1

调试器显示此信息：

2013-07-16 15:23:15.731 app2[2501:c07] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x71a4140> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageview.'

我的应用目前由两个视图控制器组成。

  1. “ViewController”只有一个按钮来启动应用程序并按下按钮启动新视图。
ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
- (IBAction)startBtn:(id)sender;

@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)startBtn:(id)sender {

    UIViewController *flipViewController = [[UIViewController alloc] initWithNibName:@"AppViewController" bundle:[NSBundle mainBundle]];

    [self presentViewController:flipViewController animated:YES completion:NULL];

}

@end

我的第二个视图控制器“AppViewController”有一个 UIImageView 和一个 UIButton。它的代码是：

AppViewController.h

#import <UIKit/UIKit.h>

@interface AppViewController : UIViewController
@property (strong, nonatomic) IBOutlet UIImageView *imageview;

@end

和

AppViewController.m

#import "AppViewController.h"

@interface AppViewController ()

@end

@implementation AppViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end

我面临的问题是，当我通过 Ctrl 将图像视图拖动到“h”文件中连接“xib”文件和“h”文件之间的属性时，我的应用程序在模拟器中崩溃并给了我错误。

我认为这对你们中的许多人来说可能是一个太简单的错误，但是，我无法纠正它。我已经阅读了这个论坛上的许多帖子并且尝试过最多，包括@synthesize 修复等。

4

1 回答 1

2

你flipViewController应该是一个AppViewController.

问题在于它AppViewController是 的子类，UIViewController因此您可以将其实例化为UIViewController，但您无法访问在'AppViewController之上添加的所有其他属性UIViewController。

您的按钮处理程序应如下所示：

- (IBAction)startBtn:(id)sender {

    AppViewController *flipViewController = [[AppViewController alloc] initWithNibName:@"AppViewController" bundle:[NSBundle mainBundle]];

    [self presentViewController:flipViewController animated:YES completion:NULL];

}
于 2013-07-16T20:07:22.000 回答