[英]Custom UISlider doesn't go to end
我创建了一个 UISlider,它有刻度线,并在值更改时捕捉到每个刻度。 问题是滑块不会自然地到达末端,并且在圆圈外可以看到左右刻度。 我已经将 UISlider 类扩展到最后,但动画与将滑块移动到下一个刻度相冲突,并且圆圈最终离开屏幕。 如何保持对齐动画并让滑块中的圆圈一直走到最后? 这是我的代码
class CustomSlider: UISlider {
override func thumbRect(forBounds bounds: CGRect, trackRect rect: CGRect, value: Float) -> CGRect
{
let unadjustedThumbrect = super.thumbRect(forBounds: bounds, trackRect: rect, value: value)
let thumbOffsetToApplyOnEachSide:CGFloat = unadjustedThumbrect.size.width / 2.0
let minOffsetToAdd = -thumbOffsetToApplyOnEachSide
let maxOffsetToAdd = thumbOffsetToApplyOnEachSide
let offsetForValue = minOffsetToAdd + (maxOffsetToAdd - minOffsetToAdd) * CGFloat(value / (self.maximumValue - self.minimumValue))
var origin = unadjustedThumbrect.origin
origin.x += offsetForValue
return CGRect(origin: origin, size: unadjustedThumbrect.size)
}
}
@IBOutlet weak var slider: CustomSlider!
let tickArray : [Float] = [Float(18),Float(20),Float(22),Float(24),Float(26),Float(28),Float(30)]
override func viewDidLoad() {
super.viewDidLoad()
self.slider.value = tickArray[0]
self.slider.minimumValue = tickArray[0]
self.slider.maximumValue = tickArray[6]
self.slider.isContinuous = false
var tick : UIView
for i in 0..<tickArray.count-1 {
tick = UIView(frame: CGRect(x: (self.slider.frame.size.width/6) * CGFloat(i), y: (slider.frame.size.height - 13) / 2, width: 2, height: 13))
tick.backgroundColor = "8E8E93".hexColor
slider.insertSubview(tick, belowSubview: slider)
}
tick = UIView(frame: CGRect(x: self.slider.frame.size.width-2, y: (slider.frame.size.height - 13) / 2, width: 2, height: 13))
tick.backgroundColor = "8E8E93".hexColor
slider.insertSubview(tick, belowSubview: slider)
}
@IBAction func sliderValueChanged(_ sender: UISlider) {
if sender.value > tickArray[5] {
slider.value = tickArray[6]
} else if sender.value > tickArray[4] {
slider.value = tickArray[5]
} else if sender.value > tickArray[3] {
slider.value = tickArray[4]
} else if sender.value > tickArray[2] {
slider.value = tickArray[3]
} else if sender.value > tickArray[1] {
slider.value = tickArray[2]
} else if sender.value >
tickArray[0] {
slider.value = tickArray[1]
} else {
slider.value = tickArray[0]
}
}
当滑块移动到边缘时,我通过隐藏左右刻度来解决我的问题。 这消除了对滑块扩展的需要。
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