英文:
How to bridge from Binding<Float> to Binding<String> using an Extension in SwiftUI?
问题
以下是您要翻译的内容：
Context
我有一个将Binding限制为Float的Extension，将其转换为String以在SwiftUI的TextField中使用。然而，在无法确定导致问题的原因时，我遇到了两种奇怪的行为：
-
当输入超过4位数时，例如12345，
TextField会清空。 -
当输入小数分隔符（例如美国的"."）时，
TextField会清空。
Code
public extension Binding where Value == Float {
var adapter: Binding<String> {
Binding<String>(
get: {
guard self.wrappedValue != -1 else { return "" }
let formatter = NumberFormatter()
formatter.locale = Locale.current
formatter.numberStyle = .decimal
return formatter.string(from: NSNumber(value: self.wrappedValue)) ?? ""
},
set: {
let formatter = NumberFormatter()
formatter.locale = Locale.current
formatter.numberStyle = .decimal
self.wrappedValue = formatter.number(from: $0)?.floatValue ?? -1
}
)
}
}
如果您需要进一步的帮助，请随时提问。
英文:
Context
I have an Extension of Binding limited to Float which converts it into a String for usage with the SwiftUI TextField. However, I encountered two odd behaviours while not being able to identify the causing issues:
-
When entering more than 4 digits, e.g. 12345, the
TextFieldempties -
When entering a decimal separator (e.g. "." in the US), the
TextFieldempties
Code
public extension Binding where Value == Float {
var adapter: Binding<String> {
Binding<String>(
get: {
guard self.wrappedValue != -1 else { return "" }
let formatter = NumberFormatter()
formatter.locale = Locale.current
formatter.numberStyle = .decimal
return formatter.string(from: NSNumber(value: self.wrappedValue)) ?? ""
},
set: {
let formatter = NumberFormatter()
formatter.locale = Locale.current
formatter.numberStyle = .decimal
self.wrappedValue = formatter.number(from: $0)?.floatValue ?? -1
}
)
}
}
Question
- What causes these errors and how can I achieve my goal of bridging from
Binding<Float>toBinding<String>?
答案1
得分: 1
不要重新发明轮子，而是使用新的格式化样式
@State private var value: Float = 0
var body: some View {
//...
TextField("值", value: $value, format: .number)
//...
}
英文:
Don't reinvent the wheel, instead use the new formatting style
@State private var value: Float = 0
var body: some View {
//...
TextField("Value", value: $value, format: .number)
//...
}
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