Question

我在这里做错了，但我无法弄清楚它是什么。

AppDelegate.h

#import <UIKit/UIKit.h>


@interface AppDelegate : NSObject <UIApplicationDelegate, UIScrollViewDelegate> {
    UIWindow *window;
    UIScrollView *scrollView;
    UIPageControl *pageControl;
    NSMutableArray *viewControllers;
    UIView *flipside;

    // To be used when scrolls originate from the UIPageControl
    BOOL pageControlUsed;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UIScrollView *scrollView;
@property (nonatomic, retain) IBOutlet UIPageControl *pageControl;
@property (nonatomic, retain) IBOutlet UIView *flipside;
@property (nonatomic, retain) NSMutableArray *viewControllers;

- (IBAction)showInfo:(id)sender;
- (IBAction)changePage:(id)sender;

@end

AppDelegate.m

- (IBAction)showInfo:(id)sender {    

    FlipsideViewController *controller = [[FlipsideViewController alloc] initWithNibName:@"FlipsideView" bundle:nil];
    controller.delegate = self;

    controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller animated:YES];

    [controller release];
}

这是我得到的地方： 警告：类'AppDelegate'未实现'FlipsideViewControllerDelegate'协议。

后行： controller.delegate = self;

我的FlipsideViewController.h如下所示：

#import <UIKit/UIKit.h>

@protocol FlipsideViewControllerDelegate;


@interface FlipsideViewController : UIViewController {
    id <FlipsideViewControllerDelegate> delegate;
}

@property (nonatomic, assign) id <FlipsideViewControllerDelegate> delegate;
- (IBAction)done:(id)sender;
@end


@protocol FlipsideViewControllerDelegate
- (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller;
@en

非常感谢任何帮助：）

Answer 1

这正是错误消息所说的内容。 AppDelegate只是没有实现协议。在您的标头文件中，在方括号（即FlipsideViewControllerDelegate）之间添加<UIApplicationDelegate, UIScrollViewDelegate, FlipsideViewControllerDelegate>，并实施-flipsideViewControllerDidFinish:方法。

Answer 2

尝试将FlipsideViewControllerDelegate添加到appDelegate

@interface AppDelegate : NSObject <UIApplicationDelegate, UIScrollViewDelegate,FlipsideViewControllerDelegate> {
    UIWindow *window;
    UIScrollView *scrollView;
    UIPageControl *pageControl;
    NSMutableArray *viewControllers;
    UIView *flipside;

    // To be used when scrolls originate from the UIPageControl
    BOOL pageControlUsed;
}

Class Delegate不实现协议

2 个答案: