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SwiftUIでpreview modeかどうかの判定方法

Last updated at Posted at 2020-07-21

SwiftUIでソースを書いてると、
サーバー通信ができないなどで右側のCanvas(Preview)が表示できなくなるときに
以下のif文が便利。

if ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1"{

実際はこんな感じで利用しました。↓

struct ContentView: View {
    var body: some View {
        Text("Hello, World!")
		
		.onAppear(){
			if ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] != "1"{
				//サーバー通信の処理
			}
		}
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

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