UIImagePicker allowsEditing stuck in center

Question

I have a UIImagePicker that works perfect for a type of UIImagePickerControllerSourceTypePhotoLibrary, but when I use UIImagePickerControllerSourceTypeCamera, the editing bo

Answer 1

I know, this is not a good solution, but it works.

I tested on iOS8+iPhone5, iOS9+iPhone6sPlus, iOS10+iPhone6, iOS10+iPhone6sPlus.

CAUTION: PLImageScrollView and PLCropOverlayCropView are UNDOCUMENTED classes.

- (void)showImagePickerControllerWithSourceType:(UIImagePickerControllerSourceType)sourceType {
    UIImagePickerController *imagePickerController = [UIImagePickerController new];
    imagePickerController.sourceType = sourceType;
    imagePickerController.mediaTypes = @[(NSString *)kUTTypeImage];
    imagePickerController.allowsEditing = YES;
    imagePickerController.delegate = self;
    [self presentViewController:imagePickerController animated:YES completion:^{
        [self fxxxImagePickerController:imagePickerController];
    }];
}

- (void)fxxxImagePickerController:(UIImagePickerController *)imagePickerController {
    if (!imagePickerController
        || !imagePickerController.allowsEditing
        || imagePickerController.sourceType != UIImagePickerControllerSourceTypeCamera) {
        return;
    }

    // !!!: UNDOCUMENTED CLASS
    Class ScrollViewClass = NSClassFromString(@"PLImageScrollView");
    Class CropViewClass = NSClassFromString(@"PLCropOverlayCropView");

    [imagePickerController.view eachSubview:^BOOL(UIView *subview, NSInteger depth) {
        if ([subview isKindOfClass:CropViewClass]) {
            // 0. crop rect position
            subview.frame = subview.superview.bounds;
        }
        else if ([subview isKindOfClass:[UIScrollView class]]
            && [subview isKindOfClass:ScrollViewClass]) {
            BOOL isNewImageScrollView = !self->_imageScrollView;
            self->_imageScrollView = (UIScrollView *)subview;
            // 1. enable scrolling
            CGSize size = self->_imageScrollView.frame.size;
            CGFloat inset = ABS(size.width - size.height) / 2;
            self->_imageScrollView.contentInset = UIEdgeInsetsMake(inset, 0, inset, 0);
            // 2. centering image by default
            if (isNewImageScrollView) {
                CGSize contentSize = self->_imageScrollView.contentSize;
                if (contentSize.height > contentSize.width) {
                    CGFloat offset = round((contentSize.height - contentSize.width) / 2 - inset);
                    self->_imageScrollView.contentOffset = CGPointMake(self->_imageScrollView.contentOffset.x, offset);
                }
            }
        }
        return YES;
    }];

    // prevent re-layout, maybe not necessary
    @weakify(self, imagePickerController);
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        @strongify(self, imagePickerController);
        [self fxxxImagePickerController:imagePickerController];
    });
}

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EDIT: The eachSubview: method traverses all the subviews tree.