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You want to animate a button to pulse repeatedly to attract attention. Which approach best achieves this effect?

hard📝 Application Q8 of 15
iOS Swift - Animations
You want to animate a button to pulse repeatedly to attract attention. Which approach best achieves this effect?
AUse a timer to toggle button visibility without animation
BUse UIView.animate with autoreverse and repeat options
CDisable user interaction and change alpha once
DChange the button's title color instantly every second
Step-by-Step Solution
Solution:

  1. Step 1: Understand pulsing animation requirements

    Pulsing means smoothly growing and shrinking repeatedly.

  2. Step 2: Identify correct animation method

    UIView.animate with options .autoreverse and .repeat creates a smooth repeating pulse.

  3. Final Answer:

    Use UIView.animate with autoreverse and repeat options -> Option B

  4. Quick Check:

    Repeat and autoreverse create pulsing = D [OK]
Quick Trick: Use .autoreverse and .repeat for looping animations [OK]
Common Mistakes:
  • Changing color instantly
  • Disabling interaction unnecessarily
  • Using timers without animation

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