Question

用户使用相机拍摄照片（UIImagePickerController）。但是，我无法裁剪它 - 或者我尝试，它会返回完全相同的照片。

在viewDidAppear我创建了图像选择器控制器：

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
    ipc = [[UIImagePickerController alloc] init];
    ipc.delegate = self;

    ipc.sourceType = UIImagePickerControllerSourceTypeCamera;
    ipc.showsCameraControls = NO;

    [[NSBundle mainBundle] loadNibNamed:@"SnapItCameraView" owner:self options:nil];
    self.overlayView.frame = ipc.cameraOverlayView.frame;
    ipc.cameraOverlayView = self.overlayView;
    self.overlayView = nil;
    CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 71.0); 
    ipc.cameraViewTransform = translate;
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    CGFloat screenHeight = screenRect.size.height;
    CGFloat scaleCamera = screenHeight / 426;

    CGAffineTransform scale = CGAffineTransformScale(translate, scaleCamera, scaleCamera);
    ipc.cameraViewTransform = scale;
    ipc.showsCameraControls = NO;
    ipc.tabBarController.tabBar.hidden = YES;
    ipc.allowsEditing = YES;
    [ipc setAllowsEditing:YES];

    [self presentViewController:ipc animated:YES completion:nil];
}

在didFinishPickingMediaWithInfo

UIImage* theImage = [info objectForKey:UIImagePickerControllerOriginalImage];
UIImageWriteToSavedPhotosAlbum(theImage, nil, nil, nil);             
[self ordinaryCrop:theImage toRect:CGRectMake(20, 0, 250, 250)];
UIImageWriteToSavedPhotosAlbum(theImage, nil, nil, nil);

剪切：

-(UIImage *)ordinaryCrop:(UIImage *)imageToCrop toRect:(CGRect)cropRect
{
    CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], cropRect);
    UIImage *cropped = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);
    return cropped;
}

但裁剪后图像完全相同。我尝试了解决方案in this post，但是 UIImage* theImage = [info objectForKey:UIImagePickerControllerEditedImage];返回nil

It's different from [this post][2] because, as the bounty answer points out,

＆＃34;如果选择图像，则AllowEditing属性只允许用户裁剪为正方形。＆＃34;用户没有选择图像，我并没有特别尝试裁剪到正方形。我试图完全裁剪它。

Answer 1

您从cropped功能返回ordinaryCrop，但在didFinishPickingMediaWithInfo中没有对其执行任何操作，只需再次保存原始图像。

你想要的是：

UIImage* theImage = [info objectForKey:UIImagePickerControllerOriginalImage];
UIImageWriteToSavedPhotosAlbum(theImage, nil, nil, nil);             
UIImage *croppedImage = [self ordinaryCrop:theImage toRect:CGRectMake(20, 0, 250, 250)];
UIImageWriteToSavedPhotosAlbum(croppedImage, nil, nil, nil);

Answer 2

选择UIButton并尝试：

<强> 1

 UIButton *addImage_Button;

<强> 2

-(IBAction)addImage_Button:(id)sender
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES; //THIS IS FOR CROPPING
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentViewController:picker animated:YES completion:NULL];
}

3。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *chosenUserImage = info[UIImagePickerControllerEditedImage];
    chosenUserImage = [chosenUserImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    addImage_Button.imageView.contentMode = UIViewContentModeScaleAspectFill;
    [addImage_Button setImage:chosenUserImage forState:UIControlStateNormal];
    [picker dismissViewControllerAnimated:YES completion:NULL];

}

<强> 4

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

UIImage不会收获作物

2 个答案: