实战需求

SwiftUI 精品完成项目之宠物展示与领养App

本文价值与收获

看完本文后，您将能够作出下面的界面

home-screen.png home-screen-dark.png details-screen.png details-screen-dark.png Jietu20210303-155225.gif

看完本文您将掌握的技能

• 自定义字体

import SwiftUI

enum SailecFontType: String {
    case bold = "Sailec-Bold"
    case medium = "Sailec-Medium"
    case regular = "Sailec"
}

struct SailecFont: ViewModifier {
    
    var type: SailecFontType
    var size: CGFloat
    
    init(_ type: SailecFontType = .regular, size: CGFloat = 16) {
        self.type = type
        self.size = size
    }
    
    func body(content: Content) -> some View {
        content.font(Font.custom(type.rawValue, size: size))
    }
}

• 自定义颜色

extension Color {
    
    static let main_color = Color("main_color")
    static let primary_color = Color("primary")
    static let secondary_color = Color("secondary")
    static let text_primary_color = Color("text_primary_color")
    static let placeholder_color = Color(UIColor(red: 189/255, green: 189/255, blue: 189/255, alpha: 1.0))
    
    static let red_color = Color(UIColor(red: 235/255, green: 87/255, blue: 87/255, alpha: 1.0))
    static let blue_color = Color(UIColor(red: 0/255, green: 106/255, blue: 246/255, alpha: 1.0))
    
    static let red_color_trans = Color(UIColor(red: 235/255, green: 87/255, blue: 87/255, alpha: 0.1))
    static let blue_color_trans = Color(UIColor(red: 0/255, green: 106/255, blue: 246/255, alpha: 0.1))
    
    init(hex: String, alpha: Double = 1) {
        var cString: String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()
        if (cString.hasPrefix("#")) { cString.remove(at: cString.startIndex) }
        
        let scanner = Scanner(string: cString)
        scanner.currentIndex = scanner.string.startIndex
        var rgbValue: UInt64 = 0
        scanner.scanHexInt64(&rgbValue)
        let r = (rgbValue & 0xff0000) >> 16
        let g = (rgbValue & 0xff00) >> 8
        let b = rgbValue & 0xff
        self.init(.sRGB, red: Double(r) / 0xff, green: Double(g) / 0xff, blue:  Double(b) / 0xff, opacity: alpha)
    }
}

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基础知识