私の状況では、通常、ResKitライブラリを使用してネットワーク層を設定しています。使いやすい構文解析を提供します。これにより、さまざまな応答やものに対するマッピングをセットアップする手間が軽減されます。
マッピングを自動的にセットアップするコードを追加するだけです。私はモデルの基本クラスを定義します（いくつかのメソッドが実装されているかどうかをチェックするコードが多く、モデル自体のコードが少ないため、プロトコルではありません）。
MappableEntry.h
@interface MappableEntity : NSObject
+ (NSArray*)pathPatterns;
+ (NSArray*)keyPathes;
+ (NSArray*)fieldsArrayForMapping;
+ (NSDictionary*)fieldsDictionaryForMapping;
+ (NSArray*)relationships;
@end
MappableEntry.m
@implementation MappableEntity
+(NSArray*)pathPatterns {
return @[];
}
+(NSArray*)keyPathes {
return nil;
}
+(NSArray*)fieldsArrayForMapping {
return @[];
}
+(NSDictionary*)fieldsDictionaryForMapping {
return @{};
}
+(NSArray*)relationships {
return @[];
}
@end
リレーションシップは、ネストされたオブジェクトを表すオブジェクトです。
RelationshipObject.h
@interface RelationshipObject : NSObject
@property (nonatomic,copy) NSString* source;
@property (nonatomic,copy) NSString* destination;
@property (nonatomic) Class mappingClass;
+(RelationshipObject*)relationshipWithKey:(NSString*)key andMappingClass:(Class)mappingClass;
+(RelationshipObject*)relationshipWithSource:(NSString*)source destination:(NSString*)destination andMappingClass:(Class)mappingClass;
@end
RelationshipObject.m
@implementation RelationshipObject
+(RelationshipObject*)relationshipWithKey:(NSString*)key andMappingClass:(Class)mappingClass {
RelationshipObject* object = [[RelationshipObject alloc] init];
object.source = key;
object.destination = key;
object.mappingClass = mappingClass;
return object;
}
+(RelationshipObject*)relationshipWithSource:(NSString*)source destination:(NSString*)destination andMappingClass:(Class)mappingClass {
RelationshipObject* object = [[RelationshipObject alloc] init];
object.source = source;
object.destination = destination;
object.mappingClass = mappingClass;
return object;
}
@end
次に、RestKitのマッピングを次のように設定します。
ObjectMappingInitializer.h
@interface ObjectMappingInitializer : NSObject
+(void)initializeRKObjectManagerMapping:(RKObjectManager*)objectManager;
@end
ObjectMappingInitializer.m
@interface ObjectMappingInitializer (Private)
+ (NSArray*)mappableClasses;
@end
@implementation ObjectMappingInitializer
+(void)initializeRKObjectManagerMapping:(RKObjectManager*)objectManager {
NSMutableDictionary *mappingObjects = [NSMutableDictionary dictionary];
// Creating mappings for classes
for (Class mappableClass in [self mappableClasses]) {
RKObjectMapping *newMapping = [RKObjectMapping mappingForClass:mappableClass];
[newMapping addAttributeMappingsFromArray:[mappableClass fieldsArrayForMapping]];
[newMapping addAttributeMappingsFromDictionary:[mappableClass fieldsDictionaryForMapping]];
[mappingObjects setObject:newMapping forKey:[mappableClass description]];
}
// Creating relations for mappings
for (Class mappableClass in [self mappableClasses]) {
RKObjectMapping *mapping = [mappingObjects objectForKey:[mappableClass description]];
for (RelationshipObject *relation in [mappableClass relationships]) {
[mapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:relation.source toKeyPath:relation.destination withMapping:[mappingObjects objectForKey:[relation.mappingClass description]]]];
}
}
// Creating response descriptors with mappings
for (Class mappableClass in [self mappableClasses]) {
for (NSString* pathPattern in [mappableClass pathPatterns]) {
if ([mappableClass keyPathes]) {
for (NSString* keyPath in [mappableClass keyPathes]) {
[objectManager addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:[mappingObjects objectForKey:[mappableClass description]] method:RKRequestMethodAny pathPattern:pathPattern keyPath:keyPath statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]];
