objective-c - 无法分配 self.delegate 它会产生无法识别的选择器发送

Question

我是 iOS 的新手，我在实现 @protocol 时遇到了麻烦，如果您认为这是一件容易的事，我深表歉意。

我一直在 stackoverflow.com、网络上搜索，也尝试过谷歌叔叔一段时间，我决定在这里问...

主要思想是从 TopViewController 调用 MyViewController 并做翻转动画我从创建协议(protocol)开始......

    // This is my Delegate header
    // MyViewController.h

    @protocol MyViewControllerlDelegate

    - (void) myViewControllerDidFinish;

    @end

    @interface MyViewController : UIViewController 
    {
     id <MyViewControllerlDelegate> delegate;
    }

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

    - (IBAction) done;

    @end

下面是实现:

    // MyViewController.m

    #import "MyViewController.h"

    @implementation MyViewController

    @synthesize delegate;

    // Another Code above

    - (IBAction)done 
    {
     [self.delegate myViewControllerDidFinish];
    }

    // Another Code Below

    @end

我使用上面的对象从下面的另一个 View 调用并在其中添加翻转过渡:

// TopViewController.h

#import "MyViewController.h"

@class MapScrollView;

@interface TopViewController : UIViewController <UIScrollViewDelegate,MyViewControllerlDelegate> 
{
    UIScrollView *topScrollView;
    UIButton *infoButton;
}

@end

TopViewController.h 实现 //TopViewController.m

#import "TopViewController.h"
#import "CustomScrollView.h"
#import <QuartzCore/QuartzCore.h>

- (void)loadView 
{    
    // Step 1: make the outer paging scroll view
    CGRect topScrollViewRect = [[UIScreen mainScreen] bounds];
    topScrollView = [[UIScrollView alloc] initWithFrame:topScrollViewRect];
    topScrollView.pagingEnabled = YES;
    topScrollView.backgroundColor = [UIColor blackColor];
    topScrollView.showsVerticalScrollIndicator = NO;
    topScrollView.showsHorizontalScrollIndicator = NO;
    topScrollView.contentSize = CGSizeMake(topScrollViewRecte.size.width,
                                              topScrollViewRecte.size.height);
    topScrollView.delegate = self;
    self.view = pagingScrollView;

    CustomScrollView *sView = [[[MapScrollView alloc] init] autorelease];

    sView.frame = [[UIScreen mainScreen] bounds];

    [sView displayTiledMap];

    [pagingScrollView addSubview:sView];

    // add Info Button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeInfoDark];
    [button addTarget:self action:@selector(infoIsTouch:)   forControlEvents:UIControlEventTouchDown];
    button.frame = CGRectMake(282.0, 440.0, 18.0, 19.0);
    [self.view addSubview:button];
}

-(void)infoIsTouch:(id)sender
{
 MyViewController *myView = 
 [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:[NSBundle mainBundle]];
 myView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
        //
        //Here where the code is crash 
        //
 [myView setDelegate:self];
        //
        //Code from here to below is not run...
        //
 [self presentModalViewController:myView animated:YES];
 [myView release];
}

- (void) myViewControllerDidFinish
{
 [self dismissModalViewControllerAnimated:YES];
}

etc... 

@end

下面的代码会产生以下编译器错误..

2010-12-06 01:09:07.946 MyViewDelegatePractice[9473:207] -[TopViewController setDelegate:]: unrecognized selector sent to instance 0x5f30fb0
2010-12-06 01:09:07.949 MyViewDelegatePractice[9473:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[TopViewController setDelegate:]: unrecognized selector sent to instance 0x5f30fb0'
*** Call stack at first throw:
(
    // Cuts... 
)
terminate called after throwing an instance of 'NSException'

当我按下调用 -(void)infoIsTouch:(id)sender 方法的 infoButton 时出现这些错误，然后在 [myView setDelegate:self] 行停止。任何人都可以提示我我的错误在哪里吗？

注意:如果你对我的英语感到厌恶..也可以随意发表评论..但在那之前..对不起，我已经尽力了..

Answer 1

旧帖子，但对于遇到相同问题的其他人，请确保将身份检查器中的类别设置为正确的类别。那是我的问题。可能是 Xcode 中最容易忘记的事情。