将自定义对象导入多个文件

时间：2018-02-07 20:19:34

标签： ios objective-c jsonmodel

将自定义对象导入到viewController中时遇到了一些问题。

我创建了一个Message Object，它保存来自服务器的json响应。 然后我创建了一个MessageManager类，它执行对API的所有网络调用。

MessageManager导入Message，以创建消息对象并将其传递给正在使用它的任何类。

我现在有了我的viewController类，其中#import是MessageManager和Message。所以我可以创建一个Message的实例变量。 但是我在编译器中遇到了重复的符号错误。

如何解决此问题，并拥有正确的导入序列。

如果我从viewcontroller中删除Message.h，并删除任何引用Message的代码，它会正常编译。

Messages.h由JSONModel返回并解析json对象

#import <JSONModel/JSONModel.h>

@protocol Messages;
@interface Messages : JSONModel
@property (nonatomic) NSString<Optional>* id;
@property (nonatomic) NSString<Optional>* sender_id;
@property (nonatomic) NSString<Optional>* receiver_id;
@property (nonatomic) NSString<Optional>* user_user_id;
@property (nonatomic) NSString<Optional>* job_id;
@property (nonatomic) NSString<Optional>* file_id;
@property (nonatomic) NSString<Optional>* title;
@property (nonatomic) NSString<Optional>* replied;
@end






@protocol MessagesModel;
@interface MessagesModel : JSONModel
@property (nonatomic) NSString<Optional>* action;
@property (nonatomic) NSDate<Optional>* dateTime;
@property (nonatomic) NSString<Optional>* result;
@property (nonatomic) NSString<Optional>* numItems;
@property (nonatomic) NSArray <Messages>  *items;
@end

@implementation MessagesModel
+ (JSONKeyMapper *)keyMapper
{
    return [JSONKeyMapper mapperForSnakeCase];
}
@end

MessageViewController.h 

#import <UIKit/UIKit.h>

@interface MessagesViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>

@property (strong, nonatomic) UISearchController *searchController;


@end

MessageViewController.m 

#import "MessagesViewController.h"
#import "MessageTableViewCell.h"
#import "MessageThreadViewController.h"
#import "Messages.h" <--Need Messages Object to use Object and pass object around
#import "MessageManager.h"

@interface MessagesViewController () <UISearchBarDelegate, UISearchResultsUpdating, UIActionSheetDelegate, UISearchControllerDelegate>

@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (strong, nonatomic) NSArray *inbox;
@property (strong, nonatomic) NSArray *sent;
@property (strong, nonatomic) NSArray *deleted;
@property (strong, nonatomic) NSArray *temp;
@property (assign, nonatomic) NSInteger selectedBox;
@property (assign, nonatomic) NSInteger selectedMessage;
@property (strong, nonatomic) MessageManager *messageManager;
@property (weak, nonatomic) IBOutlet UISearchBar *searchbar;
@property (strong, nonatomic) Messages *messages;

@end

MessageManager.h 

#import <Foundation/Foundation.h>
@interface MessageManager : NSObject


- (void)getReceivedMessagesListForReceiverID:(NSString*)receiverID success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)getSentMessagesListForSenderID:(NSString*)senderID success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)getDeletedMessagesListForMemberID:(NSString*)memberID success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)searchReceivedMessagesListForReceiverID:(NSString*)receuverID andKeyword:(NSString*)keyword success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)searchDeletedMessagesListForMemberID:(NSString*)memberID andKeyword:(NSString*)keyword success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)unreadMessagesCountForReceiverID:(NSString*)receiverID success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)sendMessageToReceiverID:(NSString*)receieverID ToSenderID:(NSString*)senderID withTitle:(NSString*)title andMessage:(NSString*)message success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)markMessageRead:(NSString*)messageID success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)markMessageUnRead:(NSString*)messageID success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)receivedListCountForReceivedID:(NSString*)receivedID success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)deletedMessagesListCountForMemberID:(NSString*)memberID success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)searchReceivedListCountForReceiverID:(NSString*)receiverID andKeyword:(NSString*)keyword success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)searchSentListCountForSender:(NSString*)senderID andKeyword:(NSString*)keyword success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
- (void)searchDeletedListCountForMemberID:(NSString*)memberID andKeyword:(NSString*)keyword success:(void (^)(NSArray *success))success failure:(void (^)(NSError *error))failure;
@end

MessageManager.m 

#import "MessageManager.h"
#import "Constants.h"
#import <AFNetworking/AFNetworking.h>
#import "Messages.h" <--Need Messages Object to create Messages from response

@implementation MessageManager
...

