已從另一個類繼承的Objective-C調用方法

Question

我無法讓左側類與視圖控制器ivars方法進行交互，我認爲它可能會執行多重繼承，但我沒有得到任何線索如何重構這個解決我的問題......

JACenterViewController - >繼承CustomClass.h //使用創建對象分配/初始化...

JALeft - >繼承JACenterViewController //我想說[的viewController myCustomClass] helloDelegate ]。

視圖控制器類：

#import "CustomClass.h" 
@interface JACenterViewController : UIViewController <CustomClassDelegate> 

@property (nonatomic, retain) CustomClass *myCustomClass; 

-(void)pushMe; 
@end 


#import "JACenterViewController.h" 
@implementation JACenterViewController 
@synthesize myCustomClass; 

// delegrate method 
-(void)sayHello:(CustomClass *)customClass { 
    [customClass helloDelegate]; 
} 

// class method 
- (void)viewDidLoad { 
    [super viewDidLoad]; 

    self.myCustomClass = [[CustomClass alloc] init]; 
    [self.myCustomClass setDelegate:self]; 
    [[self view] addSubview:[self.myCustomClass createButton]]; 
} 

-(void)pushMe { 
    NSLog(@"push me %@", [self class]); 
    [myCustomClass helloDelegate]; 
} 
@end 

我的自定義類，VC爲繼承：

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

@protocol CustomClassDelegate 
-(void)sayHello:(CustomClass *)customClass; 
@end 


@interface CustomClass : NSObject 

@property (nonatomic, assign) id delegate; 
@property UIButton *button; 

-(void)helloDelegate; 
-(UIButton*)createButton; 
@end 


#import "CustomClass.h" 
@implementation CustomClass 
@synthesize delegate, button; 


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

-(void)helloDelegate { 
    NSLog(@"Hello Delegate working!!: %@", [self class]); 
    [self.button setTitle:@"Title" forState:UIControlStateNormal]; 
} 

-(UIButton*)createButton { 
    self.button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
    [self.button setFrame:CGRectMake(0, 0, 100, 100)]; 
    return self.button; 
} 
@end 

而我最後我的左邊類（BTW：從故事板該類負載）：

#import "JACenterViewController.h" 
@interface JALeft : UIViewController 

@end 

#import "JALeft.h" 

@implementation JALeft 

- (void)viewDidLoad { 
    JACenterViewController *viewController = [[JACenterViewController alloc] init]; 

    NSLog(@"Respones %d", [[viewController myCustomClass] respondsToSelector:@selector(helloDelegate)]); 
    NSLog(@"Respones %d", [self respondsToSelector:@selector(helloDelegate)]); 
    NSLog(@"Respones %d", [super respondsToSelector:@selector(helloDelegate)]); 

    /* NOT WORKING: Method should call customClass methods that has been inherited from ViewController */ 
    [[viewController myCustomClass] helloDelegate]; 
} 

@end 

我想讓我的JALeft類從視圖控制器類中調用helloDelegate方法，因爲它是繼承？

Answer 1

Singleton： 一個總是返回自身相同實例的類。它爲班內所有資源提供全球接入點。

在CustomClass.h

：添加

+(CustomClass*)sharedObject; 

在CustomClass.m：添加

static CustomClass *sharedSingleton = nil; 

+(CustomClass*)sharedObject { 
     @synchronized(self) { 
     if (!sharedSingleton) { 
       sharedSingleton = [[CustomClass alloc] init]; 
      } return sharedSingleton; 
     } 
} 

+(id)alloc { 
     @synchronized(self) { 
      NSAssert(sharedSingleton == nil, @"Attempted to allocate a second instance of a singleton"); 
       sharedSingleton = [super alloc]; 
       return sharedSingleton; 
      } return nil; 

}

你想傳遞和接收消息包括在這個頭文件中的任何類類並使用工廠方法進行初始化。

Answer 2

理論上第一行應該工作，但是您沒有以調用viewDidLoad的方式實例化您的JACenterViewController - 因此您的CustomClass實例未加載。

爲確保調用viewDidLoad，使用nib實例化JACenterViewController。 可能就像 JACenterViewController *viewController = [[JACenterViewController alloc] initWithNibName:nil bundle:nil];

這樣你的viewDidLoad將被調用，然後你應該讓你的委託實例化。