Migrating UIKit Controls to XAML

#Status of the migration of UIKit controls to XAML We announced back in July that part of our new UIKit approach included re-implementing the UIKit controls to have them backed by XAML controls. So far, we migrated UITextField, UISlider, UIActivityIndicatorView, UIScrollView and UIButton. We created issues on GitHub when publishing some of these changes but we also wanted to share here a full status of what has been done so far and what's coming next.

UITextField

The XAML-backed implementation of UITextField (using XAML Textbox and PasswordBox controls) was first released on May 5, 2016 and you can find more details about what methods and properties are supported with this implementation here. One thing we lost with the new implementation is the participation of the UITextField control in the iOS hit-testing mechanism. That means, for instance, that scrolling on a UITextField embedded in a view will no longer trigger the view to scroll. The view will only scroll if the gesture is being done outside of the UITextField.

UISlider

The XAML-backed implementation of UISlider (using a XAML Slider) was first released on July 5, 2016 and here's the list of changes that came with this new implementation:

Feature	Previous Implementation	XAML-backed Implementation
value	Yes	Yes
minimumValue	Yes	Yes
maximumValue	Yes	Yes
continuous	Yes	Yes
minimumTrackTintColor	No	No
maximumTrackTintColor	No	No
thumbTintColor	No	Yes
minimumValueImage	Yes	No
maximumValueImage	Yes	No
currentMinimumTrackImage	Yes	No
currentMaximumTrackImage	No	No
currentThumbImage	Yes	No
- setValue:animated:	Partial	Partial
- setMaximumTrackImage:forState:	Yes	No
- setMinimumTrackImage:forState:	Yes	No
- setThumbImage:forState:	Yes	No
- thumbImageForState:	No	No
- maximumTrackImageForState:	No	No
- minimumTrackImageForState:	No	No
trackRectForBounds	No	No
minimumValueImageRectForBounds	No	No
maximumValueImageRectForBounds	No	No
thumbRectForBounds:trackRect:value	No	No

UIActivityIndicatorView

The XAML-backed implementation of UIActivityIndicatorView (using a XAML Progress Ring) was first released on July 5, 2016 and here's the list of changes that came with this new implementation:

Feature	Previous Implementation	XAML-backed Implementation
- initWithActivityIndicatorStyle	Caveat	Yes
- initWithCoder:	Yes	Yes
- initWithFrame:	Yes	Yes
- startAnimating	Yes	Yes
- stopAnimating	Yes	Yes
activityIndicatorViewStyle	Yes	Yes
color	Yes	Yes
hideWhenStopped	Yes	Caveat
isAnimating	Yes	Yes
UIActivityIndicatorViewStyleGray	Yes	Yes
UIActivityIndicatorViewStyleWhite	Yes	Yes
UIActivityIndicatorViewStyleWhiteLarge	Yes	Yes

UIScrollView

The XAML-backed implementation of UIScrollView (using a XAML ScrollViewer control) was first published on September 6, 2016 and here is the list of changes that came with this implementation:

Feature	Previous Implementation	XAML-backed Implementation
- setContentOffset:animated:	Yes	Yes
contentOffset	Yes	Yes
contentSize	Yes	Yes
contentInset	Yes	Yes
scrollEnabled	Yes	Yes
directionalLockEnabled	No	Yes
scrollsToTop	No	No
- scrollRectToVisible:animated:	Yes	Yes
pagingEnabled	Yes	Yes
bounces	Yes	No
alwaysBounceVertical	Yes	No
alwaysBounceHorizontal	Yes	No
- touchesShouldBegin:withEvent:inContentView:	No	No
- touchesShouldCancelInContentView:	No	No
delaysContentTouches	No	No
decelerationRate	No	No
dragging	Yes	Yes
tracking	Yes	Yes
decelerating	Yes	Yes
indicatorStyle	No	No
showsHorizontalScrollIndicator	Yes	Yes
showsVerticalScrollIndicator	Yes	Yes
- flashScrollIndicators	No	No
panGestureRecognizer	Yes	No
pinchGestureRecognizer	Yes	No
- zoomToRect:animated:	Yes	Yes
zoomScale	Yes	Yes
- setZoomScale:animated:	Yes	Yes
maximumZoomScale	Yes	Yes
minimumZoomScale	Yes	Yes
zoomBouncing	Yes	No
zooming	Yes	Yes
bouncesZoom	Yes	No
Double tap auto-zooming	Yes	Yes
delegate	Yes	Yes
- scrollViewDidScroll:	Yes	Yes
- scrollViewWillBeginDragging:	Yes	Yes
- scrollViewWillEndDragging:withVelocity:targetContentOffset:	Yes	Yes
- scrollViewDidEndDragging:willDecelerate:	Yes	Yes
- scrollViewShouldScrollToTop:	No	No
- scrollViewDidScrollToTop:	No	No
- scrollViewWillBeginDecelerating:	Yes	Yes
- scrollViewDidEndDecelerating:	Yes	Yes
- viewForZoomingInScrollView:	Yes	Yes
- scrollViewWillBeginZooming:withView:	Yes	Yes
- scrollViewDidEndZooming:withView:atScale:	Yes	Yes
- scrollViewDidZoom:	Yes	Yes
- scrollViewDidEndScrollingAnimation:	Yes	Yes
keyboardDismissMode	No	No

UIButton

The XAML-backed implementation of UIButton (using a XAML Image and a XAML TextBlock controls) was first published on November 7,2016 and here is the list of changes that came with this implementation. It's also worth noting that the default behavior where a system type UIButton will be dimmed when pressed on iOS is not supported by the bridge (but this behavior can easily be implemented in your app).

Feature	Previous Implementation	XAML-backed Implementation
adjustsImageWhenDisabled	No	No
adjustsImageWhenHighlighted	No	No
- attributedTitle:forState	No	No
- backgroundImageForState:	Yes	Yes
- backgroundRectForBounds:	No	No
buttonType	Yes	No
+ buttonWithType:	Yes	Caveat: Type not fully supported
contentEdgeInsets	Yes	Yes
- contentRectForBounds:	Yes	Yes
currentAttributedTitle	No	No
currentBackgroundImage	Yes	Yes
currentImage	Yes	Yes
currentTitle	Yes	Yes
currentTitleColor	Yes	Yes
currentTitleShadowColor	No	No
font	Yes	Yes
imageEdgeInsets	Yes	Yes
- imageForState:	Yes	Yes
- imageRectForContentRect:	Yes	Yes
imageView	Yes	Caveat: Returns a mock UIImageView that proxies some common properties and selectors to the underlying Image
lineBreakMode	No	No
reversesTitleShadowWhenHighlighted	No	No
- setAttributedTitle:forState	No	No
- setBackgroundImage:forState	Yes	Yes
- setImage:forState:	Yes	Yes
- setTitle:forState:	Yes	Yes
- setTitleColor:forState:	Yes	Yes
- setTitleShadowColor:forState:	No	No
showsTouchWhenHighlighted	No	No
tintColor	No	No
- titleColorForState:	Yes	Yes
titleEdgeInsets	Yes	Yes
- titleForState:	Yes	Yes
titleLabel	Yes	Caveat: Returns a mock UILabel that proxies some common properties and selectors to the underlying TextBlock
- titleRectForContentRect:	Yes	Yes
- titleShadowColorForState:	No	No
titleShadowOffset	No	No
touchesBegan:withEvent:	Yes	Yes
touchesCancelled:withEvent:	Yes	Yes
touchesEnded:withEvent:	Yes	Yes
touchesMoved:withEvent:	Yes	Yes