错误

duplicate symbol _OBJC_IVAR_$_MessagesModel._result in:
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessagesViewController.o
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessageManager.o
duplicate symbol _OBJC_IVAR_$_MessagesModel._items in:
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessagesViewController.o
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessageManager.o
duplicate symbol _OBJC_IVAR_$_MessagesModel._numItems in:
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessagesViewController.o
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessageManager.o
duplicate symbol _OBJC_CLASS_$_Messages in:
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessagesViewController.o
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessageManager.o
duplicate symbol _OBJC_METACLASS_$_Messages in:
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessagesViewController.o
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessageManager.o
duplicate symbol _OBJC_IVAR_$_Messages._deleted_by_sender in:
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessagesViewController.o
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessageManager.o
duplicate symbol _OBJC_IVAR_$_MessagesModel._action in:
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessagesViewController.o
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessageManager.o
duplicate symbol _OBJC_IVAR_$_Messages._receiver_login in:
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessagesViewController.o
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessageManager.o
duplicate symbol _OBJC_IVAR_$_Messages._sender_login in:
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessagesViewController.o
    /Users/anthonytaylor/Library/Developer/Xcode/DerivedData/Build/Intermediates/Voices.com.build/Debug-iphonesimulator/Voices.com.build/Objects-normal/x86_64/MessageManager.o
...

1 个答案:

答案 0 :(得分：2)

根据您在问题中提到的文件，您的项目中只有Application.Resources文件而没有Messages.h文件，而是在标题中声明了实现档案，我是对的？通过复制问题中的类，我能够在示例项目found here上复制重复符号错误。但是当我创建一个带有Messages.m和Messages类实现的Messages.m文件时，重复符号编译器错误消失了，我能够创建MessageManager类的实例

话虽如此，我不确定你的意思

  

JSONModel教程都显示在标题中执行@implementation，根本不需要.m文件。

评论，但根据JSONModel＆＃39; Github readme page，他们说：

  

无需在实现（.m）文件中执行任何操作。

这可能并不意味着您不需要拥有.m文件。无论如何，为一个类同时拥有.h和.m文件是一个很好的做法，因为Xcode项目的MessageManager选项卡下的Compile Sources选项只有.m文件文件。这是告诉编译器在构建目标时应编译哪些源文件的原因。由于您在.h文件中声明了实现，因此编译器无法在构建时找到它。

这是我设置的示例Xcode项目的屏幕截图：

Screenshot of the Xcode project setup

MessageManager.h文件

Build Phases

MessageManager.m文件：

#import <Foundation/Foundation.h>
@class MessagesModel;

@interface MessageManager : NSObject

+ (MessagesModel *)getMessages;

@end

Messages.h文件：

#import "MessageManager.h"
#import "Messages.h" //<-- Imported here

@implementation MessageManager

+ (MessagesModel *)getMessages {
    NSError *error = nil;
    NSDictionary *dictionary = @{@"action": @"replied",
                                 @"dateTime": @"",
                                 @"result": @"success",
                                 @"numItems": @"1",
                                 @"items": @[@{@"id": @"1",
                                               @"sender_id": @"2",
                                               @"receiver_id": @"3",
                                               @"user_user_id": @"4",
                                               @"job_id": @"5",
                                               @"file_id": @"6",
                                               @"title": @"Hello world",
                                               @"replied" : @"7"}]};
    MessagesModel *messages = [[MessagesModel alloc] initWithDictionary:dictionary error:&error];
    if (error)
        NSLog(@"Oops!");

    return messages;
}

@end

Messages.m文件：

#import <JSONModel/JSONModel.h>

@protocol Messages;
@interface Messages : JSONModel
@property (nonatomic) NSString<Optional>* id;
@property (nonatomic) NSString<Optional>* sender_id;
@property (nonatomic) NSString<Optional>* receiver_id;
@property (nonatomic) NSString<Optional>* user_user_id;
@property (nonatomic) NSString<Optional>* job_id;
@property (nonatomic) NSString<Optional>* file_id;
@property (nonatomic) NSString<Optional>* title;
@property (nonatomic) NSString<Optional>* replied;
@end


@protocol MessagesModel;
@interface MessagesModel : JSONModel
@property (nonatomic) NSString<Optional>* action;
@property (nonatomic) NSDate<Optional>* dateTime;
@property (nonatomic) NSString<Optional>* result;
@property (nonatomic) NSString<Optional>* numItems;
@property (nonatomic, strong) NSArray <Messages>  *items;
@end

ViewController.m文件：

#import "Messages.h"

@implementation Messages

@end

@implementation MessagesModel

+ (JSONKeyMapper *)keyMapper {
    return [JSONKeyMapper mapperForSnakeCase];
}

@end

最后，输出： LLDB Output

如果您想要我检查设置，请告诉我您是否要上传Xcode项目。

希望这有帮助。

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