我是 Swift 编程的新手，我正在尝试通过一些 Youtube 教程学习如何构建我自己的聊天应用程序。我已经走了很远，但遇到了障碍。我不明白为什么当我尝试在 SwiftUI 中向上滚动此 View 时，消息会中途中断。我以为它与padding有关，但padding应该设置为all。查看下面的屏幕截图:
我不确定我的代码哪里做错了，因为一切似乎都正常。我的代码附在下面。任何帮助将不胜感激!
import SwiftUI
struct ChatUIView: View {
@State var message = ""
//StateObject is the owner of the object...
@StateObject var allMessages = Messages()
var body: some View {
VStack{
ZStack{
/*
HStack{
Spacer()
}*/
VStack(spacing:5){
Text("Chat")
.fontWeight(.bold)
}
.foregroundColor(.white)
}
.padding(.all)
//Spacer()
VStack{
//Spacer()
//Displaying Message...
ScrollView(.vertical, showsIndicators: false, content: {
ScrollViewReader{reader in
VStack(spacing: 20){
ForEach(allMessages.messages){msg in
//Chat Bubbles...
ChatBubble(msg: msg)
}
//whenever new data is inserted, scroll to bottom...
.onChange(of: allMessages.messages) {(value) in
//scrolling only user message...
if value.last!.myMsg{
reader.scrollTo(value.last?.id)
}
}
}
.padding([.horizontal, .bottom])
.padding(.top, 25)
}
})
HStack(spacing:15){
HStack(spacing: 15){
TextField("Message", text: self.$message)
}
.padding(.vertical, 12)
.padding(.horizontal)
.background(Color.black.opacity(0.06))
.clipShape(Capsule())
//send button
//hiding view...
if message != ""{
Button(action: {
//appending message...
//adding animation...
withAnimation(.easeIn){
allMessages.messages.append(Message(id: Date(), message: message, myMsg: false))
}
message = ""
}, label: {
Image("send")
.resizable()
.frame(width: 25, height: 25)
.rotationEffect(.init(degrees: 45))
.padding()
//.aspectRatio(contentMode: .fit)
//.font(.system(size: 0.5))
//.padding(.all)
.background(Color.black.opacity(0.07))
.clipShape(Circle())
})
}
}
.padding(.horizontal)
.animation(.easeOut)
}
.padding(.bottom, UIApplication.shared.windows.first?.safeAreaInsets.bottom)
.background(Color.white)
.clipShape(RoundedShape())
}
//.edgesIgnoringSafeArea(.bottom)
.background(Color.blue.edgesIgnoringSafeArea(.top))
}
}
//Chat Bubbles...
struct ChatBubble : View {
var msg : Message
var body: some View{
//Automatics scroll to bottom...
//First assigning id to each row
HStack(alignment: .top, spacing: 10){
if msg.myMsg{
//pushing msg to the left...
//minimum space ...
Spacer(minLength: 25)
Text(msg.message)
.padding(.all)
.background(Color.black.opacity(0.06))
//.cornerRadius(15)
.clipShape(BubbleArrow(myMsg: msg.myMsg))
} else {
//pushing msg to the right...
Text(msg.message)
.lineLimit(nil)
.foregroundColor(.white)
.padding(.all)
//.background(Color.black.opacity(0.06))
.background(Color.blue)
.clipShape(BubbleArrow(myMsg: msg.myMsg))
Spacer(minLength: 25)
}
}
.id(msg.id)
//.padding(msg.myMsg ? .leading : .trailing, 55)
//.padding(.vertical,10)
}
}
// Bubble Arrow...
struct BubbleArrow : Shape {
var myMsg : Bool
func path(in rect: CGRect) -> Path {
let path = UIBezierPath(roundedRect: rect, byRoundingCorners: myMsg ? [.topLeft, .bottomLeft, .bottomRight] : [.topRight, .bottomLeft, .bottomRight], cornerRadii: CGSize(width: 10, height: 10))
return Path(path.cgPath)
}
}
// Custom Rounded Shape...
struct RoundedShape : Shape {
func path(in rect: CGRect) -> Path {
let path = UIBezierPath(roundedRect: rect, byRoundingCorners: [.topLeft, .topRight], cornerRadii: CGSize(width: 35, height: 35))
return Path(path.cgPath)
}
}
// Model Data For Message...
struct Message : Identifiable, Equatable {
var id: Date
var message: String
var myMsg: Bool
//var profilePic: String
//var photo: Data?
}
class Messages: ObservableObject {
@Published var messages : [Message] = []
//sample data...
init() {
let strings = ["Hi!", "hello!", "How are you doing?!", "Fine, I just want to talk about life", "ok, I may be able to help with that", "This is awesome, thanks", "So what do you want to talk about?", "movies sound like a good topic. Let's start there!", "Ok, so tell me: What's you favorite movie?", "Definitely, interstellar for sure."]
for i in 0..<strings.count{
//simple logic for two sided message View...
messages.append(Message(id: Date(), message: strings[i], myMsg: i % 2 == 0 ? false : true))
}
}
func writeMessage(id: Date, msg: String, photo: Data?, myMsg: Bool){
messages.append((Message(id: id, message: msg, myMsg: myMsg)))
}
}
最佳答案
问题是在包含 ScrollView、TextField 和 Button 的 VStack 上使用 .clipShape(RoundedShape())。如果您注意到，不仅消息被减半，而且没有其他消息(还有一条)显示通过。自定义形状 RoundedShape 不够大，无法包含所有 View 。当我将其切换为内置形状矩形时，一切都会显示出来。我在 View 层次结构中看不到原因，但这就是问题所在。我会把它留给其他人来确定它发生了什么。
当您尝试调试 View 层次结构时，请从您的修饰符开始。将它们注释掉，直到发生变化，然后从那里开始探索。此外，修饰符的顺序很重要，因为在 View 上使用修饰符会给你一个全新的 View 。尝试一些简单的操作，比如将 .padding 放在 Text 上的 .font 之前，你会得到一个错误。这是因为填充 View 没有修改字体，即使修改后的 View 确实有字体。
关于ios - SwiftUI TextField 减半，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/65371684/