有没有办法(暂时)禁用自动布局错误/警告消息:
Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x170098420 H:[UIView:0x15c62c100(2)]>",
"<NSLayoutConstraint:0x170098600 UIView:0x15c6294f0.leading == UIView:0x15c628d40.leadingMargin - 8>",
"<NSLayoutConstraint:0x170098650 …环境： Xcode Version 12.3 (12C33)
Version 12.3 (12C33)
我注意到NavigationTitle在更新到 Xcode 12.3 RC 后会破坏自动布局。
这是一个简单的示例（根据注释修改为现代语法）：
import SwiftUI
struct ContentView: View {
var body: some View {
NavigationView {
VStack(alignment: .center, spacing: 10) {
Text("Hello, world!")
.padding()
}.navigationTitle(Text("Greetings World!"))
.navigationBarTitleDisplayMode(.inline)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
这是我在运行时得到的：
2020-12-09 11:42:19.994389-0800 UICheck[26092:799713] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you …我正在玩弄 SwiftUI 中的图像显示，并决定附加警报以在找不到图像时激活。
以下是缩略代码：
struct ContentView: View {
...
@State var image: URLImage = URLImage()
...
@State var showActionSheet = true
var body: some View {
ZStack {
Color.green
NavigationView {
VStack {
Button(action: {
self.url = "https://xxxx.org/\(Int.random(in: 0 ..< 10)).png"
self.image.imageLoader.load(url: URL(string: self.url)!)
}) {
Text("Get Random Image")
}
image.actionSheet(isPresented: $showActionSheet) {
ActionSheet(title: Text("Action Time"), message: Text("Greetings Ric!"), buttons:
[.default(Text("First Button"), action: {
print("First Button")
})])
}
}.navigationBarTitle(Text("Ric's Images"))
}
}
}
}
当我将“showAlertSheet”标志设置为“true”时，我会收到警报，但也会收到编译器的约束投诉：
2019-11-25 12:41:21.628064-0800 GetImages[32413:1078621] …
我正在尝试将此问题的已接受答案中的代码应用于如何使 SwiftUI TextField 成为第一响应者。这是从该答案复制的代码，我尝试在 xcode 中使用它：
struct CustomTextField: UIViewRepresentable {
class Coordinator: NSObject, UITextFieldDelegate {
@Binding var text: String
var didBecomeFirstResponder = false
init(text: Binding<String>) {
_text = text
}
func textFieldDidChangeSelection(_ textField: UITextField) {
text = textField.text ?? ""
}
}
@Binding var text: String
var isFirstResponder: Bool = false
func makeUIView(context: UIViewRepresentableContext<CustomTextField>) -> UITextField {
let textField = UITextField(frame: .zero)
textField.delegate = context.coordinator
return textField
}
func makeCoordinator() -> CustomTextField.Coordinator {
return Coordinator(text: $text)
}
func …我试图隐藏后退按钮名称，解决方案是这两行：
.navigationBarHidden(true)
.navigationBarTitle("")
一切工作正常，除了这个长控制台警告，这使得调试非常困难，因为我需要滚动或过滤很多才能看到所需的输出。
这条线导致了它：.navigationBarTitle("")
任何想法如何解决这一问题？
警告：
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<NSLayoutConstraint:0x600003823de0 'BIB_Trailing_CB_Leading' H:[_UIModernBarButton:0x11fe70c30]-(6)-[_UIModernBarButton:0x11fe6f370' '] (active)>",
"<NSLayoutConstraint:0x600003823e30 'CB_Trailing_Trailing' _UIModernBarButton:0x11fe6f370' '.trailing <= _UIButtonBarButton:0x11fe6eda0.trailing (active)>",
"<NSLayoutConstraint:0x600003850aa0 'UINav_static_button_horiz_position' _UIModernBarButton:0x11fe70c30.leading == UILayoutGuide:0x600002251500'UIViewLayoutMarginsGuide'.leading (active)>",
"<NSLayoutConstraint:0x600003850af0 'UINavItemContentGuide-leading' H:[_UIButtonBarButton:0x11fe6eda0]-(0)-[UILayoutGuide:0x600002251420'UINavigationBarItemContentLayoutGuide'] (active)>",
"<NSLayoutConstraint:0x60000383b7a0 'UINavItemContentGuide-trailing' UILayoutGuide:0x600002251420'UINavigationBarItemContentLayoutGuide'.trailing …我在 SwiftUI/Combine 应用程序中使用 Firebase，并且注意到一些警告，我想对其进行故障排除。他们没有破坏事情，但我想解决它们。我使用带有最新 Swift 包依赖项的 Xcode 12.4 时收到这些警告：GoogleUtilities 7.2.2 和 Firebase 7.7.0。
这是控制台中出现的第一个警告：
[GoogleUtilities/AppDelegateSwizzler][I-SWZ001014] App Delegate does not conform to UIApplicationDelegate protocol.
作为参考，这是我配置 Firebase 的方式：
import SwiftUI
import Firebase
@main
struct MyApp: App {
@StateObject var authState = AuthState()
init() {
FirebaseApp.configure()
}
var body: some Scene {
WindowGroup {
RootView()
.environmentObject(authState)
}
}
}
这是第二个警告，在我使用修饰符设置导航栏标题后出现.navigationBarTitle。
[LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't …