如何在按钮边缘制作cornerRadius，以便在swiftUI中不会剪裁边缘

Question

我正在试验 SwiftUI。我不知道如何获得带边框宽度的圆形按钮。下面是我尝试过的代码。

这是我的代码

struct ArrowButton : View {
    var body: some View {
        return Button(action: {}) {
            HStack {
                Text("SEE ALL")
                    .font(.headline)
                    .color(Color.init(red: 0.627, green: 0.776, blue: 0.965))
                Image(systemName: "arrow.right")
                    .font(Font.title.weight(.bold))
            }
        }
            .padding(.all, 9.0)
            .border(Color.init(red: 0.627, green: 0.776, blue: 0.965))
            .cornerRadius(5.0)
    }
}

这是我的观点

我应该使用什么修饰符

1. 增加边框宽度？
2. 删除如下所示的剪辑效果？

Answer 1

针对 Swift 5 和 iOS 13.4+ 进行了更新，并带有新闻状态！

这些示例都不适用于具有深色和白色背景颜色的按钮，也没有一个具有按下状态更新，因此我构建了这个LargeButton视图，您可以在下面看到。

示例照片

使用示例

// White button with green border.
LargeButton(title: "Invite a Friend", 
            backgroundColor: Color.white, 
            foregroundColor: Color.green) {
                        print("Hello World")
                    }

// Yellow button without a border
LargeButton(title: "Invite a Friend", 
            backgroundColor: Color.yellow) {
                        print("Hello World")
                    }

代码

struct LargeButtonStyle: ButtonStyle {
    
    let backgroundColor: Color
    let foregroundColor: Color
    let isDisabled: Bool
    
    func makeBody(configuration: Self.Configuration) -> some View {
        let currentForegroundColor = isDisabled || configuration.isPressed ? foregroundColor.opacity(0.3) : foregroundColor
        return configuration.label
            .padding()
            .foregroundColor(currentForegroundColor)
            .background(isDisabled || configuration.isPressed ? backgroundColor.opacity(0.3) : backgroundColor)
            // This is the key part, we are using both an overlay as well as cornerRadius
            .cornerRadius(6)
            .overlay(
                RoundedRectangle(cornerRadius: 6)
                    .stroke(currentForegroundColor, lineWidth: 1)
        )
            .padding([.top, .bottom], 10)
            .font(Font.system(size: 19, weight: .semibold))
    }
}

struct LargeButton: View {
    
    private static let buttonHorizontalMargins: CGFloat = 20
    
    var backgroundColor: Color
    var foregroundColor: Color
    
    private let title: String
    private let action: () -> Void
    
    // It would be nice to make this into a binding.
    private let disabled: Bool
    
    init(title: String,
         disabled: Bool = false,
         backgroundColor: Color = Color.green,
         foregroundColor: Color = Color.white,
         action: @escaping () -> Void) {
        self.backgroundColor = backgroundColor
        self.foregroundColor = foregroundColor
        self.title = title
        self.action = action
        self.disabled = disabled
    }
    
    var body: some View {
        HStack {
            Spacer(minLength: LargeButton.buttonHorizontalMargins)
            Button(action:self.action) {
                Text(self.title)
                    .frame(maxWidth:.infinity)
            }
            .buttonStyle(LargeButtonStyle(backgroundColor: backgroundColor,
                                          foregroundColor: foregroundColor,
                                          isDisabled: disabled))
                .disabled(self.disabled)
            Spacer(minLength: LargeButton.buttonHorizontalMargins)
        }
        .frame(maxWidth:.infinity)
    }
}

Answer 2

该View.border(:width:cornerRadius)方法在最终的 Xcode 11 版本中不可用，但您可以通过同时应用cornerRadius&overlay修饰符来获得相同的结果：

Button(action: {}) {
    VStack {
        Image(systemName: "star.fill")
        Text("Hello world!")
    }
    .padding()
    .accentColor(Color(.systemRed))
    .background(Color(UIColor.systemRed.withAlphaComponent(0.4)))
    .cornerRadius(4.0)
    .overlay(
        RoundedRectangle(cornerRadius: 4).stroke(Color(.systemRed), lineWidth: 2)
    )
}

结果：