iOS Swift - Animations
What will happen when this Swift animation code runs?
UIView.animate(withDuration: 1.0) {
myView.layer.cornerRadius = 20
}
What will happen when this Swift animation code runs? UIView.animate(withDuration: 1.0) { myView.layer.cornerRadius = 20 }
medium📝 Predict Output Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Understand UIView.animate with layer properties
UIView.animate can animate certain CALayer properties like cornerRadius when changed inside the closure.Step 2: Analyze the code effect
The cornerRadius changes smoothly from its current value to 20 over 1 second.Final Answer:
myView will smoothly animate its corner radius to 20 over 1 second -> Option BQuick Check:
layer.cornerRadius animates with UIView.animate = B [OK]
Quick Trick: UIView.animate animates layer.cornerRadius [OK]
Common Mistakes:
- Thinking cornerRadius isn't animatable via UIView.animate
- Believing duration must be less than 1 second
- Thinking layoutIfNeeded is required
Master "Animations" in iOS Swift
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