你可以试试这个。至少对我有用。希望对别人有帮助：

TextField("", text: $textfieldValueBinding)
                .frame(height: 48)
                .padding(EdgeInsets(top: 0, leading: 6, bottom: 0, trailing: 6))
                .cornerRadius(5)
                .overlay(
                    RoundedRectangle(cornerRadius: 5)
                        .stroke(lineWidth: 1.0)
                )

你可以检查这个。现在我只做了顶部和底部填充。你可以做同样的前导和尾随（或与水平和垂直）。如在问题中所问，这将做这个***“我希望能够聚焦文本字段，即使用户点击填充。"***

struct ContentView: View {
@State var name = ""
@State var isTextFieldFocused = false
var body: some View {
        ZStack {
            HStack{
                Text(name)
                    .font(.system(size: 50 , weight: .black))
                    .foregroundColor(isTextFieldFocused ? Color.clear : Color.black)
                Spacer()
            }
            TextField(name, text: $name , onEditingChanged: { editingChanged in
                isTextFieldFocused = editingChanged
            }) 
            .font(.system(size: isTextFieldFocused ? 50 :  100 , weight: .black))
            .foregroundColor(isTextFieldFocused ? Color.black  : Color.clear)
            .frame(width: 300, height: isTextFieldFocused ? 50 :  100 , alignment: .center)
                        .padding(.leading, isTextFieldFocused ? 25 : 0  )
                        .padding(.trailing, isTextFieldFocused ? 25 : 0 )
            
            .padding(.top,isTextFieldFocused ? 25 : 0 )
            .padding(.bottom,isTextFieldFocused ? 25 : 0 )
            
        }.frame(width: 300)
        .background(Color.red.opacity(0.2))
}
}

可以，但您必须创建自己的TextFieldStyle。下面是一个示例：

struct CustomTextField: View {
    
    public struct CustomTextFieldStyle : TextFieldStyle {
        public func _body(configuration: TextField<Self._Label>) -> some View {
            configuration
                .font(.largeTitle) // set the inner Text Field Font
                .padding(10) // Set the inner Text Field Padding
                //Give it some style
                .background(
                    RoundedRectangle(cornerRadius: 5)
                        .strokeBorder(Color.primary.opacity(0.5), lineWidth: 3)) 
        }
    }
    @State private var password = ""
    @State private var username = ""
    
    var body: some View {
        VStack {
            TextField("Test", text: $username)
                .textFieldStyle(CustomTextFieldStyle()) // call the CustomTextField
            SecureField("Password", text: $password)
                .textFieldStyle(CustomTextFieldStyle())
        }.padding()
    }
}

在TextField周围添加HStack，然后就可以使用HStack了：示例：

VStack {

                ...
                
                
                HStack {
                        TextField("Social security number", text: $socialNumber)
                            .disableAutocorrection(true)
                }
                .padding()
                .padding(.leading, 30.0)
                .padding(.trailing, 30.0)
                .background(RoundedRectangle(cornerRadius: 12).fill(Theme.color.textFieldBackgroundColor))
                .frame(maxWidth: 315)
                
                ...
            }
            .padding(.top, 0)
            .frame(maxWidth: 350)

TextField(
    "TextFiled",
    text: $teamNames,
    prompt: Text("Text Field")
        .foregroundColor(.gray)
)
    .padding(5)
    .frame(width: 250, height: 50, alignment: .center)
    .background(
        RoundedRectangle(cornerRadius: 25, style: .continuous)
            .foregroundColor(.white)
            .padding(.horizontal, -30)
    )

我不知道是否可以在TextField内部给予，但可以从外部环境填充，并使用与TextField背景相同的颜色为其提供形状背景。
试试这个

TextField("Username", text: $value)
            .background(Color.yellow)
            .padding(50)
            .background(Capsule().fill(Color.white))