ViewModifier

Published Dec 9, 2022Updated Mar 2, 2023

A ViewModifier is a protocol that can be called on a particular view. Modifier methods adhere to the protocol and return a new, altered View that will replace the originally created View.

Syntax

struct MyView: View {
    var body: some View {
        View(s) here
            Modifier methods like .bold() can be called underneath a View.
            Multiple modifiers can be chained using dot notation.
    }
}

Example

The following example displays some text:

import SwiftUI

struct ContentView: View {
    var name: String = "Sam"

    var body: some View {
        Text("Hello \(name)")
            .font(.title)
            .bold()
    }
}

In the example above, the .font() and .bold() modifiers are called on a Text view. In addition, a built-in text style, .title property, is passed into the .font() modifier.

This will display:

SwiftUI Modifier

ViewModifier

.animation(): Applies an animation to a view.
.background(): Applies a background to a view, which can be customized depending on the provided parameters.
.baselineOffset(): Moves text up or down relative to its baseline.
.bold(): Applies a bold style to text characters in a View.
.border(): Applies a border to a view, which can be customized with a specified style and width.
.font(): Applies a specified font to text in a view.
.fontWeight(): Sets the font weight of the text in Text view.
.foregroundColor(): Sets the foreground color that is displayed in a view.
.frame(): Applies an invisible frame around the view with the specified sizes.
.italic(): Indicates that the font inside a view should have an italic style applied to it.
.kerning(): Adjusts the spacing size between text characters in a view.
.keyboardType(): Specifies the keyboard type to use for text entry.
.overlay(): Layers the specified views in front of another view.
.padding(): Applies spacing around a view.
.resizable(): Configures an image in a View to resize itself to fit the surrounding space of its parent container.
.scaledToFill(): Scales the view to fill its parent view while maintaining the original aspect ratio.
.scaledToFit(): Scales the view to fit its parent view while maintaining the original aspect ratio.
.strikethrough(): Applies a horizontal line through the middle of the text in a string.
.textFieldStyle(): Applies a specified style to a text field.
.tracking(): Adjusts the spacing of the characters in a Text view.
.underline(): Applies an underline style to text characters in a view.