如何在 iPhone 中使用移动和缩放 UIImagePickerController？答案

【问题标题】：How to use move and scale UIImagePickerController in iPhone?如何在 iPhone 中使用移动和缩放 UIImagePickerController？
【发布时间】：2012-05-14 01:51:51
【问题描述】：

我是 iPhone 开发的新手。我正在使用图像选择器控制器，我想在其中移动和缩放从照片库中选择的图像，所以我启用了allowsediting = yes。

我的选择器确实完成了方法：

 - (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    // Access the uncropped image from info dictionary

    UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
    self.imgForDisplay.image=[self scaleAndRotateImage:image];
    self.imagePicker.allowsEditing = YES;


    ImageDetailsViewController *imageDetailsVC = [[ImageDetailsViewController alloc] init];
    imageDetailsVC.imagedisplay.image = self.imgForDisplay.image;
    [picker pushViewController:imageDetailsVC animated:YES];



//[picker dismissModalViewControllerAnimated:YES];

}

然后我推动另一个视图控制器，我想在其中显示选取的图像。

这里有两个问题：

1) 当我选择图像时，它导航到另一个没有“移动和缩放”屏幕的视图，但图像现在在导航时显示在 ImageDetailsViewController 中。

2) 当我再次导航并选择另一个图像时，现在它显示“移动和缩放”屏幕。当我点击选择按钮时，它只是显示一个没有导航栏的白屏。

有没有办法设置选择按钮的动作？

【问题讨论】：

标签： iphone ios uinavigationcontroller uiimagepickercontroller

【解决方案1】：

我也遇到了同样的问题，我通过使用代码解决了它，通过这个它会很有用。

 - (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.image = shrunkenImage; 
        } else if ([lastChosenMediaType isEqual:(NSString *)kUTTypeMovie]) { 
            self.movieURL = [info objectForKey:UIImagePickerControllerMediaURL]; 
        } 

        ImageSelectionView *imageSelectionVC = [[ImageSelectionView alloc] init];
        imageSelectionVC.theImage = image;
        [picker pushViewController:imageSelectionVC animated:YES];
        imageSelectionVC.dismissDelegate =self;


       // [picker dismissModalViewControllerAnimated:YES]; 
    }

-(void)updateDisplay { 
    if ([lastChosenMediaType isEqual:(NSString *)kUTTypeImage]) { 
        imageView.image = image; 
        imageView.hidden = NO; 
        moviePlayerController.view.hidden = YES; 
    } else if ([lastChosenMediaType isEqual:(NSString *)kUTTypeMovie]) { 
        [self.moviePlayerController.view removeFromSuperview]; 
        self.moviePlayerController = [[MPMoviePlayerController alloc] 
                                       initWithContentURL:movieURL] ; 
        moviePlayerController.view.frame = imageFrame; 
        moviePlayerController.view.clipsToBounds = YES; 
        [self.view addSubview:moviePlayerController.view]; 
        imageView.hidden = YES; 
    } 
}

【讨论】：

方法shrinkImage从何而来？从这一行开始： UIImage *shrunkenImage = shrinkImage(chosenImage, imageFrame.size);

【解决方案2】：

我认为你最好像这样展示你的选择器模式：

 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]){
    UIImagePickerController * picker = [[UIImagePickerController alloc] init];

    picker.allowsEditing = YES;
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentModalViewController:picker animated:YES];

然后让您的图像显示在显示它的视图控制器的视图中。

【讨论】：

【解决方案3】：

-(IBAction)Btn_AddImage:(id)sender
{
    UIImagePickerController *Image_Picker=[[UIImagePickerController alloc]init];
    Image_Picker.delegate=self;
    Image_Picker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentViewController:Image_Picker animated:YES completion:Nil];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSData  *Data=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"], 1);
    UIImage *Cust_Image=[[UIImage alloc]initWithData:Data];
    Profile_Image.image=Cust_Image;
    [picker dismissViewControllerAnimated:YES completion:Nil];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:Nil];
}

【讨论】：