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私はObjective-Cに慣れていないので、最終的にはカメラで写真を撮りますが、画像がオーバーレイされたアプリを作成したいと考えています。しかし、ベースとなる単純なカメラ アプリから始めようと思いました。写真を撮って画像ライブラリにアクセスできるアプリを作成するためのチュートリアルに従いました。しかし、iPhone 4s にビルドすると、白い画面が読み込まれます。誰かがコードを見ることができれば、私はそれが正しいと思い、答えを提供してくれます。

//ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

<UIImagePickerControllerDelegate, UINavigationControllerDelegate>


@property (strong, nonatomic) IBOutlet UIImageView *imageView;

- (IBAction)takePhoto:(UIButton *)sender;

- (IBAction)selectPhoto:(UIButton *)sender;


@end

//ViewController.m

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

        UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Error"
                                                              message:@"Device has no camera"
                                                             delegate:nil
                                                    cancelButtonTitle:@"OK"
                                                    otherButtonTitles: nil];

        [myAlertView show];

    }

}

- (void)viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];

}

- (IBAction)takePhoto:(UIButton *)sender {

    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;

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

}

- (IBAction)selectPhoto:(UIButton *)sender {

    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

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


}

#pragma mark - Image Picker Controller delegate methods

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
    self.imageView.image = chosenImage;

    [picker dismissViewControllerAnimated:YES completion:NULL];

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {

    [picker dismissViewControllerAnimated:YES completion:NULL];

}

@end
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