ios - viewWillAppear(_ :) viewDidDisappear(_:) View SwiftUI

Question

我想从 viewWillAppear(_:) 上获取数据
SwiftUI 中是否有任何相同的方法或修饰符可用？
还有 viewDidDisappear(_:) 的任何修饰符

Answer 1

当然有

@available(iOS 13.0, OSX 10.15, tvOS 13.0, watchOS 6.0, *)
extension View {

    /// Adds an action to perform when this view appears.
    ///
    /// - Parameter action: The action to perform. If `action` is `nil`, the
    ///   call has no effect.
    /// - Returns: A view that triggers `action` when this view appears.
    @inlinable public func onAppear(perform action: (() -> Void)? = nil) -> some View


    /// Adds an action to perform when this view disappears.
    ///
    /// - Parameter action: The action to perform. If `action` is `nil`, the
    ///   call has no effect.
    /// - Returns: A view that triggers `action` when this view disappears.
    @inlinable public func onDisappear(perform action: (() -> Void)? = nil) -> some View

}