How to create custom modifiers
Fully updated for Xcode 11.5
If you find yourself constantly attaching the same set of modifiers to a view – e.g., giving it a background color, some padding, a specific font, and so on – then you can avoid duplication by creating a custom view modifier that encapsulates all those changes. So, rather than say “make it red, make it use a large font” and so on, you can just say “make it look like a warning,” and apply a pre-made set of modifiers.
If you want to make your own, define a struct that conforms to the ViewModifier protocol. This protocol requires that you accept a body(content:) method that transforms some sort of content however you want, returning the result.
For example, this creates a new PrimaryLabel modifier that adds padding, a red background, white text, and a large font:
struct PrimaryLabel: ViewModifier {
func body(content: Content) -> some View {
content
.padding()
.background(Color.red)
.foregroundColor(Color.white)
.font(.largeTitle)
}
}To use that in one of your views add the .modifier(PrimaryLabel()) modifier, like this:
struct ContentView: View {
var body: some View {
Text("Hello, SwiftUI")
.modifier(PrimaryLabel())
}
}
SPONSORED Are you tired of wasting time debugging your Swift app? Instabug’s SDK is here to help you minimize debugging time by providing you with complete device details, network logs, and reproduction steps with every bug report. All data is attached automatically, and it only takes a line of code to setup. Start your free trial now and get 3 months off exclusively for the Hacking with Swift Community.
Sponsor Hacking with Swift and reach the world's largest Swift community!
Similar solutions…