}
} else {
[objectManager addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:[mappingObjects objectForKey:[mappableClass description]] method:RKRequestMethodAny pathPattern:pathPattern keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]];
}
}
}
// Error Mapping
RKObjectMapping *errorMapping = [RKObjectMapping mappingForClass:[Error class]];
[errorMapping addAttributeMappingsFromArray:[Error fieldsArrayForMapping]];
for (NSString *pathPattern in Error.pathPatterns) {
[[RKObjectManager sharedManager] addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:errorMapping method:RKRequestMethodAny pathPattern:pathPattern keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassClientError)]];
}
}
@end
@implementation ObjectMappingInitializer (Private)
+ (NSArray*)mappableClasses {
return @[
[FruiosPaginationResults class],
[FruioItem class],
[Pagination class],
[ContactInfo class],
[Credentials class],
[User class]
];
}
@end
MappableEntry実装の例：
User.h
@interface User : MappableEntity
@property (nonatomic) long userId;
@property (nonatomic, copy) NSString *username;
@property (nonatomic, copy) NSString *email;
@property (nonatomic, copy) NSString *password;
@property (nonatomic, copy) NSString *token;
- (instancetype)initWithUsername:(NSString*)username email:(NSString*)email password:(NSString*)password;
- (NSDictionary*)registrationData;
@end
User.m
@implementation User
- (instancetype)initWithUsername:(NSString*)username email:(NSString*)email password:(NSString*)password {
if (self = [super init]) {
self.username = username;
self.email = email;
self.password = password;
}
return self;
}
- (NSDictionary*)registrationData {
return @{
@"username": self.username,
@"email": self.email,
@"password": self.password
};
}
+ (NSArray*)pathPatterns {
return @[
[NSString stringWithFormat:@"/api/%@/users/register", APIVersionString],
[NSString stringWithFormat:@"/api/%@/users/login", APIVersionString]
];
}
+ (NSArray*)fieldsArrayForMapping {
return @[ @"username", @"email", @"password", @"token" ];
}
+ (NSDictionary*)fieldsDictionaryForMapping {
return @{ @"id": @"userId" };
}
@end
リクエストのラッピングについて：
すべてのAPIRequestクラスの行の長さを減らすために、ブロック定義を含むヘッダーファイルがあります。
APICallbacks.h
typedef void(^SuccessCallback)();
typedef void(^SuccessCallbackWithObjects)(NSArray *objects);
typedef void(^ErrorCallback)(NSError *error);
typedef void(^ProgressBlock)(float progress);
そして私が使用している私のAPIRequestクラスの例：
LoginAPI.h
@interface LoginAPI : NSObject
- (void)loginWithCredentials:(Credentials*)credentials onSuccess:(SuccessCallbackWithObjects)onSuccess onError:(ErrorCallback)onError;
@end
LoginAPI.m
@implementation LoginAPI
- (void)loginWithCredentials:(Credentials*)credentials onSuccess:(SuccessCallbackWithObjects)onSuccess onError:(ErrorCallback)onError {
[[RKObjectManager sharedManager] postObject:nil path:[NSString stringWithFormat:@"/api/%@/users/login", APIVersionString] parameters:[credentials credentialsData] success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
onSuccess(mappingResult.array);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
onError(error);
}];
}
@end
そして、コードで行う必要があるのは、APIオブジェクトを初期化し、必要なときに呼び出すだけです。
SomeViewController.m
@implementation SomeViewController {
LoginAPI *_loginAPI;
// ...
}
- (void)viewDidLoad {
[super viewDidLoad];
_loginAPI = [[LoginAPI alloc] init];
// ...
}
// ...
- (IBAction)signIn:(id)sender {
[_loginAPI loginWithCredentials:_credentials onSuccess:^(NSArray *objects) {
// Success Block
} onError:^(NSError *error) {
// Error Block
}];
}
// ...
@end
私のコードは完璧ではありませんが、一度設定して別のプロジェクトに使用するのは簡単です。それが誰にとっても興味深い場合は、時間をかけてGitHubとCocoaPodsのどこかでユニバーサルソリューションを作成できます。