当我的代码从其他 swift 包中导入控件或值时,我在位于 Swift 包中的 View 中出现 SwiftUI 预览问题。
import Foundation
import SwiftUI
import Common
struct AppointmentListItem: View {
var appointment: Appointment
var body: some View {
VStack{
HStack(spacing: 10){
//Client Info
Image(self.appointment.client.profilePicture)
.resizable()
.aspectRatio(contentMode: .fill)
.frame(width: 35, height: 35)
.clipShape(Circle())
.shadow(radius: 10)
.overlay(Circle().stroke(Color.white, lineWidth: 1.5))
Text(self.appointment.client.fullName)
.font(.system(size: 18))
.bold()
.frame(maxWidth: .infinity, alignment: .leading)
Text(self.appointment.getHourAndMinutes()).bold()
//Detail info
Button(action: {
withAnimation{
print("Go to details")
}
}){
Image(systemName: "ellipsis")
.font(.system(size: 18))
.frame(width: 20, height: 20)
.rotationEffect(Angle.init(degrees: 90))
}
}
.padding()
}
.foregroundColor(Color.white)
.background(RoundedRectangle(cornerRadius: 20)
.fill(Color.hippoPrimary)// <- this color is part of Common package
)
}
}
如果我删除或更改 .fill(Color.hippoPrimary)
预览可用。Xcode提供的错误如下:
RemoteHumanReadableError: Failed to update preview.
The preview process appears to have crashed.
Error encountered when sending 'previewInstances' message to agent.
==================================
| RemoteHumanReadableError: The operation couldn’t be completed. (BSServiceConnectionErrorDomain error 3.)
|
| BSServiceConnectionErrorDomain (3):
| ==BSErrorCodeDescription: OperationFailed
这是我的 Package.swift 文件:// swift-tools-version:5.3
// The swift-tools-version declares the minimum version of Swift required to build this package.
import PackageDescription
let package = Package(
name: "TodayAppointments",
platforms: [
.iOS(.v13)
],
products: [
// Products define the executables and libraries a package produces, and make them visible to other packages.
.library(
name: "TodayAppointments",
targets: ["TodayAppointments"]),
],
dependencies: [
// Dependencies declare other packages that this package depends on.
// .package(url: /* package url */, from: "1.0.0"),
.package(path: "../Common")
],
targets: [
// Targets are the basic building blocks of a package. A target can define a module or a test suite.
// Targets can depend on other targets in this package, and on products in packages this package depends on.
.target(
name: "TodayAppointments",
dependencies: ["Common"]),
.testTarget(
name: "TodayAppointmentsTests",
dependencies: ["TodayAppointments"]),
]
)
在通用包中,颜色是这样定义的:public extension Color {
static let hippoPrimary = Color("Primary", bundle: .module)
static let progressBarBackground = Color("ProgressBarBackground", bundle: .module)
static let textBackground = Color("TextBackground", bundle: .module)
static let textColor = Color("TextColor", bundle: .module)
static let appleSignInBackground = Color("AppleSignInBackground", bundle: .module)
static let buttonActionText = Color("Text", bundle: .module)
}
构建没有错误,所以我知道依赖项没问题,听起来像一个 IDE。提前致谢。
最佳答案
iOS 和 macOS 的解决方法(未经 Catalyst 测试):
extension Foundation.Bundle {
static var swiftUIPreviewsCompatibleModule: Bundle {
final class CurrentBundleFinder {}
/* The name of your local package, prepended by "LocalPackages_" for iOS and "PackageName_" for macOS. You may have same PackageName and TargetName*/
let bundleNameIOS = "LocalPackages_TargetName"
let bundleNameMacOs = "PackageName_TargetName"
let candidates = [
/* Bundle should be present here when the package is linked into an App. */
Bundle.main.resourceURL,
/* Bundle should be present here when the package is linked into a framework. */
Bundle(for: CurrentBundleFinder.self).resourceURL,
/* For command-line tools. */
Bundle.main.bundleURL,
/* Bundle should be present here when running previews from a different package (this is the path to "…/Debug-iphonesimulator/"). */
Bundle(for: CurrentBundleFinder.self).resourceURL?.deletingLastPathComponent().deletingLastPathComponent().deletingLastPathComponent(),
Bundle(for: CurrentBundleFinder.self).resourceURL?.deletingLastPathComponent().deletingLastPathComponent(),
]
for candidate in candidates {
let bundlePathiOS = candidate?.appendingPathComponent(bundleNameIOS + ".bundle")
let bundlePathMacOS = candidate?.appendingPathComponent(bundleNameMacOs + ".bundle")
if let bundle = bundlePathiOS.flatMap(Bundle.init(url:)) {
return bundle
} else if let bundle = bundlePathMacOS.flatMap(Bundle.init(url:)) {
return bundle
}
}
fatalError("unable to find bundle")
}
}
然后替换对 Bundle.module
的调用与 Bundle.swiftUIPreviewsCompatibleModule
.
关于ios - Xcode 12 - 当有另一个 Swift 包作为依赖项时,SwiftUI 预览在 Swift 包上不起作用 - 'previewInstances' 给代理的消息,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/64540082/