ios - カメラまたはライブラリから選択した画像をトリミングする際の問題

Question

以下は、ソースから画像を取得してトリミングするために使用するコードです

これが私がソースと宛先を選択する方法です

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    //Get the name of the current pressed button
    NSString *buttonTitle = [actionSheet buttonTitleAtIndex:buttonIndex];


    if ([buttonTitle isEqualToString:@"Camera Library"]) {
        [self performSelector:@selector(pickImage:) ];
    }
    if ([buttonTitle isEqualToString:@"Camera"]) {
        [self performSelector:@selector(startcamera:) ];
    }
    if ([buttonTitle isEqualToString:@"Cancel"]) {
        NSLog(@"Cancel pressed --> Cancel ActionSheet");
    }

}



- (IBAction) pickImage:(id)sender
{

    if([UIImagePickerController isSourceTypeAvailable:
        UIImagePickerControllerSourceTypePhotoLibrary])
    {
        UIImagePickerController *picker= [[UIImagePickerController alloc]init];
        picker.delegate = self;
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentModalViewController:picker animated:YES];
        [picker release];
    }




}
- (void)imagePickerController:(UIImagePickerController *)picker 
didFinishPickingMediaWithInfo:(NSDictionary *)info {
    self.lastChosenMediaType = [info objectForKey:UIImagePickerControllerMediaType];
    if ([lastChosenMediaType isEqual:(NSString *)kUTTypeImage]) {
        UIImage *chosenImage = [info objectForKey:UIImagePickerControllerEditedImage];
        UIImage *shrunkenImage = shrinkImage(chosenImage, imageFrame.size);
        self.imagee = shrunkenImage;
        selectImage.image = imagee;
    }     
    [picker dismissModalViewControllerAnimated:YES];
}




-(void)imagePickerControllerDidCancel:(UIImagePickerController *) picker
{
    [picker dismissModalViewControllerAnimated:YES];
}


#pragma mark  -
static UIImage *shrinkImage(UIImage *original, CGSize size) {
    CGFloat scale = [UIScreen mainScreen].scale;
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef context = CGBitmapContextCreate(NULL, size.width * scale,
                                                 size.height * scale, 8, 0, colorSpace, kCGImageAlphaPremultipliedFirst);
    CGContextDrawImage(context,
                       CGRectMake(0, 0, size.width * scale, size.height * scale),
                       original.CGImage);
    CGImageRef shrunken = CGBitmapContextCreateImage(context);
    UIImage *final = [UIImage imageWithCGImage:shrunken];

    CGContextRelease(context);
    CGImageRelease(shrunken);   

    return final;
}

- (void)updateDisplay {
    if ([lastChosenMediaType isEqual:(NSString *)kUTTypeImage]) {
        imageView.image = imagee;
        imageView.hidden = NO;

    } 
}


- (IBAction) startcamera:(id)sender
{


    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {

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

        picker.allowsEditing=NO;

        [self presentModalViewController: picker animated:YES];


    }else {
        UIAlertView *alt = [[UIAlertView alloc] 
                            initWithTitle:@"Error" 
                            message:@"Camera Image Source Not Available" 
                            delegate:nil cancelButtonTitle:@"OK" 
                            otherButtonTitles:nil];
        [alt show];
        [alt release];
    }
}

updateDisplay このメソッドは viewDidAppear で呼び出されます。

今私の問題は、画像ピッカービューが開くことです。ライブラリ画像が表示されますが、選択すると閉じられ、トリミング画像画面に移動しませんはい、mobileCoreServiceフレームワークを使用しました