如何限制UIPickerView组件 [英] How to restrict UIPickerView Component

问题描述

如何限制UIPickerView组件滚动.

我在UIPickeView中有两个组件，第二个组件结束滚动，允许用户触摸第一个组件以更改其中的值.

I have two components in UIPickeView one second component ends scroll allows user to touch the first component to change the value in it.

如何限制用户触摸第一个组件，直到第二个组件滚动补充为止.

推荐答案

使用此扩展名，您可以检查UIPickerView是否为是否滚动.取决于滚动，您可以启用/禁用与UIPickerView的交互.

Using this extension, you can check UIPickerView is scrolling or not. Depend on scrolling, you can enable/disable interaction with UIPickerView.

extension UIView {

    func isScrolling () -> Bool {

        if let scrollView = self as? UIScrollView {
            if (scrollView.isDragging || scrollView.isDecelerating) {
                return true
            }
        }

        for subview in self.subviews {
            if subview.isScrolling() {
                return true
            }
        }
        return false
    }
}

UIPickerViewDelegate是否检测滚动.

UIPickerViewDelegate to detect scrolling or not.

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

    if pickerView.isScrolling() {
        pickerView.isUserInteractionEnabled = false
    } else {
        pickerView.isUserInteractionEnabled = true
    }

    //Use this for reduce lines
    //pickerView.isUserInteractionEnabled = !pickerView.isScrolling()

    return "Row \(row)"
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    pickerView.isUserInteractionEnabled = true
}

唯一的问题是您无法触摸当前滚动组件，直到组件完成滚动为止.希望，有人也可以解决这个问题.

The only problem is you can not touch current scrolling component, until component completed scrolling. HOPE, someone solve this also.

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