Ios 目标c遗传和设定者

目标C问题：

我有一个ViewController的超类和一个data controller的超类。数据控制器有权在更新后通知ViewController。这一切似乎都是可行的，但在输入一些日志之后，委托方法似乎每次都会被调用两次。我想每个子数据控制器实际上可能有两个实例。我一定是在某处举例说明什么地方出错了。有人能看出我做错了什么吗

我有一个数据密集型应用程序的单独屏幕。我已将其设置为UIViewController的一个超类，所有这些超类都继承自：

DmsProgressBaseViewController.h

@class DmsProgressDataController;

@interface DmsProgressBaseViewController : UIViewController

@property(readonly,assign,nonatomic)DmsProgressDataController *dataController;
//index, so we be identified in container
@property(assign,nonatomic)NSInteger index;

@end

@class AFHTTPRequestOperation;
@class DmsProgressDataController;

@protocol DmsProgressDataControllerDelegate

-(void)dataLoadedSuccessfully;

@end


@interface DmsProgressDataController : NSObject

@property(nonatomic,assign)id delegate;
@property(nonatomic, strong)NSString *resourceUrl;
-(void)loadDataFromRest;
-(void)loadDataFromRest:(NSString*)resourceUrl;
-(void)handleRestSuccess:(id)jsonResponse;
-(void)handleRestError:(NSError*)error forOperation:(AFHTTPRequestOperation*)operation;

//delegate method
-(void)notifyDataLoadedSuccessfully;

@end

@interface DmsProgressOverallDataController : DmsProgressDataController

@end

DmsProgressBaseViewController.m

@implementation DmsProgressBaseViewController

@synthesize dataController=_dataController;


- (void)viewDidLoad
{
    [super viewDidLoad];
}

-(DmsProgressDataController*)dataController
{
    if(!_dataController){
        _dataController=[[DmsProgressDataController alloc]init];
    }
    return _dataController;
}

.....

@end

@interface DmsProgressOverallViewController ()<DmsProgressDataControllerDelegate>

@end

@implementation DmsProgressOverallViewController
@synthesize dataController=_dataController;
- (void)viewDidLoad
{
    [super viewDidLoad];
[self.dataController loadDataFromRest:@"overall"];
    self.dataController.delegate=self;
}

-(DmsProgressDataController*)dataController
{
    if(!_dataController){
        _dataController=[[DmsProgressOverallDataController alloc]init];
    }
    return _dataController;
}
#pragma mark - datacontroller delegate method
-(void)dataLoadedSuccessfully
{
    NSLog(@"Overall data loaded successfully");
}

@end

@implementation DmsProgressOverallDataController


-(id)init
{
    if(self=[super init]){
        self.resourceUrl=@"progress/totals";
    }

    return self;
}

-(void)handleRestSuccess:(id)jsonResponse
{
    NSString *defaultClg=[jsonResponse objectForKey:@"defaultClg"];
    NSArray *clgs=[jsonResponse objectForKey:@"colleges"];
    for(NSString *clg in clgs){
        College *college =[College MR_createEntity];
        college.collegeName=clg;
        if([defaultClg isEqualToString:clg]){
            college.defaultClg=[NSNumber numberWithBool:YES];
        }
    }

    //DataController delegate method called here
    if(self.delegate!=nil){
        [self.delegate dataLoadedSuccessfully];
    }

}

@end

正如您所见，每个视图都有一个datacontroller，它通过rest服务加载数据并将其导入核心数据。它还继承自： dmsprrogressdatacontroller.h

@class DmsProgressDataController;

@interface DmsProgressBaseViewController : UIViewController

@property(readonly,assign,nonatomic)DmsProgressDataController *dataController;
//index, so we be identified in container
@property(assign,nonatomic)NSInteger index;

@end

@class AFHTTPRequestOperation;
@class DmsProgressDataController;

@protocol DmsProgressDataControllerDelegate

-(void)dataLoadedSuccessfully;

@end


@interface DmsProgressDataController : NSObject

@property(nonatomic,assign)id delegate;
@property(nonatomic, strong)NSString *resourceUrl;
-(void)loadDataFromRest;
-(void)loadDataFromRest:(NSString*)resourceUrl;
-(void)handleRestSuccess:(id)jsonResponse;
-(void)handleRestError:(NSError*)error forOperation:(AFHTTPRequestOperation*)operation;

//delegate method
-(void)notifyDataLoadedSuccessfully;

@end

@interface DmsProgressOverallDataController : DmsProgressDataController

@end

DmsProgressDataController.m @数据控制器的实现

- (id)init
{
    self = [super init];
    if (self) {

    }
    return self;
}

-(void)loadDataFromRest
{
    NSLog(@"loading %@",self.resourceUrl);
    if(self.resourceUrl!=nil){
        [self loadDataFromRest:self.resourceUrl];
    }
}
....

