In this article, we will learn how to create a thumbnail seek/scrubber bar using SwiftUI. A thumbnail seek/scrubber bar is a useful feature that allows users to preview and navigate through a video or audio file by dragging a slider.
To create a thumbnail seek/scrubber bar, we will be using SwiftUI, Apple's modern framework for building user interfaces across all Apple platforms. SwiftUI provides a declarative syntax, making it easier to understand and write code.
Let's get started by creating a new SwiftUI project in Xcode. Open Xcode and select "Create a new Xcode project". Choose "App" as the template and SwiftUI as the interface.
Once the project is created, open the ContentView.swift file. This is where we will write our code for the thumbnail seek/scrubber bar.
First, let's create a basic layout for our thumbnail seek/scrubber bar. Add the following code inside the body property of the ContentView struct:
struct ContentView: View {
var body: some View {
VStack {
Text("Thumbnail Seek/Scrubber Bar")
.font(.title)
.padding()
Spacer()
Slider(value: .constant(0.5))
.padding()
Spacer()
}
}
}
In the above code, we have used a VStack to stack our views vertically. We have added a Text view to display the title of our thumbnail seek/scrubber bar. We have also added a Slider view to represent the seek/scrubber bar itself.
Next, let's add some additional functionality to our thumbnail seek/scrubber bar. We will use a custom SliderStyle to customize the appearance of the slider and add thumbnail images at specific intervals.
Add the following code after the Slider view:
Slider(value: .constant(0.5), in: 0...1) { _ in }
.padding()
.sliderStyle(ThumbnailSliderStyle(thumbnails: [
Thumbnail(image: "thumbnail1", time: 0),
Thumbnail(image: "thumbnail2", time: 10),
Thumbnail(image: "thumbnail3", time: 20),
Thumbnail(image: "thumbnail4", time: 30),
Thumbnail(image: "thumbnail5", time: 40)
]))
In the above code, we have used the in parameter of the Slider view to specify the range of the slider. We have also used the sliderStyle modifier to apply our custom ThumbnailSliderStyle to the slider.
Now, let's create the ThumbnailSliderStyle. Add the following code outside the ContentView struct:
struct ThumbnailSliderStyle: SliderStyle {
var thumbnails: [Thumbnail]
func makeBody(configuration: Configuration) -> some View {
VStack {
TrackSlider(configuration: configuration)
.frame(height: 4)
HStack {
ForEach(thumbnails, id: \.self) { thumbnail in
Image(thumbnail.image)
.resizable()
.frame(width: 20, height: 20)
.offset(x: self.thumbOffset(configuration: configuration, time: thumbnail.time))
}
}
}
}
private func thumbOffset(configuration: Configuration, time: Double) -> CGFloat {
let trackWidth = configuration.trackRect.width - 20
let offset = CGFloat(time / configuration.maximumValue) * trackWidth
return offset - 10
}
}
In the above code, we have created a custom SliderStyle called ThumbnailSliderStyle. This style consists of a track and thumbnail images. We have used the TrackSlider view to represent the track of the slider.
Finally, let's create the Thumbnail struct. Add the following code outside the ContentView struct:
struct Thumbnail: Hashable {
var image: String
var time: Double
}
The Thumbnail struct represents a thumbnail image and its corresponding time in the video or audio file.
That's it! We have successfully created a thumbnail seek/scrubber bar using SwiftUI. You can now run the app to see the thumbnail seek/scrubber bar in action.
Feel free to customize the appearance and functionality of the thumbnail seek/scrubber bar according to your needs. You can add more thumbnail images at different intervals or change the size and position of the thumbnails.
References
| Website | Description |
|---|---|
| Apple Developer Documentation | Official documentation for SwiftUI |
| Stack Overflow | Online community for programming questions |