小编Deg*_*sei的帖子

这是我的Codable类:

class SensorOutput: Codable {

    var timeStamp: Date?

    var gyroX: Double?
    var gyroY: Double?
    var gyroZ: Double?

    var accX: Double?
    var accY: Double?
    var accZ: Double?

    var magX: Double?
    var magY: Double?
    var magZ: Double?

    init() {}
}

在这里,我尝试编写并读取该类的对象以进行归档:

    let myData = SensorOutput()
    myData.timeStamp = Date()
    myData.gyroX = 0.0
    myData.gyroY = 0.0
    myData.gyroZ = 0.0
    myData.accX = 0.0
    myData.accY = 0.0
    myData.accZ = 0.0
    myData.magX = 0.0
    myData.magY = 0.0
    myData.magZ = 0.0

    NSKeyedArchiver.archiveRootObject(myData, toFile: filePath)

    if let Data = …

我想要得到我之后收到的东西

 pdfView.autoScales = true

无法改变比例。

在@carmine的帮助下，我们得到了：

import UIKit
import PDFKit

class ViewController: UIViewController {

@IBOutlet weak var pdfView: PDFView!

override func viewDidLoad() {
    super.viewDidLoad()

    setPdfFile()
}

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    self.pdfView.autoScales = true
}

func setPdfFile() {
    if let path = Bundle.main.path(forResource: "Swift.org - Getting Started", ofType: "pdf") {
        let url = URL(fileURLWithPath: path)
        if let pdfDocument = PDFDocument(url: url) {
            pdfView.autoScales = true
            pdfView.displayMode = .singlePageContinuous
            pdfView.displayDirection = .vertical
            pdfView.document …

如何在回调的闭包中将数据从 SwiftUI 视图发送到 UIKit ViewController？假设我们有 SwiftUI 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()
    }
}

还有 ViewController，里面有 SwiftUI 视图：

import UIKit
import SwiftUI

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup …

当我尝试使用pdfkit显示pdf文件时，应用程序崩溃。这是简单的示例？：

import UIKit
import PDFKit

class ViewController: UIViewController {

    @IBOutlet weak var pdfView: PDFView!

    override func viewDidLoad() {
        super.viewDidLoad()
        if let path = Bundle.main.path(forResource: "file", ofType: "pdf") {
            let url = URL(fileURLWithPath: path)
            if let pdfDocument = PDFDocument(url: url) {
                pdfView.displayMode = .singlePageContinuous
                pdfView.autoScales = true
                // pdfView.displayDirection = .horizontal
                pdfView.document = pdfDocument
            }
        }
    }
}

这会因“未捕获的异常'CALayerInvalidGeometry'而崩溃，原因：'CALayer位置包含NaN：[nan nan]'”：

2019-03-26 21:09:47.837837+0400 pdfKitTest[3163:93151] libMobileGestalt MobileGestalt.c:890: MGIsDeviceOneOfType is not supported on this platform.
2019-03-26 21:09:47.927078+0400 pdfKitTest[3163:93151] *** Terminating app due to uncaught …