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September 13, 2025
@ViewBuilder functions with conditional logic to avoid creating unnecessary views. Instead of embedding complex if-else chains directly in your view body, extract them into separate @ViewBuilder functions. This keeps your main view clean and allows SwiftUI to optimize rendering by only evaluating the active branch.This pattern separates complex conditional rendering logic into dedicated ViewBuilder computed properties, making the main view body cleaner and more readable while maintaining optimal performance.
struct ContentView: View {
@State private var userRole: UserRole = .guest
var body: some View {
VStack {
headerView
mainContent
}
}
@ViewBuilder
private var headerView: some View {
switch userRole {
case .admin:
AdminHeaderView()
case .member:
MemberHeaderView()
case .guest:
GuestHeaderView()
}
}
@ViewBuilder
private var mainContent: some View {
if userRole == .guest {
WelcomeView()
} else {
DashboardView(userRole: userRole)
}
}
}SwiftUI's diffing algorithm works more efficiently when conditional views are isolated in separate ViewBuilder functions. This approach reduces cognitive load, improves testability, and allows SwiftUI to better optimize view creation and updates by only evaluating the necessary branches.