Swift 检测 UISlider 图像点击

Question

所以我有一个看起来像这样的UISlider： Image here

是这样设置的，所以图片不是UIImageView的，而是UISlider里面的图片： Image 2 here

我想添加一个功能，当用户按下左侧的图像时，它运行一个功能，当用户按下右侧的图像时，它运行另一个功能。这甚至可能吗？

Answer 1

您可以这样做。请仔细阅读cmets。

import UIKit

class ViewController: UIViewController {

    // This is linked to your storyboard layout
    @IBOutlet weak var slider: UISlider!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Add a tap gesture recognizer to the slider
        slider.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(sliderTapped(_:))))
    }

    @objc private func sliderTapped(_ tapRecognizer: UITapGestureRecognizer) {
        let location = tapRecognizer.location(in: slider)
        
        // UISlider can tell you min/max value image frames
        // CAUTION: Use images those are big enough to be easy tap targets
        // In my case, I used images of size 30x30
        let minImageRect = slider.minimumValueImageRect(forBounds: slider.bounds)
        let maxImageRect = slider.maximumValueImageRect(forBounds: slider.bounds)
        
        // Now you can check which image out of min/max was tapped
        if minImageRect.contains(location) {
            print("Min Image Tapped")
        } else if maxImageRect.contains(location) {
            print("Max Image Tapped")
        }
    }

}