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https://github.com/johnsusek/FlowStack

A grid layout view for SwiftUI
https://github.com/johnsusek/FlowStack

Last synced: 3 months ago
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A grid layout view for SwiftUI

Host: GitHub
URL: https://github.com/johnsusek/FlowStack
Owner: johnsusek
Created: 2019-06-26T02:52:19.000Z (over 5 years ago)
Default Branch: master
Last Pushed: 2020-07-22T21:26:24.000Z (over 4 years ago)
Last Synced: 2024-07-18T22:13:15.917Z (4 months ago)
Language: Swift
Size: 10.7 KB
Stars: 151
Watchers: 5
Forks: 8
Open Issues: 4
Metadata Files:
- Readme: README.md

Awesome Lists containing this project

fucking-about-SwiftUI - FlowStack
awesome-swiftui-libraries - FlowStack - A grid layout view for SwiftUI (Grid / Content)
awesome-swiftui - FlowStack is a grid layout component

README

        ## Update July 2020 - latest SwiftUI now has built-in components to do this, which should be used instead. 

# FlowStack

FlowStack is a SwiftUI component for laying out content in a grid.

## Requirements

Xcode 11 beta on MacOS 10.14 or 10.15

## Installation

In Xcode, choose File -> Swift Packages -> Add Package Dependency and enter [this repo's URL](https://github.com/johnsusek/FlowStack).

## Usage 

### FlowStack(*columns*, *numItems*, *alignment*) { *index*, *colWidth* in }



  columns (Int) 

  The number of columns to display.

  numItems (Int) 

  The total count of items you will be displaying.

  alignment (HorizontalAlignment?) 

  Default: .leading
The alignment of any trailing columns in the last row.



#### Callback parameters



  index (Int) 

  The index of the item currently being processed.

  colWidth (CGFloat) 

  The computed width of the column currently being processed.



## Examples

### 1) Simple

The simplest possible example:

```swift

FlowStack(columns: 3, numItems: 27, alignment: .leading) { index, colWidth in

  Text(" \(index) ").frame(width: colWidth)

}

```

You should always add `.frame(width: colWidth)` to the immediate child of `FlowStack`.

![Screen Shot 2019-06-25 at 10 43 41 PM](https://user-images.githubusercontent.com/611996/60149560-b7727480-979a-11e9-8759-cc9ec2eea01b.png)

### 2) Displaying Data

```swift

struct Item {

  var image: String

  var label: String

}

let items = [

  Item(image: "hand.thumbsup", label: "Up"),

  Item(image: "tortoise", label: "Tortoise"),

  Item(image: "forward", label: "Forward"),

  Item(image: "hand.thumbsdown", label: "Down"),

  Item(image: "hare", label: "Hare"),

  Item(image: "backward", label: "Backward")

]

FlowStack(columns: 3, numItems: items.count, alignment: .leading) { index, colWidth in

  Button(action: { print("Tap \(index)!") }) {

    Image(systemName: items[index].image)

    Text(items[index].label).font(Font.caption)

  }

  .padding()

  .frame(width: colWidth)

}

```

![Screen Shot 2019-06-25 at 10 54 25 PM](https://user-images.githubusercontent.com/611996/60149936-34521e00-979c-11e9-91c9-04e2f59c77b8.png)

### Padding/Borders/Actions

Let's draw a border on our cells to visualize some concepts:

```swift

FlowStack(columns: 3, numItems: 27, alignment: .leading) { index, colWidth in

  Text(" \(index) ").frame(width: colWidth).border(Color.gray)

}

```

![Screen Shot 2019-06-25 at 11 03 05 PM](https://user-images.githubusercontent.com/611996/60150233-69ab3b80-979d-11e9-96e6-b8795adff041.png)

Now let's swap the `.frame` and `.border` order and note what happens. This demonstrates the **order of operations is important when chaining layout modifiers**.

```swift

FlowStack(columns: 3, numItems: 27, alignment: .leading) { index, colWidth in

  Text(" \(index) ").border(Color.gray).frame(width: colWidth)

}

```

![Screen Shot 2019-06-25 at 11 04 58 PM](https://user-images.githubusercontent.com/611996/60150297-abd47d00-979d-11e9-8e09-892a11916c7f.png)

Now let's swap the order back and add some padding:

```swift

FlowStack(columns: 3, numItems: 27, alignment: .leading) { index, colWidth in

  Text(" \(index) ").padding().frame(width: colWidth).border(Color.gray)

}

```

![Screen Shot 2019-06-25 at 11 10 10 PM](https://user-images.githubusercontent.com/611996/60150446-69f80680-979e-11e9-95a9-ff18dc67ab17.png)

To add actions, you can of course **just put buttons in your cells** like example #2. But there is also a way to detect a tap on the entire cell. Note we add a background to detect taps in the empty areas outside the text.

```swift

FlowStack(columns: 3, numItems: 27, alignment: .leading) { index, colWidth in

  Text(" \(index) ")

    .padding()

    .frame(width: colWidth)

    .border(Color.gray)

    .background(Color.white)

    .tapAction {

      print("Tap!")

    }

}

```

### Example with images

Here's an example with images. LoadableImageView is from [here](https://github.com/schmidyy/SwiftUI-ListFetching/blob/23c1d5d4b506236e0a7a34a2aa5f991edd4091f4/Views.swift). 

```swift

FlowStack(columns: 3, numItems: 27, alignment: .leading) { index, colWidth in

  VStack {

    LoadableImageView(with: "https://cataas.com/cat?type=sq?foo")

      .padding()

      .frame(width: colWidth, height: colWidth)

      .tapAction { print("Meow!") }

    Text(" \(index) ")

  }

  .padding()

  .frame(width: colWidth)

  .border(Color.gray)

  .background(Color.white)

  .tapAction {

    print("Tap!")

  }

}

```

![Screen Shot 2019-06-25 at 11 41 18 PM](https://user-images.githubusercontent.com/611996/60151555-c78e5200-97a2-11e9-94de-0a4ccc768629.png)

### Evenly spaced grid

```swift

FlowStack(columns: 4, numItems: 27, alignment: .leading) { index, colWidth in

  LoadableImageView(with: "https://cataas.com/cat?type=sq?rando")

    .padding(5)

    .frame(width: colWidth, height: colWidth)

}.padding(5)

```

![Screen Shot 2019-06-26 at 12 13 21 AM](https://user-images.githubusercontent.com/611996/60152721-3ff71200-97a7-11e9-91b2-b338edaab58c.png)

## Feedback

Please file a github issue if you're having trouble or spot a bug.