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UIUserInterfaceStyle key invalid

I tried to validate an app in Xcode 10.3, and got an error:Invalid Info.plist Key. The key 'UIUserInterfaceStyle' in the Payload/AppName.appInfo.plist file is not valid.No problem yesterday with the same key.
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by yvsong.
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Standard colors on watchOS

UI element colors and standard colors (UIColor properties) are unavailable on watchOS. If I use them on iOS, how to match the colors on watchOS?
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by yvsong.
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1.4k Views

Local var in GeometryReader

GeometryReader { geometry in let len = geometry.size.width * 0.4 Path { path in ... } }breaks the compiler in Xcode 11 beta 4. Without line 2 it passes compilation. Is it not permitted to declare local contants and variables in GeometryReader?
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by yvsong.
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2.3k Views

UIColor -> Color

How to convert a UIColor to Color for use in SwiftUI?
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by yvsong.
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viewWillTransition before viewDidLoad

When launching an app in landscape, viewWillTransition(to:with:) is called before viewDidLoad(). Is this normal?
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by yvsong.
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465 Views

Array max()

Does max() sort the array first?
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by yvsong.
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337 Views

CILabDeltaE

https://developer.apple.com/videos/play/wwdc2017/510/ mentions CILabDeltaE. Where is the documentation?
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by yvsong.
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1.1k Views

Image Dictionary Keys

In the description of options property, there is "See Image Dictionary Keys." Where is the documentation for the keys?
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by yvsong.
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cooking.valid

Using Xcode 9 beta 6, I noticed a new file cooking.valid in my iOS project directory, with the content 0 0 0 totalWhat's it for?
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by yvsong.
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292 Views

Non-texture output

Does Metal support parallel processing of an input texture to produce a non-texture output? For example, generating a string from the pixel values?
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by yvsong.
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