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並前往https://medium.com/%E5%BD%BC%E5%BE%97%E6%BD%98%E7%9A%84-swift-ios-app-%E9%96%8B%E7%99%BC%E5%95%8F%E9%A1%8C%E8%A7%A3%E7%AD%94%E9%9B%86/swiftui-%E7%9A%84-viewbuilder-%E5%8F%AF%E4%BB%A5%E8%BC%B8%E5%85%A5-if-let-switch-%E4%BA%86-48601cac88ba

新版SwiftUI 的ViewBuilder 可以輸入if let，switch & 宣告變數常數

var imageName: String? var body: some View { VStack { Text(userName) if let imageName = imageName { Image(imageName) .

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