参数SwiftUI中的可选绑定
这是我的可选绑定参数SwiftUI中的可选绑定,swiftui,Swiftui,这是我的可选绑定 @Binding var showSheetModifFile : Bool? @Binding var fileToModify : File? init( showSheetModifFile : Binding<Bool?>? = nil, fileToModify : Binding<File?>? = nil) { _showSheetModifFile = showSheetModifFile ?? Binding.constant
@Binding var showSheetModifFile : Bool?
@Binding var fileToModify : File?
init( showSheetModifFile : Binding<Bool?>? = nil, fileToModify : Binding<File?>? = nil) {
_showSheetModifFile = showSheetModifFile ?? Binding.constant(nil)
_fileToModify = fileToModify ?? Binding.constant(nil)
}
我得到了这个错误:
“绑定”不能转换为“绑定”
有专门的绑定构造函数用于此目的
SingleFileView(showSheetModifFile: Binding(self.$showModifFileSheet),
fileToModify: Binding(self.$fileToModify))
更新:替代解决方案
struct FileDemoView: View {
@State var showModifFileSheet : Bool? = false
@State var fileToModify : File? = File()
var body: some View {
SingleFileView(showSheetModifFile: $showModifFileSheet, fileToModify: $fileToModify)
}
}
struct SingleFileView: View {
@Binding var showSheetModifFile : Bool?
@Binding var fileToModify : File?
init(showSheetModifFile : Binding<Bool?> = .constant(nil), fileToModify : Binding<File?> = .constant(nil)) {
_showSheetModifFile = showSheetModifFile
_fileToModify = fileToModify
}
var body: some View {
Text("")
}
}
struct FileDemoView:View{
@状态变量showModifileSheet:Bool?=false
@状态变量fileToModify:File?=File()
var body:一些观点{
单一文件视图(ShowSheetModifile:$ShowModifileSheet,fileToModify:$fileToModify)
}
}
结构单文件视图:视图{
@绑定var ShowSheetModifile:Bool?
@绑定var fileToModify:File?
init(showsheetmodifile:Binding=.constant(nil),fileToModify:Binding=.constant(nil)){
_ShowSheetModifile=ShowSheetModifile
_fileToModify=fileToModify
}
var body:一些观点{
正文(“”)
}
}
这个问题类似:是的,但接受的答案没有显示如何调用构造函数。我仍然有错误:无法将“Binding”类型的值转换为预期的参数类型“Binding?”@SofianeLyno您的init是否正在进行绑定?
可能?
struct FileDemoView: View {
@State var showModifFileSheet : Bool? = false
@State var fileToModify : File? = File()
var body: some View {
SingleFileView(showSheetModifFile: $showModifFileSheet, fileToModify: $fileToModify)
}
}
struct SingleFileView: View {
@Binding var showSheetModifFile : Bool?
@Binding var fileToModify : File?
init(showSheetModifFile : Binding<Bool?> = .constant(nil), fileToModify : Binding<File?> = .constant(nil)) {
_showSheetModifFile = showSheetModifFile
_fileToModify = fileToModify
}
var body: some View {
Text("")
}
}