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暂且不回答这个问题。

我想我已经找到了问题的一部分。

当我尝试将它创建的自动生成的 .xib 文件重命名_为 use时，XCode 再次中止~。Xcode 在中止时似乎至少破坏了一个 .xib 文件，并且该文件包含应用程序所需的最小视图或窗口对象。尽管丢失的 .xib 文件已从 Finder 中消失，但它仍显示在导航器中。

所以现在，我将不理会这些_文件，然后再试一次，但不要使用我之前得到的建议。

更新 0

按照此处的建议更改了以下代码，我的 xib 遇到了问题。 我怀疑问题来自将 xib 名称更改为使用 '~' 而不是 '_' 并且无法修改引用 xib 名称的相应代码。

问题也可能是我有以下 4 个文件名，这可能会让 Xcode 感到困惑？

BSViewController.h/.m

BSViewController~iPhone.xib

BSViewController~iPad.xib

原始代码是.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        self.viewController = [[BSViewController alloc] initWithNibName:@"BSViewController_iPhone" bundle:nil];
    } else {
        self.viewController = [[BSViewController alloc] initWithNibName:@"BSViewController_iPad" bundle:nil];
    }
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

修改后的代码（包括额外的）是.

#import "BSAppDelegate.h"

#import "BSViewController.h"
@implementation BSAppDelegate
@synthesize window;
@synthesize viewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.viewController = [[BSViewController alloc] initWithNibName:@"BSViewController" bundle:nil];
    [self.window addSubview:viewController.view];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

BSAppDelegate.h 紧随其后。

#import <UIKit/UIKit.h>

@class BSApp;
@class BSViewController;
@interface BSAppDelegate : NSObject <UIApplicationDelegate>{
    UIWindow *window;
    BSViewController *viewController;
}
@property (retain, nonatomic) IBOutlet UIWindow *window;
@property (retain, nonatomic) IBOutlet BSViewController *viewController;
@end

BSViewController.h 紧随其后。

#import <UIKit/UIKit.h>

@interface BSViewController : UIViewController<UIImagePickerControllerDelegate, UINavigationControllerDelegate> {
    UIImage *workingImage;
    IBOutlet UIImageView *imageView;
}

@property (nonatomic, retain) UIImage *workingImage;
@property (nonatomic, retain) IBOutlet UIImageView *imageView;

+ (BOOL)isCameraDeviceAvailable;
- (IBAction) chooseImage:(id) sender;
- (IBAction) grayscale:(id) sender;

@end

BSViewController.m 紧随其后。

#import "BSViewController.h"

@interface BSViewController ()

@end

@implementation BSViewController

@synthesize imageView;
@synthesize workingImage;

+(BOOL)isCameraDeviceAvailable
{
    BOOL isCameraAvailable=NO;
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
        if([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront] )
            isCameraAvailable = YES;
    }
    return isCameraAvailable;
}

- (IBAction) chooseImage:(id) sender {
    [self.view addSubview: self.imageView];
    UIImage* testCard = [UIImage imageNamed:@"ipad 7D.JPG"];
    CGImageRef num = CGImageCreateWithImageInRect([testCard CGImage],CGRectMake(532, 0, 104, 104));
    UIGraphicsBeginImageContext(CGSizeMake( 250,650));
    CGContextRef con = UIGraphicsGetCurrentContext();
    CGContextDrawImage(con, CGRectMake(0, 0, 13, 13) ,num);
    UIImage* im = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    CGImageRelease(num);
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    self.workingImage = [info objectForKey:UIImagePickerControllerOriginalImage];
    [imageView setImage:self.workingImage];
    [picker dismissViewControllerAnimated:YES completion:nil];
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
    self.imageView = nil;
}
- (void)dealloc {
    [workingImage release];
    [imageView release];
    [super dealloc];
}

@end

我正在使用 Xcode 4.5.2 并为 iOS 6 设计。

在我的BSViewController~iPad.xib中，我添加了一个“ViewController”对象，单击该对象会产生 2 个 Outlets：“searchDisplayController”和“view”。没有“视图”顶级对象；当我尝试将“+”拖到“文件所有者”时，我没有得到任何结果，可能也不应该得到结果。

在我的BSViewController~iPhone.xib我已经有一个“窗口”对象，不知道这是否好或需要添加到〜iPad.xib（但我不知道如何）。

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