How do you stroke text using AttributedString in iOS 15?-CodePudding

iOS 15 includes support for

Documentation mentions

CodePudding user response：

We have to use attributes from SwiftUI AttributeScopes.

Here are all attributes supported now by SwiftUI and (stroke* are not presented in the list, although it replicates some attributes from UIKit scope):

extension AttributeScopes {

    /// A property for accessing the attribute scopes defined by SwiftUI.
    @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
    public var swiftUI: AttributeScopes.SwiftUIAttributes.Type { get }

    /// Attribute scopes defined by SwiftUI.
    @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
    public struct SwiftUIAttributes : AttributeScope {

        /// A property for accessing a font attribute.
        public let font: AttributeScopes.SwiftUIAttributes.FontAttribute

        /// A property for accessing a foreground color attribute.
        public let foregroundColor: AttributeScopes.SwiftUIAttributes.ForegroundColorAttribute

        /// A property for accessing a background color attribute.
        public let backgroundColor: AttributeScopes.SwiftUIAttributes.BackgroundColorAttribute

        /// A property for accessing a strikethrough style attribute.
        public let strikethroughStyle: AttributeScopes.SwiftUIAttributes.StrikethroughStyleAttribute

        /// A property for accessing an underline style attribute.
        public let underlineStyle: AttributeScopes.SwiftUIAttributes.UnderlineStyleAttribute

        /// A property for accessing a kerning attribute.
        public let kern: AttributeScopes.SwiftUIAttributes.KerningAttribute

        /// A property for accessing a tracking attribute.
        public let tracking: AttributeScopes.SwiftUIAttributes.TrackingAttribute

        /// A property for accessing a baseline offset attribute.
        public let baselineOffset: AttributeScopes.SwiftUIAttributes.BaselineOffsetAttribute

        /// A property for accessing attributes defined by the Accessibility framework.
        public let accessibility: AttributeScopes.AccessibilityAttributes

        /// A property for accessing attributes defined by the Foundation framework.
        public let foundation: AttributeScopes.FoundationAttributes

        public typealias DecodingConfiguration = AttributeScopeCodableConfiguration

        public typealias EncodingConfiguration = AttributeScopeCodableConfiguration
    }
}

CodePudding user response：

strokeWidth in AttributedString doesn't work with SwiftUI.

I asked similar question on Twitter after WWDC 2021 and I got a reply from Foundation Engineer at Apple. This was the reply:

.strokeWidth is an AppKit/UIKit defined attribute so it isn’t guaranteed to work with SwiftUI automatically. You can find all of the attributes supported by SwiftUI at https://developer.apple.com/documentation/foundation/attributescopes/swiftuiattributes

If you want to use stroked text with SwiftUI, you will need to use UIViewRepresentable view as a workaround. Create a UILabel and set a NSAttributedString with strokeWidth to attributedText property of UILabel.