What is the best animation curve in SwiftUI?

A spring with response around 0.4 seconds and dampingFraction around 0.8 covers most UI transitions. It feels natural, settles without bouncing, and works for buttons, sheets, and view transitions.

Why is my SwiftUI animation janky?

You are probably animating the wrong property. Animating frame or position triggers layout passes every frame. Animate scale, offset, and opacity instead — these are GPU-composited and stay smooth at 120fps.

Should I use withAnimation or .animation in SwiftUI?

Use withAnimation when a state change should animate — it wraps the state mutation. Use the .animation modifier for continuous values like drag gestures or sliders. They are not interchangeable.

What does matchedGeometryEffect do?

It animates a view between two locations in your hierarchy when it appears in a new place. The classic use case is tapping a list item and having it expand into a detail view with a smooth hero transition.

SwiftUI Animations That Don't Look Like PowerPoint

Default SwiftUI animations look like 2003 Keynote. You slap .animation(.easeInOut) on something, it slides, it works, you ship it. The app feels cheap and you don't know why.

The answer: real-world motion doesn't move in straight lines. It doesn't start and stop instantly. It has weight, it overshoots, it settles. SwiftUI gives you the tools to do this — almost nobody uses them.

Here's how I make SwiftUI animations feel premium, not PowerPoint.

The single biggest upgrade: springs, not easing curves

// Cheap animation
withAnimation(.easeInOut(duration: 0.3)) {
    isExpanded.toggle()
}
 
// Premium animation
withAnimation(.spring(response: 0.4, dampingFraction: 0.8)) {
    isExpanded.toggle()
}