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How to Make Blink Effect In Swiftui?

4 minutes read

In SwiftUI, you can create a blink effect using the opacity modifier along with Animation to toggle between two opacity values. By continuously toggling the opacity values, you can create a blinking effect. Here's an example code snippet to achieve a blink effect:

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@State private var isBlinking = false

var body: some View {
    Text("Blinking Text")
        .opacity(isBlinking ? 1 : 0)
        .animation(Animation.easeInOut(duration: 0.5).repeatForever())
        .onAppear {
            self.isBlinking.toggle()
        }
}


In this example, the opacity of the text view is toggled between 0 and 1 based on the isBlinking state variable. An animation is applied with a duration of 0.5 seconds and set to repeat forever. When the view appears, the isBlinking state is toggled, starting the blinking effect.


What is the simplest way to create an animated blink effect in SwiftUI?

One way to create a simple blink effect in SwiftUI is to use the scaleEffect modifier to alternate between two different scales, creating a blink effect. Here's an example of how you can achieve this:

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struct BlinkingView: View {
    @State private var isBlinking = false

    var body: some View {
        Circle()
            .frame(width: 50, height: 50)
            .scaleEffect(isBlinking ? 1.5 : 1.0)
            .animation(Animation.easeInOut(duration: 0.5).repeatForever())
            .onAppear {
                self.isBlinking = true
            }
    }
}


In this example, a Circle view is created with a fixed width and height. The scaleEffect modifier is used to animate the scale of the circle, alternating between 1.5 and 1.0 based on the value of the isBlinking state variable. The Animation.easeInOut(duration: 0.5).repeatForever() is applied to create a smooth, repeating blink effect.


When the BlinkingView appears on the screen, the isBlinking state variable is set to true, triggering the animation to start. The circle will then blink continuously until the view is removed from the screen.


How to create a blinking progress bar in SwiftUI?

To create a blinking progress bar in SwiftUI, you can use a combination of a ProgressBar view and a Timer to toggle the visibility of the progress bar at regular intervals. Here's an example of how you can achieve this:

  1. Create a ProgressBar view that displays a rectangular shape with a width that changes according to the progress percentage:
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struct ProgressBar: View {
    var progress: CGFloat
    
    var body: some View {
        GeometryReader { geometry in
            ZStack(alignment: .leading) {
                Rectangle()
                    .frame(width: geometry.size.width, height: 10)
                    .opacity(0.3)
                    .foregroundColor(.gray)
                
                Rectangle()
                    .frame(width: geometry.size.width * self.progress, height: 10)
                    .foregroundColor(.blue)
            }
        }
    }
}


  1. Create a ContentView that includes the ProgressBar view and a Timer that toggles the visibility of the progress bar at regular intervals:
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struct ContentView: View {
    @State private var progress: CGFloat = 0
    @State private var isShowingProgressBar = true
    
    var body: some View {
        VStack {
            if isShowingProgressBar {
                ProgressBar(progress: progress)
                    .animation(.easeInOut(duration: 1))
            }
            
            Button(action: {
                self.isShowingProgressBar.toggle()
            }) {
                Text("Toggle Progress Bar")
            }
        }
        .onAppear {
            Timer.scheduledTimer(withTimeInterval: 2, repeats: true) { timer in
                withAnimation {
                    self.progress = self.progress == 1 ? 0 : 1
                }
            }
        }
    }
}


  1. Finally, add the ContentView to your main view in the SceneDelegate:
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let contentView = ContentView()

if let windowScene = scene as? UIWindowScene {
    let window = UIWindow(windowScene: windowScene)
    window.rootViewController = UIHostingController(rootView: contentView)
    self.window = window
    window.makeKeyAndVisible()
}


This code will create a blinking progress bar that toggles its visibility and fills up at regular intervals. You can customize the appearance and behavior of the progress bar by adjusting the properties and animations in the ProgressBar and ContentView views.


How to create a pulsing border around a view in SwiftUI?

In SwiftUI, you can create a pulsing border around a view by using a combination of Color, View, ScaleEffect, Animate, and Cyclic animations. Below is an example of how to achieve this:

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import SwiftUI

struct PulsingBorderView: View {
    @State private var pulsate: Bool = false
    
    var body: some View {
        Circle()
            .stroke(Color.blue, lineWidth: 2)
            .scaleEffect(pulsate ? 1.3 : 1)
            .animation(Animation.easeInOut(duration: 1.5).repeatForever(autoreverses: true))
            .onAppear {
                self.pulsate.toggle()
            }
    }
}

struct ContentView: View {
    var body: some View {
        VStack {
            PulsingBorderView()
                .frame(width: 100, height: 100)
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}


In this example, we create a PulsingBorderView that is a Circle with a blue stroke of 2 points. We then apply a scaleEffect modifier that scales the circle by 1.3 when the pulsate state is true. We use the animation modifier to create a pulsating effect by scaling the circle up and down using a repeatForever animation. Finally, we toggle the pulsate state when the view appears using the onAppear modifier.


You can customize the pulsing border further by adjusting the duration, scale factor, and color in the code above.

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