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# Xcode 11.3 Release Notes

Update your apps to use new features, and test your apps against API changes

## Overview

Xcode 11.3 supports developing apps for iOS 13.3, iPadOS 13.3, tvOS 13.3, watchOS
6.1, and macOS Catalina 10.15.2. Xcode 11.3 supports on-device debugging for iOS
8 and later, tvOS 9 and later, and watchOS 2 and later. Xcode 11.3 requires a Mac
running macOS Mojave 10.14.4 or later.

### General

#### New Features

- You can configure the Touch Bar simulator to simulate either 1st generation or
  2nd generation Touch Bars. (53885368)

#### Known Issues

- When you create an Objective-C category file by choosing File > New > File…, the
  newly created file includes an import of the AppKit framework. This causes a compilation
  error for iOS, tvOS, and watchOS. (55977950) (FB7346800)
  
  **Workaround**: Remove the import of AppKit from the source file.

### Create ML

#### New Features

- A Recommender template is available in Create ML, joining the Image, Sound, Activity,
  Text and Tabular Classification, Object Detection, Word Tagging and Tabular Regression
  templates. (56912822)

### Interface Builder

#### Known Issues

- The color picker panel does not respond to choosing a color while a text field
  in the inspector has insertion focus. (56067005) (FB7358220)
  
  **Workaround**: Click the Interface Builder canvas to remove focus from the text
  field, then choose a color in the panel.

#### Resolved Issues

- Setting the Selected Segment Tint Color of a segmented control in Interface Builder
  to a named color doesn’t cause a failure when the view loads on iOS 12 and
  earlier. (55254963, 55951374)
- Fixed rendering issues for scenes with large simulated metric free-form
  sizes. (56920189)

### Previews

#### New Features

- Xcode Previews now use a platform-provided scroll view for the canvas content when
  running on macOS Catalina 10.15.2 or newer. This change makes it possible to
  scroll through the canvas using a scroll wheel on a mouse, as well as by dragging
  horizontal and vertical scrollbars. (53962570)

### Simulator

#### Known Issues

- Third party “endpoint security” software may cause slow simulators, system freezes,
  or prevent debug processes from running in simulators reliably. This sometimes
  manifests as `debugserver` disconnections, or sends simulator applications a
  `SIGKILL` signal. (55853555)
  
  **Workaround**: Uninstall the third party software.
- Under certain network conditions, GateKeeper may block simulators from booting,
  and show error code 60 `"launchd` failed to respond.” (55878667)
  
  **Workaround**: Try to boot the simulator again. Disabling WiFi or disconnecting
  from any active VPNs may resolve the problem.
- When a new Mac Pro has multiple GPUs, Simulator assigns each booted simulator to
  one of the available GPUs. (56488185)

### Swift Packages

#### Resolved Issues

- You can now submit iOS, tvOS, or watchOS apps with a Swift Package that builds
  a dynamic library. (55564324) (FB7303066)

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