Xcode ARC與overlayviewcontroller衝突

Question

PhotoPicker sample code uses an overlay view。以下是我在我的應用程序中使用的PhotoPicker的一些相關代碼，但我想使用ARC，並且PhotoPicker不使用ARC。我想我已經設法解決PhotoPicker和ARC之間的其他衝突，但不是這一個。

當我在OverlayViewController.h中使用id <OverlayViewControllerDelegate> delegate;下面的行時，我得到錯誤Existing ivar 'delegate' for property 'delegate' with assign attribute must be __unsafe_unretained。

OverlayViewController.h

#import <UIKit/UIKit.h> 
#import <AudioToolbox/AudioServices.h> 

@protocol OverlayViewControllerDelegate; 

@interface OverlayViewController : UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate> 
{ 
    id <OverlayViewControllerDelegate> delegate; // **THIS IS THE KEY LINE** 
}  

@property (nonatomic, assign) id <OverlayViewControllerDelegate> delegate; 
@property (nonatomic, retain) UIImagePickerController *imagePickerController; 

- (void)setupImagePicker:(UIImagePickerControllerSourceType)sourceType; 

@end 

@protocol OverlayViewControllerDelegate 
- (void)didTakePicture:(UIImage *)picture; 
- (void)didFinishWithCamera; 
@end 

But when I follow the advise here，並且或者註釋掉該行或前置一個符合__unsafe_unretained，我得到的問題MyViewController.hCannot find protocol declaration for 'OverlayViewControllerDelegate'; did you mean 'UISplitViewControllerDelegate'?。

MyViewController.h

#import <UIKit/UIKit.h> 

#import "OverlayViewController.h" 

@interface MyViewController : UIViewController <UIImagePickerControllerDelegate, OverlayViewControllerDelegate> 
@end 

Answer 1

有我的問題的錯誤。很抱歉。 在實際代碼中，#import "OverlayViewController.h已被省略。

MyViewController.h 

#import <UIKit/UIKit.h> 

#import "OverlayViewController.h"