> For the complete documentation index, see [llms.txt](https://lochiwei.gitbook.io/ios/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lochiwei.gitbook.io/ios/custom/control/slidersforsize.md).

# SlidersForSize

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

![](https://1830103165-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M5-JmwCZMKh_d7RfBaN%2Fuploads%2FbpvOvJMPEaluX76TzD4H%2FSlidersForSize.png?alt=media\&token=c53d54d4-9b08-4201-9c15-ae297609847d)

{% 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 %}