SwiftUI NavigationBar高度
SwiftUI NavigationBar高度
提问于 2020-02-15 17:56:44
如何获得当前的NavigationBar高度？在UIKit我们可以得到
navigationController?.navigationBar.frame.height但是找不到SwiftUI的任何东西..。
回答 3
Stack Overflow用户
回答已采纳
发布于 2020-02-17 09:08:55
基于这篇文章(感谢Asperi)：https://stackoverflow.com/a/59972635/12299030
struct NavBarAccessor: UIViewControllerRepresentable {
var callback: (UINavigationBar) -> Void
private let proxyController = ViewController()
func makeUIViewController(context: UIViewControllerRepresentableContext<NavBarAccessor>) ->
UIViewController {
proxyController.callback = callback
return proxyController
}
func updateUIViewController(_ uiViewController: UIViewController, context: UIViewControllerRepresentableContext<NavBarAccessor>) {
}
typealias UIViewControllerType = UIViewController
private class ViewController: UIViewController {
var callback: (UINavigationBar) -> Void = { _ in }
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let navBar = self.navigationController {
self.callback(navBar.navigationBar)
}
}
}
}然后我们可以从任何角度称之为：
.background(NavBarAccessor { navBar in
print(">> NavBar height: \(navBar.bounds.height)")
// !! use as needed, in calculations, @State, etc.
})Stack Overflow用户
发布于 2021-06-02 22:21:14
根据@yoprst的响应，而不是配置计算和@State变量，还可以返回一个View直接插入到层次结构中：
struct NavigationBarAccessor: UIViewControllerRepresentable {
var callback: (UINavigationBar) -> (AnyView)
private let proxyViewController = ProxyViewController()
func makeUIViewController(context: UIViewControllerRepresentableContext<NavigationBarAccessor>) -> UIViewController {
self.proxyViewController.callback = callback
return proxyViewController
}
func updateUIViewController(_ uiViewController: UIViewController, context: UIViewControllerRepresentableContext<NavigationBarAccessor>) {
}
private class ProxyViewController: UIViewController {
var callback: ((UINavigationBar) -> AnyView)?
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let navigationBar = self.navigationController?.navigationBar {
_ = self.callback?(navigationBar)
}
}
}
}用法：
VStack {
NavigationBarAccessor { navigationBar in
Spacer()
.frame(height: navigationBar.frame.height)
}
}Stack Overflow用户
发布于 2021-10-18 14:04:10
使用GeometryReader，如下所示：
ZStack {
GeometryReader { geometry in
Rectangle().fill(Color.blue).frame(height: geometry.safeAreaInsets.bottom + 44.0)
}
Text("Content")
}
.edgesIgnoringSafeArea(.top)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/60241552
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