示
NSMutableDictionary*dictResponse=[strResponse JSONValue]；
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"];
}
}
}
NSError*错误；
Array1=[NSJSONSerialization JSONObjectWithData:responseData选项：针织错误：&错误]；
对于（int i=0；i您可以使用
访问JSON中的嵌套属性。您需要了解和
将JSON映射到对象的框架，例如严重依赖KVC的框架
根据示例，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"];
例如，有了它，您可以创建一个非常基本的对象映射（不考虑关系）
在PdCatList.h中
@interface PdCatList : NSObject
@property (readonly, strong, nonatomic) NSNumber *PLId;
@property (readonly, strong, nonatomic) NSNumber *PPCId;
+ (instancetype)listWithDictionary:(NSDictionary *)aDictionary;
@end
@interface NSJSONSerialization (FlattenedJSON)
+ (void)FlattenedJSONObjectWithData:(NSData *)data completionSuccessBlock:(void(^)(id aJson))onSuccess failure:(void(^)(NSError *anError))onFailure;
@end
在PdCatList.m中
@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
#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
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，如果您只想展平json，则必须使用递归并创建类似于以下内容的类别
在NSJSONSerialization+flattedjson.h中
@interface PdCatList : NSObject
@property (readonly, strong, nonatomic) NSNumber *PLId;
@property (readonly, strong, nonatomic) NSNumber *PPCId;
+ (instancetype)listWithDictionary:(NSDictionary *)aDictionary;
@end
@interface NSJSONSerialization (FlattenedJSON)
+ (void)FlattenedJSONObjectWithData:(NSData *)data completionSuccessBlock:(void(^)(id aJson))onSuccess failure:(void(^)(NSError *anError))onFailure;
@end
在NSJSONSerialization+flattedjson.m中
@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
#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
我看到了你的问题，发现你总是为每一个新的JSON
响应提出一个新问题。for（int I=0；我看一下答案：。这可能会帮助你理解什么是JSON解析。亲爱的编辑和编辑审阅者，我刚刚了解了这一点，但你必须