问题描述
UIViewRepresentable:
import SwiftUI
import MapKit
import CoreData
struct CustomView: UIViewRepresentable {
var coordinate: CLLocationCoordinate2D
func makeUIView(context: Context) -> MKMapView {
MKMapView(frame: .zero)
}
func updateUIView(_ uiView: MKMapView,context: Context) {
let span = MKCoordinateSpan(latitudeDelta: 0.01,longitudeDelta: 0.01)
let region = MKCoordinateRegion(center: coordinate,span: span)
uiView.setRegion(region,animated: true)
}
}
ContentView:
import SwiftUI
import CoreLocation
struct ContentView: View {
var body: some View {
GeometryReader { geo in
CustomView(coordinate: CLLocationCoordinate2D(latitude: 37.33182,longitude: -122.03118))
.frame(width: geo.size.width,height: 300)
.cornerRadius(25)
.contextMenu(/*@START_MENU_TOKEN@*/ContextMenu(menuItems: {
Text("Menu Item 1")
Text("Menu Item 2")
Text("Menu Item 3")
})/*@END_MENU_TOKEN@*/)
}
.padding(.horizontal)
.frame(height: 300)
}
}
上面的代码在SwiftUI Canvas和Simulator中可以正常工作,但是在我的物理测试设备(iPhone 7-iOS 14 Beta 5)上,当我长按CustomView时,它会变成黑色。该应用有时有时还会因以下可能的错误而崩溃:
CGImageCreate: invalid image alphaInfo: kCGImageAlphaNone. It should be kCGImageAlphaNoneskipLast
如果我将CustomView替换为下面的图像,则一切正常:
import SwiftUI
struct ContentView: View {
var body: some View {
Image("imageName")
.resizable()
.frame(width: 350,height: 300)
.cornerRadius(25)
.contextMenu(/*@START_MENU_TOKEN@*/ContextMenu(menuItems: {
Text("Menu Item 1")
Text("Menu Item 2")
Text("Menu Item 3")
})/*@END_MENU_TOKEN@*/)
}
}
我该如何解决?谢谢!
解决方法
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