協議和多視圖控制器

Question

我有一個項目，在其中的SwitchViewController是根控制器 它加載viewcontroller2在某些狀態， viewcontroller2在某些狀態下加載modalviewcontroller1。 有一個功能modelviewcontroller1「okButtonPressed」（斷點1）， 我希望它可以通知viewcontroller2並調用該函數「DoSomething的」（//斷點2）

所以，我設置了協議，所有視圖控制器（switchviewcontroller ，viewcontroller2，modalviewcontroller1） 包含協議

我設置了breakpoint1和breakpoint2如下。

沒有報告任何錯誤，但在斷點2沒有停止，'dosomething'沒有執行。

歡迎任何評論

感謝 InterDev中

//----------------------------------------------source codes 

//myprotocol.h 
#import <Foundation/Foundation.h> 
#import <UIKit/UIKit.h> 


@class Myprotocol; 

@protocol MyprotocolDelegate <NSObject> 
@optional 

- (void)function1 ; 

@end 
//----------------------------------- 

@interface Myprotocol : NSObject { 

    id <MyprotocolDelegate> delegate; 
} 

@property (nonatomic, assign) id <MyprotocolDelegate> delegate; 

@end 
//myprotocol.m 


#import "myprotocol.h" 
@implementation Myprotocol 
@synthesize delegate; 

- (void)dealloc {  
    [super dealloc]; 
} 
@end 

//"ModalViewController1.h" 
#import <UIKit/UIKit.h> 

#import "myprotocol.h" 

@interface ModalViewController1 : UIViewController <MyprotocolDelegate> { 
id<MyprotocolDelegate> delegate; 
} 
@property (nonatomic, assign) id<MyprotocolDelegate> delegate; 

- (IBAction)okButtonPressed:(id)sender; 
@end 

//"ModalViewController1.m" 


#import "ModalViewController1.h" 

@implementation ModalViewController1 
@synthesize delegate; 

- (IBAction)okButtonPressed:(id)sender; 
{  
    [delegate function1];//breakpoint 1 
    [self.view removeFromSuperview];  
} 

//------ViewController2.h" 
#import <UIKit/UIKit.h> 

#import "myprotocol.h" 


@class ModalViewController1 ; 
@interface ViewController2 : UIViewController <MyprotocolDelegate>{ 
    ModalViewController1 *vModalViewController1; 
    id<MyprotocolDelegate> delegate; 

} 
@property (nonatomic, assign) id<MyprotocolDelegate> delegate; 
@property (retain,nonatomic) ModalViewController1 *vModalViewController1; 
@end 

//----ViewController2.m"-------------- 
#import "ViewController2.h" 
#import "ModalViewController1.h" 

@synthesize delegate; 

- (void)function1; 
{ 
    [self dosomething];//breakpoint 2 
} 

//SwitchViewController.h 

#import <UIKit/UIKit.h> 

#import "myprotocol.h" 


@class ViewController2; 

@class ModalViewController1 ; 


@interface SwitchViewController : UIViewController <MyprotocolDelegate> { 

    ViewController2 *vViewController2; 

}  

@property (retain,nonatomic) ViewController2 *vViewController2; 

@end 

//in SwitchViewController.m 

ViewController2 *vvViewController2=[[ViewController2 alloc] 
     initWithNibName:@"View2" bundle:nil]; 
self.vViewController2=vvViewController2; 

[vvViewController2 release]; 
[self.vViewController2 setDelegate:self]; 

Answer 1

對於這個工作你需要設置你的ViewController2的實例作爲委託ModalViewController1