swiftui

问题 It easy to create a simple list like this: List { Text("Item 1") Text("Item 2") Text("Item3") } But how I can add a selection like traditional NSTable? 回答1: struct names { var id = 0 var name = "" } var demoData = ["Phil Swanson", "Karen Gibbons", "Grant Kilman", "Wanda Green"] struct SelectionDemo : View { @State var selectKeeper = Set<String>() var body: some View { HStack { List(demoData, id: \.self, selection: $selectKeeper){ name in Text(name) }.frame(width: 500, height: 460) } } } #if

问题 It easy to create a simple list like this: List { Text("Item 1") Text("Item 2") Text("Item3") } But how I can add a selection like traditional NSTable? 回答1: struct names { var id = 0 var name = "" } var demoData = ["Phil Swanson", "Karen Gibbons", "Grant Kilman", "Wanda Green"] struct SelectionDemo : View { @State var selectKeeper = Set<String>() var body: some View { HStack { List(demoData, id: \.self, selection: $selectKeeper){ name in Text(name) }.frame(width: 500, height: 460) } } } #if

问题 I found strange behavior in SwiftUI. The sheet shows empty text when I tap a list column first time. It seems correct after second time. Would you help me? import SwiftUI let fruits: [String] = [ "Apple", "Banana", "Orange", ] struct ContentView: View { @State var isShowintSheet = false @State var selected: String = "" var body: some View { NavigationView { List(fruits, id: \.self) { fruit in Button(action: { selected = fruit isShowintSheet = true }) { Text(fruit) } } } .sheet(isPresented:

问题 I found strange behavior in SwiftUI. The sheet shows empty text when I tap a list column first time. It seems correct after second time. Would you help me? import SwiftUI let fruits: [String] = [ "Apple", "Banana", "Orange", ] struct ContentView: View { @State var isShowintSheet = false @State var selected: String = "" var body: some View { NavigationView { List(fruits, id: \.self) { fruit in Button(action: { selected = fruit isShowintSheet = true }) { Text(fruit) } } } .sheet(isPresented:

问题 When I put an explicit animation inside a NavigationView, as an undesirable side effect, it animates the initial layout of the NavigationView content. It gets especially bad with infinite animations. Is there a way to disable this side effect? Example: the image below is supposed to be an animated red loader on a full screen blue background. Instead I get this infinite loop of a scaling blue background: import SwiftUI struct EscapingAnimationTest: View { var body: some View { NavigationView {

问题 I'm trying to adopt one of my old programs to new SwitUI. I could not find a way to draw the text on a graph. Below example is displaying two lines (in reality it will be some sort of oscilloscope showing real time voltage changes). To keep the story short. below fragment is drawing two lines and then I want to have some description "label" on it. Lines are drawn correctly but then cannot get any text. UIGraphics is not available on Mac OS applications. For last three days I'm googling a lot.

问题 I'm trying to adopt one of my old programs to new SwitUI. I could not find a way to draw the text on a graph. Below example is displaying two lines (in reality it will be some sort of oscilloscope showing real time voltage changes). To keep the story short. below fragment is drawing two lines and then I want to have some description "label" on it. Lines are drawn correctly but then cannot get any text. UIGraphics is not available on Mac OS applications. For last three days I'm googling a lot.

问题 I'm new to SwiftUI and I'm having problems with presenting Alerts back-to-back. The description of the .alert(item:content:) modifier has this written in it's definition: /// Presents an alert. /// /// - Parameters: /// - item: A `Binding` to an optional source of truth for the `Alert`. /// When representing a non-nil item, the system uses `content` to /// create an alert representation of the item. /// /// If the identity changes, the system will dismiss a /// currently-presented alert and

问题 I'm new to SwiftUI and I'm having problems with presenting Alerts back-to-back. The description of the .alert(item:content:) modifier has this written in it's definition: /// Presents an alert. /// /// - Parameters: /// - item: A `Binding` to an optional source of truth for the `Alert`. /// When representing a non-nil item, the system uses `content` to /// create an alert representation of the item. /// /// If the identity changes, the system will dismiss a /// currently-presented alert and

问题 Using SwiftUI how do I change the navigation bar's title size? Choosing between a standard or a large title. 回答1: SwiftUI (Xcode 11.3) SwiftUI navigationBarTitle modifier has an optional displayMode property which you can set to .inline for small titles and .large for large titles. See documentation NavigationView { TopLevelView { // […] } .navigationBarTitle("Test", displayMode: .inline) // ⬅️ Important part } How it's done in UIKit Since iOS 11, UINavigationBar can display its title in