我正在尝试从 API 调用中获取一些数据并将这些对象映射到模型对象。就我而言,我在一个对象中有一个对象。这是工作并收到 JSON。它与第一个对象的映射很好。在我的 JSON 中,我有一个数组和另一个数组。所以我做了以下事情来完成这项工作。
对象映射
+(NSArray *)fromJSONNSDictionary *)objectNotation errorNSError *__autoreleasing *)error{
NSError *localError = nil;
NSDictionary *parsedObject = [[NSDictionary alloc] initWithDictionarybjectNotation];
if (localError != nil) {
*error = localError;
return nil;
}
NSMutableArray *posts = [[NSMutableArray alloc] init];
NSArray *results = [parsedObject valueForKey"data"];
NSLog(@"Count %lu", (unsigned long)results.count);
for (NSDictionary *groupDic in results) {
Post *post = [[Post alloc] init];
post.postBody = [NSMutableArray array];
for (NSString *key in groupDic) {
if ([post respondsToSelector:NSSelectorFromString(key)]) {
[post setValue:[groupDic valueForKey:key] forKey:key];
}
}
[posts addObject:post];
}
return posts;
}
由于 for 循环,这个生成的元数据比我预期的要多。
模型类
@interface OCPost : NSObject
@property(nonatomic) NSInteger postId;
@property(nonatomic) NSInteger userId;
@property(nonatomic) NSInteger points;
@property(strong, nonatomic) NSMutableArray *body;
@end
我想将 body 数组映射到 Body 对象数组。在我的 body 课上
@interface Body : NSObject
@property (strong, nonatomic) NSString *value;
@property (strong, nonatomic) NSString *name;
@property (strong, nonatomic) NSMutableArray *metaData;
@end
元数据 也应该与以下对象映射。
@interface MetaData : NSObject
@property (strong, nonatomic) NSString *title;
@property (strong, nonatomic) NSString *metaDataDescription;
@end
我怎样才能制作一个像,
Post
|_Body1
| |_MetaData1
| |_MetaData2
| |_MetaData3
|_Body3
| |_MetaData1
| |_MetaData2
请帮忙。
JSON
{
"message": "ost ",
"data": [
{
"postId": 1,
"timestamp": "2016-06-14 22:37:02",
"body": [
{
"textId": 1,
"type": "link",
"deleting": false,
"metaData": [
{
"metadataId": 1,
"type": "text",
"value": "under "
}
]
},
{
"textId": 2,
"type": "department",
"deleting": false,
"metaData": [
{
"metadataId": 2,
"type": "text",
"value": "under "
}
]
}
]
}
]
}
Best Answer-推荐答案 strong>
好的,您可以手动解析 JSON 并将其映射到您的数据模型。
这是你可以做到的:
+(NSArray *)fromJSONNSDictionary *)objectNotation errorNSError *__autoreleasing *)error{
NSError *localError = nil;
NSDictionary *parsedObject = [[NSDictionary alloc] initWithDictionary: objectNotation];
if (localError != nil) {
*error = localError;
return nil;
}
NSMutableArray *posts = [[NSMutableArray alloc] init];
NSArray *results = [parsedObject valueForKey"data"];
NSLog(@"Count %lu", (unsigned long)results.count);
for (NSDictionary *groupDic in results) {
OCPost *post = [[OCPost alloc] init];
post.body = [NSMutableArray array];
//1. Parse bodies
NSArray *bodies = groupDic[@"body"];
for (NSDictionary *aBody in bodies) {
Body *body = [[Body alloc] init];
body.value = aBody[@"textId"];
body.name = aBody[@"type"];
body.metaData = [@[] mutableCopy];
//2. Parse metadatas
NSArray *metadatasOfBody = aBody[@"metaData"];
for (NSDictionary *aMetadata in metadatasOfBody) {
MetaData *metadata = [[MetaData alloc] init];
metadata.title = aMetadata[@"type"];
metadata.metaDataDescription = aMetadata[@"value"];
//3. Add metadata to body
[body.metaData addObject:metadata];
}
//4. Add body to post
[post.body addObject: body];
}
//Logs to check post body and body metadata
NSLog(@"post %@", post);
NSLog(@"post body %@", post.body);
for (Body *body in post.body) {
NSLog(@"post body metadata %@", body.metaData);
}
//5. Add post to posts
[posts addObject: post];
}
//Log to check return posts
NSLog(@"posts %@", posts);
return posts;
}
要对其进行测试,您可以将 JSON 表示为 NSDictionary,如下所示:
- (NSDictionary*) aJSON
{
return @{
@"message": @"ost ",
@"data": @[
@{
@"postId": @1,
@"timestamp": @"2016-06-14 22:37:02",
@"body": @[
@{
@"textId": @1,
@"type": @"link",
@"deleting": @false,
@"metaData": @[
@{
@"metadataId": @1,
@"type": @"text",
@"value": @"under "
}
]
},
@{
@"textId": @2,
@"type": @"department",
@"deleting": @false,
@"metaData": @[
@{
@"metadataId": @2,
@"type": @"text",
@"value": @"under "
}
]
}
]
}
]
};
}
将 objectNotation 替换为 [self aJSON] 以便能够在不调用服务器 API 的情况下测试映射,当然也可以调用服务器 API 端点,并尝试使用响应进行测试JSON。
关于ios - 如何在对象内映射 JSON 数据对象?,我们在Stack Overflow上找到一个类似的问题:
https://stackoverflow.com/questions/37846858/
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