# SlidersForSize

[swift](/ios/swift.md)⟩ [custom](/ios/custom.md) ⟩ control ⟩ SliderForSize 

![](/files/dZTunVxKj0X9gY0sJDGa)

{% tabs %}
{% tab title="👔 SlidersForSize" %}

````swift
// 2022.02.15 (*)
// 2022.02.17 (+) struct: SliderWithSubtitle
//            (f) bug   : step can be < 1

import SwiftUI

// ┌──────────────────────┐
// │    SlidersForSize    │
// └──────────────────────┘

/// 🎛 sliders to control width/height
/// ```
/// SlidersForSize($size)
/// ```
struct SlidersForSize: View {
    
    // ⭐️ Binding variable
    @Binding var size: CGSize
    
    var body: some View {
        VStack(spacing: 20) {
            // 🎛 Slider: control offered width
            SliderWithSubtitle(
                value   : $size.width, 
                subtitle: "width"
            )
            // 🎛 Slider: control offered height
            SliderWithSubtitle(
                value   : $size.height, 
                range   : 100...300,
                subtitle: "height", 
                tint    : .blue
            )
        }
    }
}

// convenience init
extension SlidersForSize {
    /// convenience init.
    /// ```
    /// SlidersForSize($size)
    /// ```
    init(_ size: Binding<CGSize>) {
        // ⭐️ 注意：不是 `self.size = size` ❗️❗️❗️
        self._size = size
    }
}

// ┌────────────────┐
// │    Previews    │
// └────────────────┘

struct SlidersForSize_Previews: PreviewProvider {
    static var previews: some View {
        SlidersForSize(size: .constant(.init(300,200)))
    }
}
````

{% endtab %}

{% tab title="👔 SliderWithSubtitle" %}

````swift
// 2022.02.17 (+) struct: SliderWithSubtitle

import SwiftUI

// ┌──────────────────────────┐
// │    SliderWithSubtitle    │
// └──────────────────────────┘

/// slider with subtitle below it.
/// ```
/// SliderWithSubtitle(
///    value   : $size.width, 
///    subtitle: "width"
/// )
/// 
/// // with all parameters
/// SliderWithSubtitle(
///    value   : $size.height, 
///    range   : 100...300,
///    subtitle: "height", 
///    tint    : .blue
/// )
struct SliderWithSubtitle: View {
    
    // ⭐️ Binding variable
    @Binding var value: CGFloat
    var range: ClosedRange<CGFloat> = 20...500
    var step: CGFloat = 1
    let subtitle: String
    var decimalPlaces = 0
    var tint: Color = .pink
    
    var body: some View {
        VStack {
            // 🎛 `Slider` to control the `value`
            Slider(value: $value, in: range, step: step)
                .tint(tint)
            // subtitle for slider
            Text("\(subtitle): \(value.decimalPlaces(decimalPlaces))")
                .font(.system(.caption, design: .monospaced))
                .foregroundColor(.secondary)
        }
    }
}
````

{% endtab %}

{% tab title="👥 相關" %}

* uses [＠Binding](/ios/swiftui/view/state/binding/binding.md) variable.
* uses [Slider](/ios/swiftui/control/slider.md)s.
  {% endtab %}

{% tab title="⬇️ 應用" %}

* used in [MyGrid](/ios/swiftui/view/layout/grids/examples/mygrid.md).
* used in demo view showing the [problem with .readSize()](/ios/swiftui/view/layout/grids/examples/problem-with-.readsize.md).
  {% endtab %}
  {% endtabs %}

## History

{% tabs %}
{% tab title="✏️" %}

1. 2022.02.17
   {% endtab %}

{% tab title="1" %}

````swift
// 2022.02.15

import SwiftUI

/// 🎛 sliders to control width/height
struct SlidersForSize: View {
    
    // ⭐️ Binding variable
    @Binding var size: CGSize
    
    var body: some View {
        VStack(spacing: 20) {
            // 🎛 `Slider` to control the offered width
            Slider(value: $size.width, in: 20...500, step: 1)
            // label for offered width
            Text("offered width: \(Int(size.width))")
                .font(.system(.caption, design: .monospaced))
                .foregroundColor(.secondary)
            // 🎛 `Slider` to control the offered width
            Slider(value: $size.height, in: 20...500, step: 1)
                .tint(.blue)
            // label for offered width
            Text("offered height: \(Int(size.height))")
                .font(.system(.caption, design: .monospaced))
                .foregroundColor(.secondary)
        }
        .frame(width: 300)
        .padding()
    }
}

extension SlidersForSize {
    /// convenience init.
    /// ```
    /// SlidersForSize($size)
    /// ```
    init(_ size: Binding<CGSize>) {
        // ⭐️ 注意：不是 `self.size = size` ❗️❗️❗️
        self._size = size
    }
}

struct SlidersForSize_Previews: PreviewProvider {
    static var previews: some View {
        SlidersForSize(size: .constant(.init(300,200)))
    }
}
````

{% endtab %}
{% endtabs %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://lochiwei.gitbook.io/ios/custom/control/slidersforsize.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.