委派和模态视图控制器

Question

根据视图控制器编程指南，委派是解除模态视图的首选方法。

继苹果自己的食谱举例来说，我已实行以下，但不断收到警告，该addNameController:didAddName方法没有找到......

NameDelegate.h 
    @protocol NameDelegate 
    - (void)addNameController:(AddName *)addNameController didAddName:(NSString *)name; 
    @end 

AddName.h 
    @interface AddName : UIViewController { 
     UITextField *nameField; 
     id delegate; 
    } 
    - (IBAction)doneAction; 
    - (id)delegate; 
    - (void)setDelegate:(id)newDelegate; 
    @property (nonatomic, retain) IBOutlet UITextField *nameField; 
    @end 

AddName.m 
    - (IBAction)doneAction { 
     [delegate addNameController:self didAddName:[nameField text]]; 
    } 

    - (id)delegate { 
     return delegate; 
    } 

    - (void)setDelegate:(id)newDelegate { 
     delegate = newDelegate; 
    } 

ItemViewController.h 
    #import "NameDelegate.h" 
    @interface ItemViewController : UITableViewController <NameDelegate>{ 
    } 
    @end 

ItemViewController.m 
    - (void)addItem:(id)sender { 

     AddName *addName = [[AddName alloc] init]; 
     addName.delegate = self; 
     [self presentModalViewController:addName animated:YES]; 
    } 

    - (void)addNameController:(AddName *)addNameController didAddName:(NSString *)name { 
     //Do other checks before dismiss... 
     [self dismissModalViewControllerAnimated:YES]; 
    } 

我认为所有需要的元素有没有在正确的地方？

感谢

Answer 1

您还没有指定的AddName的delegate酒店以符合NameDelegate协议。

使用此代码AddName.h：

#import "NameDelegate.h" 

@interface AddName : UIViewController { 
    UITextField *nameField; 
    id <NameDelegate> delegate; 
} 

@property(nonatomic, retain) IBOutlet UITextField *nameField; 
@property(nonatomic, assign) id <NameDelegate> delegate; 

- (IBAction)doneAction; 

@end