我们的 UIPickerView 具有深色背景，并且选择线非常难以看到。有没有办法把它们改成我选择的颜色？
更新：我说的是“熊猫”项目上方和下方的 ---。
Cat
Dog
Elephant
-----------
Panda
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Bear
Giraffe
【问题讨论】：
标签： ios iphone xcode ipad uipickerview
斯威夫特 4.2
func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
pickerView.subviews[1].backgroundColor = UIColor.white
pickerView.subviews[2].backgroundColor = UIColor.white
return view
}
这对我有用！
【讨论】：
这里已经回答了这个问题：How to change the color of UIPickerView Selector
基本上：
pickerView.subviews[1].backgroundColor = UIColor.whiteColor()
pickerView.subviews[2].backgroundColor = UIColor.whiteColor()
【讨论】：
titleForRow 或使用子类，例如-(void)willMoveToSuperview:(UIView )newSuperview { [super willMoveToSuperview:newSuperview]; self.backgroundColor = [LTPickerView 外观].backgroundColor; } -(void)didAddSubview:(UIView *)subview { [super didAddSubview:subview]; if ( subview.bounds.size.height 外观TintColor = [LTPickerView外观].tintColor; if ( appearanceTintColor ) { subview.backgroundColor = appearanceTintColor; } } }
我能提供的最佳解决方案是将 2 个 UIImages 放置在您的选择轮顶部，宽度为 1，长度设置为您的偏好。这就是我克服这一点的方法。
如果您需要多个尺寸的视图，它就不能很好地工作，因此以编程方式来满足您的尺寸变化将是下一个最佳解决方案。使用 if 语句以编程方式更改大小：
How to resize the image programmatically in objective-c in iphone
如果您根据方向更改大小，请添加一个处理方向的if 语句，如下所示：
if (UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation))
{
// code for landscape orientation
}
if (UIDeviceOrientationIsPortrait([UIDevice currentDevice].orientation))
{
// code for Portrait orientation
}
亲切的问候
【讨论】：
showsSelectionIndicator 设置为NO。
将此添加到您的UIPickerView 的viewForRow、titleForRow 或attributedTitleForRow：
for lineSubview in pickerView.subviews {
if lineSubview.frame.height < 1 {
lineSubview.backgroundColor = UIColor.white.withAlphaComponent(0.15)
}
}
这应该更安全一些，因为我们正在寻找高度应该非常短的子视图。如果 Apple 更改视图层次结构，它很可能不会搞砸任何事情 :)
【讨论】：
试试这样的：
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
//On Selecting the component row
if (component == 0) {
} else if (component == 1) {
[quantityPickerDelegate didChangeLabelText:[pickerArray objectAtIndex:row]];// delegate passing the selected value
[pickerView reloadComponent:component]; //This will cause your viewForComp to hit
}
}
- (UIView *)viewForRow:(NSInteger)row forComponent:(NSInteger)component
{
//...
//Your usual code
pickerLabel.textColor = defaultColor;
if([self.pickerView selectedRowInComponent:component] == row) //this is the selected one, change its color
{
pickerLabel.textColor = [UIColor colorWithRed:0.0745 green:0.357 blue:1.0 alpha:1];
}
}
【讨论】：
您可以使用 UIPickerView 的私有标头更改选择器视图选择线颜色。只需为_magnifierLineColor 键设置颜色
pickerView.setValue(UIColor.red, forKey: "_magnifierLineColor")
【讨论】：
这就是我在 Swift 4.2
中的做法private let pickerSelectionIndicatorHeight: CGFloat = 62.0
let pickerSelectionIndicatorTopLine = UIView()
let pickerSelectionIndicatorBottomLine = UIView()
pickerSelectionIndicatorTopLine.backgroundColor = UIColor.white
pickerSelectionIndicatorBottomLine.backgroundColor = UIColor.white
picker.addSubview(pickerSelectionIndicatorTopLine)
picker.addSubview(pickerSelectionIndicatorBottomLine)
pickerSelectionIndicatorTopLine.translatesAutoresizingMaskIntoConstraints = false
pickerSelectionIndicatorTopLine.leadingAnchor.constraint(equalTo: picker.leadingAnchor, constant: 0).isActive = true
pickerSelectionIndicatorTopLine.trailingAnchor.constraint(equalTo: picker.trailingAnchor, constant: 0).isActive = true
pickerSelectionIndicatorTopLine.heightAnchor.constraint(equalToConstant: 1).isActive = true
pickerSelectionIndicatorTopLine.centerYAnchor.constraint(equalTo: picker.centerYAnchor, constant: -(pickerSelectionIndicatorHeight / 2 + 1.0)).isActive = true
pickerSelectionIndicatorBottomLine.translatesAutoresizingMaskIntoConstraints = false
pickerSelectionIndicatorBottomLine.leadingAnchor.constraint(equalTo: picker.leadingAnchor, constant: 0).isActive = true
pickerSelectionIndicatorBottomLine.trailingAnchor.constraint(equalTo: picker.trailingAnchor, constant: 0).isActive = true
pickerSelectionIndicatorBottomLine.heightAnchor.constraint(equalToConstant: 1).isActive = true
pickerSelectionIndicatorBottomLine.centerYAnchor.constraint(equalTo: picker.centerYAnchor, constant: (pickerSelectionIndicatorHeight / 2 + 1.0)).isActive = true
如果需要，当然可以将此代码封装在扩展中。
【讨论】：