如何知道swiftUI有没重新渲染？

2025-01-25

let _ = Self._printChanges

注意，需要运行才能在控制台看到是否渲染，预览时看不到信息。

import SwiftUI

struct CounterView: View {
    
    @State private var counter: Int = 0
    
    var body: some View {
        
        let _ = Self._printChanges()
        
        VStack {
            Text("\(counter)")
                .font(.largeTitle)
            
            Button("Increment") {
                counter += 1
            }
        }.frame(maxWidth: .infinity, maxHeight: .infinity)
    }
}