NSException与UIImagePickerController

Question

我正在Xcode 5中构建我的第一个IOS 7 iPad应用程序 - 但我需要一些帮助解决此问题。

我下面this教程：

我不太明白什么是作家意味着： “所以打通testPickerViewController.h，我们希望在下面的类添加引用。”

UINavigationControllerDelegate, UIImagePickerControllerDelegate> 

我来到这里我的观点或者Controller.h文件：

#import "ViewController.h" 

@interface DetailViewController : ViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate> 
{ 
UIImagePickerController *imgPicker; 
IBOutlet UIImageView *customImage; 
} 

@property(nonatomic, retain)UIImagePickerController *imgPicker; 

@end 

我看来Controller.m或者文件：

#import "DetailViewController.h" 

@interface DetailViewController() 

@end 

@implementation DetailViewController 
@synthesize imgPicker, customImage; 

- (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. 

// Init the image picker 
self.imgPicker = [[UIImagePickerController alloc]init]; 
self.imgPicker.allowsEditing = YES; 
self.imgPicker.delegate = self; 
self.imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
} 

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

/* 
#pragma mark - Navigation 

// In a storyboard-based application, you will often want to do a little preparation before navigation 
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{ 
// Get the new view controller using [segue destinationViewController]. 
// Pass the selected object to the new view controller. 
} 
*/ 
- (IBAction)AddImage:(id)sender { 
// Let the user add an image for the specific subject 
[self presentModalViewController:self.imgPicker animated:YES]; 
} 

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)img editingInfo:(NSDictionary *)editingInfo { 
customImage.image = img; 
[[picker parentViewController] dismissModalViewControllerAnimated:YES]; 
} 

@end 

我跑的应用程序没有做什么，我在上面写，导致main.m文件中出现NSException。

我在这里做错了什么？

编辑

main.m 

#import <UIKit/UIKit.h> 

#import "AppDelegate.h" 

int main(int argc, char * argv[]) 
{ 
@autoreleasepool { 
    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 
} 
} 

编辑

2014年5月17日14：56：47.509对myApp [1424：60B] *终止应用程序由于未捕获的异常 'NSUnknownKeyException'，原因：'[setValue：forUndefinedKey：]：此类不是关键图像的关键字编码兼容值。'

Answer 1

检查Interface Builder（IB）中IBOutlet customImage的连接，并确保引用插座的名称和UIImageView匹配。您可以点击IB中的Connection Inspector进行检查（这是一个圆圈内的小箭头）。

在您发布链接的教程中，显示​​IBOutlet UIImageView声明为image。我假设你更改了IBOutlet的名称并忘记重新连接它。您也可以检查IBOutlet customImage是否已连接，方法是检查属性声明旁边的点是否已填充或为空。填充=已连接，空=未连接。属性声明为一个IBOutlet的

实施例：

@property (weak, nonatomic) IBOutlet UIImageView * customImage; 

另外，<UINavigationControllerDelegate, UIImagePickerControllerDelegate>是协议。通过将这些行添加到@interface声明中，您非常简单地指出：“我希望我的UIViewController符合UINavigationControllerDelegate和UIImagePickerControllerDelegate。我还希望在发生某些事件时实现自己的代码。”