在我的情况下，我通常使用ResKit库来设置网络层。它提供了易于使用的解析。它减少了我为不同的响应和内容设置映射的工作。
我只添加一些代码来自动设置映射。我为模型定义了基类（由于要检查是否实现了某种方法的代码很多，因此没有协议，而模型本身的代码更少）：
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
关系是表示响应中嵌套对象的对象：
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
然后我像这样设置RestKit的映射：
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实现的一些示例：
用户名
@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
用户名
@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
现在关于请求包装：
我有带有块定义的头文件，以减少所有APIRequest类中的行长：
APICallbacks.h
typedef void(^SuccessCallback)();
typedef void(^SuccessCallbackWithObjects)(NSArray *objects);
typedef void(^ErrorCallback)(NSError *error);
typedef void(^ProgressBlock)(float progress);
我正在使用的APIRequest类的示例：
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
只需编写API对象并在需要时调用它，您就可以在代码中进行所有操作：
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
我的代码并不完美，但是很容易设置一次并用于不同的项目。如果对任何人都有趣，我可以花一些时间在GitHub和CocoaPods上的某个地方为它制定一个通用解决方案。