LazyGrid - SwiftUI Blog

In SwiftUI we have two powerful and efficient grids to display multiple items:

LazyVGrid
LazyHGrid

The fundamental element for these types of grids is the GridItem, which can be of three types:

.adaptive
.fixed
.flexible

GridItem Adaptive

GridItem Adaptive is essential for a responsive layout. By setting a minimum size for it, the grid will try to adapt to all the available space.

Take a look at using LazyHGrid:

struct ContentView: View {
    let rainbowColors = [Color.red, Color.orange, Color.yellow, Color.green, Color.mint, Color.teal, Color.cyan, Color.blue, Color.indigo, Color.purple, Color.brown]
    var body: some View {
        ScrollView(.horizontal) {
            LazyHGrid(rows: [GridItem(.adaptive(minimum:150))]) {
                        ForEach(rainbowColors, id:\.self) { color in
                            Circle()
                            .fill(color)
                        }
                    }
                    .padding()
                }
    }
}

We can also define different sizes for the rows:

ScrollView(.horizontal) {
            LazyHGrid(rows: [GridItem(.adaptive(minimum:150)),GridItem(.adaptive(minimum:100))]) {
                        ForEach(rainbowColors, id:\.self) { color in
                            Circle().fill(color)
                        }
                    }
                    .padding()
                }

So we have:

So, the two different dimensions are used to adapt to the screen.

This type is helpful when we have a dynamic number of elements, such as in a playlist.

Using the Vertical grid:

ScrollView() {
            LazyVGrid(columns: [GridItem(.adaptive(minimum:100)), GridItem(.adaptive(minimum:50)),GridItem(.adaptive(minimum:100))]) {
                        ForEach(rainbowColors, id:\.self) { color in
                            Circle()
                            .fill(color)
                        }
                    }
                    .padding()
                }
}

GridItem Fixed

In this case, the GridItem has a fixed size for the horizontal layout:

ScrollView(.horizontal) {
            LazyHGrid(rows: [GridItem(.fixed(100))]) {
                ForEach(rainbowColors, id:\.self) { color in
                    Circle()
                                            .fill(color)
                }
            }
            .padding()
        }

For vertical:

ScrollView() {
            LazyVGrid(columns: [GridItem(.fixed(100))]) {
                    ForEach(rainbowColors, id:\.self) { color in
                        Circle()
                        .fill(color)
                    }
                }
                .padding()
            }
}

This is helpful when you need a fixed number of columns or rows. In this case, by adding GridItem with a fixed size, we don’t have adaptability to the screen.

Take a look at this example:

ScrollView() {
            LazyVGrid(columns: [GridItem(.fixed(150)),GridItem(.fixed(150)),GridItem(.fixed(150))]) {
                    ForEach(rainbowColors, id:\.self) { color in
                        Circle()
                        .fill(color)
                    }
                }
                .padding()
            }

We have:

Three columns of circles with fixed size but truncated.

GridItem Flexible

With flexible, we define the size of GridItem within a range. For example:

ScrollView(.horizontal) {
            LazyHGrid(rows: [GridItem(.flexible(minimum: 10, maximum: 50)),GridItem(.flexible(minimum: 20, maximum: 100))]) {
                ForEach(rainbowColors, id:\.self) { color in
                    Circle()
                    .fill(color)
                }
            }
            .padding()
        }

To have:

It’s helpful when we need different sizes for different content, such as images and text.