iOS Swift - User Input and Forms
Which of the following is the correct way to add a target action for value changes on a UISlider in Swift?
Which of the following is the correct way to add a target action for value changes on a UISlider in Swift?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Recall the method signature for adding target-action
The correct method is addTarget(_:action:for:) where action uses #selector syntax.Step 2: Match the correct syntax
slider.addTarget(self, action: #selector(sliderChanged), for: .valueChanged) correctly uses addTarget(self, action: #selector(sliderChanged), for: .valueChanged).Final Answer:
slider.addTarget(self, action: #selector(sliderChanged), for: .valueChanged) -> Option AQuick Check:
addTarget with #selector and .valueChanged = correct [OK]
Quick Trick: Use #selector for action when adding target to UISlider [OK]
Common Mistakes:
- Omitting #selector
- Using addAction instead of addTarget
- Wrong parameter names
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