SwiftUI 问答之 将数据从 SwiftUI 传递到 UIKit 的回调
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实战需求
在Swift视图的回调关闭过程中如何实现数据传输至UikitViewController？假设我们有一个Swift视图：
import SwiftUI
struct MyView: View {
var buttonPressed: (() -> Void)?
@State var someData = ""
var body: some View {
ZStack {
Color.purple
Button(action: {
someData = "new Data"
self.buttonPressed?()
}) {
Text("Button")
}
}
}
}
struct MyView_Previews: PreviewProvider {
static var previews: some View {
MyView()
}
}
代码解读和 ViewController 在哪里，其中我们有 SwiftUI 视图：
import UIKit
import SwiftUI
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let swiftUIView = MyView()
let hostingViewController = UIHostingController(rootView: swiftUIView)
self.view.addSubview(hostingViewController.view)
hostingViewController.view.translatesAutoresizingMaskIntoConstraints = false
hostingViewController.view.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
hostingViewController.view.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
hostingViewController.view.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
hostingViewController.view.rightAnchor.constraint(equalTo: self.view.rightAnchor).isActive = true
hostingViewController.rootView.buttonPressed = {
print ("callback recived")
// i know i can try to get the data in this way, but if MyView become too complex than it won't look well
//print(hostingViewController.rootView.$someData)
}
}
}
代码解读如何通过闭包向 ViewController 发送一些数据？
解放方案
您可以通过参数传递它，例如
struct MyView: View {
var buttonPressed: ((String) -> Void)? // << here !!
@State var someData = ""
var body: some View {
ZStack {
Color.purple
Button(action: {
someData = "new Data"
self.buttonPressed?(someData) // << here !!
代码解读和
hostingViewController.rootView.buttonPressed = { value in // << here !!
print("callback received")
print(value)
}
代码解读加入我们一起学习SwiftUI
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