#pragma mark - delegate methods
-(void)notifyDataLoadedSuccessfully
{
    if(self.delegate!=nil){
        [self.delegate dataLoadedSuccessfully];
    }
}
@end

因此，这些是超级类

子类的一个示例是： DmsProgressOverallViewController.h @类DMS ProgressOverallDataController

@interface DmsProgressOverallViewController : DmsProgressBaseViewController

@property(readonly,strong,nonatomic)DmsProgressOverallDataController *dataController;

@end

DmsProgressOverallViewController.m

@implementation DmsProgressBaseViewController

@synthesize dataController=_dataController;


- (void)viewDidLoad
{
    [super viewDidLoad];
}

-(DmsProgressDataController*)dataController
{
    if(!_dataController){
        _dataController=[[DmsProgressDataController alloc]init];
    }
    return _dataController;
}

.....

@end

@interface DmsProgressOverallViewController ()<DmsProgressDataControllerDelegate>

@end

@implementation DmsProgressOverallViewController
@synthesize dataController=_dataController;
- (void)viewDidLoad
{
    [super viewDidLoad];
[self.dataController loadDataFromRest:@"overall"];
    self.dataController.delegate=self;
}

-(DmsProgressDataController*)dataController
{
    if(!_dataController){
        _dataController=[[DmsProgressOverallDataController alloc]init];
    }
    return _dataController;
}
#pragma mark - datacontroller delegate method
-(void)dataLoadedSuccessfully
{
    NSLog(@"Overall data loaded successfully");
}

@end

@implementation DmsProgressOverallDataController


-(id)init
{
    if(self=[super init]){
        self.resourceUrl=@"progress/totals";
    }

    return self;
}

-(void)handleRestSuccess:(id)jsonResponse
{
    NSString *defaultClg=[jsonResponse objectForKey:@"defaultClg"];
    NSArray *clgs=[jsonResponse objectForKey:@"colleges"];
    for(NSString *clg in clgs){
        College *college =[College MR_createEntity];
        college.collegeName=clg;
        if([defaultClg isEqualToString:clg]){
            college.defaultClg=[NSNumber numberWithBool:YES];
        }
    }

    //DataController delegate method called here
    if(self.delegate!=nil){
        [self.delegate dataLoadedSuccessfully];
    }

}

@end

DmsProgressOverallDataController.m

@implementation DmsProgressBaseViewController

@synthesize dataController=_dataController;


- (void)viewDidLoad
{
    [super viewDidLoad];
}

-(DmsProgressDataController*)dataController
{
    if(!_dataController){
        _dataController=[[DmsProgressDataController alloc]init];
    }
    return _dataController;
}

.....

@end

@interface DmsProgressOverallViewController ()<DmsProgressDataControllerDelegate>

@end

@implementation DmsProgressOverallViewController
@synthesize dataController=_dataController;
- (void)viewDidLoad
{
    [super viewDidLoad];
[self.dataController loadDataFromRest:@"overall"];
    self.dataController.delegate=self;
}

-(DmsProgressDataController*)dataController
{
    if(!_dataController){
        _dataController=[[DmsProgressOverallDataController alloc]init];
    }
    return _dataController;
}
#pragma mark - datacontroller delegate method
-(void)dataLoadedSuccessfully
{
    NSLog(@"Overall data loaded successfully");
}

@end

@implementation DmsProgressOverallDataController


-(id)init
{
    if(self=[super init]){
        self.resourceUrl=@"progress/totals";
    }

    return self;
}

-(void)handleRestSuccess:(id)jsonResponse
{
    NSString *defaultClg=[jsonResponse objectForKey:@"defaultClg"];
    NSArray *clgs=[jsonResponse objectForKey:@"colleges"];
    for(NSString *clg in clgs){
        College *college =[College MR_createEntity];
        college.collegeName=clg;
        if([defaultClg isEqualToString:clg]){
            college.defaultClg=[NSNumber numberWithBool:YES];
        }
    }

    //DataController delegate method called here
    if(self.delegate!=nil){
        [self.delegate dataLoadedSuccessfully];
    }

}

@end

我希望这能提供足够的信息。

---

再次感谢您的帮助

在SubViewController中有一个实例变量名和属性名，它们也存在于超类SuperViewController中。可以在超类和类中合成属性名。我怀疑正在发生的是，SubViewClass中的_dataController是从SuperViewController继承的_dataController。您没有提供足够的代码来查看dataController是如何使用的，但是如果您有不同的ivar和属性名称（a），那么读取起来就不会那么混乱，（b）它可能会解决双重调用问题。试试看

我想指出你把术语弄得很复杂

@interface SuperViewController:UIViewController

表示

SuperViewController

是

UIViewController

的子类

UIViewController

是

UIResponder

的子类。而

UIResponder

是

NSObject

的一个子类，它是基类。编辑：我现在看到您的

SuperViewController

名称与

SubViewController

类有关。您需要告诉我们有关该代理的更多信息。我们没有这方面的消息。这不是继承或合成问题。正如其他人之前所说，您的代码很难阅读，因为例如，您的SuperViewController实际上是UIViewController的子类。您使用的是我们不知道的SuperDataController。好的，很抱歉代码含糊不清。我还是个笨蛋。我编辑并添加了更详细的代码。实际上，我认为这是一个综合/继承问题，我只是不确定在objective c中如何正确地进行继承。