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Description

The SwiftUI is a great UI development framework for the iOS app. After I wrote some to-be-released app with the SwiftUI framework, I realized that I need a solution to write more clear, simple, view-style-decoupled code with lots of custom style design.

So here is SwiftUI-CSS.

Programming language: Swift
Tags: Swift     UI     SwiftUI     Decoupled     CSS    
Latest version: v1.1.3

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README

The missing CSS-like module for SwiftUI

Check out the example project using SwiftUI-CSS; Also, Swift Package availble which url is https://github.com/hite/SwiftUI-CSS

The SwiftUI is a great UI development framework for the iOS app. After I wrote some to-be-released app with SwiftUI framework, I realized that I need a solution to write more clear, simple, view-style-decoupled code with lots of custom style design.

So here is SwiftUI-CSS. With SwiftUI-CSS, you can:

1. write View-style-decoupled codes

View-style-decoupled makes your source code more clear to read, easy to refactor like html with CSS support.

Without SwifUI-CSS:

The codes to define View Structure blend into style-defined codes.

             Image("image-swift")
                 .resizable()
                 .scaledToFit()
                 .frame(width:100, height:100)
                 .cornerRadius(10)
                 .padding(EdgeInsets(top: 10, leading: 0, bottom: 15, trailing: 0))

              Text("Swift")
                 .font(.headline)
                 .foregroundColor(Color(red: 0x33/0xff, green: 0x33/0xff, blue: 0x33/0xff))
                 .padding(.bottom, 10)


              Text("Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, macOS, watchOS, tvOS, Linux, and z/OS. ")
                 .font(.footnote)
                 .padding(.horizontal, 10)
                 .foregroundColor(NormalDescColor)
                 .lineSpacing(2)
                 .frame(minHeight: 100, maxHeight: .infinity)

With SwifUI-CSS:

  1. We divide the previous into two parts. The first part is view structures with class name:
            Image("image-swift")
                .resizable()
                .scaledToFit()
                .addClassName(languageLogo_clsName)

            Text("Swift")
                .addClassName(languageTitle_clsName)


            Text("Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, macOS, watchOS, tvOS, Linux, and z/OS. ")
                .addClassName(languageDesc_clsName)
  1. The another is style definition: ``` swift let languageLogo_clsName = CSSStyle([ .width(100), .height(100), .cornerRadius(10), .paddingTLBT(10, 0, 15,0) ])

let languageTitle_clsName = CSSStyle([ .font(.headline), .foregroundColor(Color(red: 0x33/0xff, green: 0x33/0xff, blue: 0x33/0xff)), .paddingEdges([.bottom], 10) ])

let languageDesc_clsName = CSSStyle([ .font(.footnote), .paddingHorizontal(10), .foregroundColor(NormalDescColor), .lineSpacing(2), .flexHeight(min: 50, max: .infinity) ])

## 2. use module system for reuse or create a custom design system.
*module system* help to reuse some common style design across the whole app which can save you to write same codes everywhere or avoid to make some mistakes.

### Without SwifUI-CSS:
If you change the style of Text("28 October 2014"), you must change the style of Text("Objective-C,[7] Rust, Haskell, Ruby, Python, C#, CLU,[8] D[9]") too.
```swift
// in html5.swift
                HStack() {
                    Text("Initial release:")
                        .font(Font.system(size: 14))

                    Text("28 October 2014")
                    .font(Font.system(size: 12))
                    .foregroundColor(NormalDescColor)

                }
// in swift.swift
                HStack(alignment: .top) {
                    Text("Influenced by:")
                        .font(Font.system(size: 14))

                    Text("Objective-C,[7] Rust, Haskell, Ruby, Python, C#, CLU,[8] D[9]")
                    .font(Font.system(size: 12))
                    .foregroundColor(NormalDescColor)

                }

With SwiftUI-CSS

You can change the definition of wikiDesc_clsName once for all.

let wikiDesc_clsName = CSSStyle([
    .font(Font.system(size: 12)),
    .foregroundColor(NormalDescColor)
])

// in html5.swift
                HStack() {
                    Text("Initial release:")
                        .font(Font.system(size: 14))

                    Text("28 October 2014")
                    .addClassName(wikiDesc_clsName)

                }
// in swift.swift
                HStack(alignment: .top) {
                    Text("Influenced by:")
                        .font(Font.system(size: 14))

                    Text("Objective-C,[7] Rust, Haskell, Ruby, Python, C#, CLU,[8] D[9]")
                    .addClassName(wikiDesc_clsName)

                }

the other benefits of using SwiftUI-CSS

  1. more easy to change a lot of styles when state change. ``` swift // without swiftui-css if festival == 'Christmas' { Text("Welcome everyone!") .font(.largeTitle) .foreground(.white) .background(.red) } else { Text("Welcome everyone!") .font(.title) .foreground(.darkGray) .background(.white) }

// with Text("Welcome everyone!") .addClassName(fesitval == 'Christmas' ? chrismas_clsName: normal_clsName)

2. Maybe a reachable way to convert html+css codes  to swiftui source
3. write less code, clear to tell parameters meanings. For example. 
> `.frame(minHeight: 50, maxheight: .infinity` to `.flexHeight(min: 50, max: .infinity)`
> `.padding(EdgeInset(top:10, leading: 15, bottom:0, trailing: 20)` to `.paddingTLBT(10,15,0,20)`
4. You can combile some different style into one.
```swift
let fontStyle = CSSStyle([.font(.caption)])
        let colorStyle = CSSStyle([.backgroundColor(.red)])

        let finalStyle = fontStyle + colorStyle
        print("finalStyle = \(finalStyle)")
  1. (to be continued)