Fix UIImagePickerController allowEditing bug

xxx.m

@implementation UpdateAvatarViewController
{
    UIScrollView *cropImageScrollView;
}

-(void) chooseCameraPicture
{
    cropImageScrollView = nil;
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    picker.allowsEditing = YES;
  
    [self presentViewController:picker animated:YES completion:^{
        [self fixImagePicker:picker];
    }];
}


-(void) fixImagePicker:(UIImagePickerController *)imagePicker
{
    if (imagePicker.sourceType != UIImagePickerControllerSourceTypeCamera || imagePicker.allowsEditing == NO)
    {
        return;
    }
    
    if (cropImageScrollView)
    {
        CGSize size = cropImageScrollView.frame.size;
        CGFloat inset = ABS(size.width - size.height) / 2;
        cropImageScrollView.contentInset = UIEdgeInsetsMake(inset, 0, inset, 0);
        
        CGSize contentSize = cropImageScrollView.contentSize;
        if (contentSize.height > contentSize.width) {
            CGFloat offset = round((contentSize.height - contentSize.width) / 2 - inset);
            cropImageScrollView.contentOffset = CGPointMake(cropImageScrollView.contentOffset.x, offset);
        }
        return;
    }
    
    Class CropViewClass = [NSClassFromString(@"PLCropOverlayCropView") class];
    for (UIView *subview in [imagePicker.view allSubViews])
    {
        
        if ([subview isKindOfClass:CropViewClass]) {
            // 0. crop rect position
            subview.frame = subview.superview.bounds;
        }
        
        
        if ([subview isKindOfClass:[NSClassFromString(@"PLImageScrollView") class]])
        {
            cropImageScrollView = (UIScrollView *)subview;
        }
    }
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self fixImagePicker:imagePicker];
    });
}