在选择器视图Swift 1.2中更改所选行标签的颜色 [英] Change selected row label color in picker view swift 1.2
本文介绍了在选择器视图Swift 1.2中更改所选行标签的颜色的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我用以下代码创建了pickerview
I have a created the pickerview with the following code
@IBOutlet var myPicker: UIPickerView!
var colors: [String] = ["red","green","blue"]
override func viewDidLoad() {
super.viewDidLoad()
myPicker = UIPickerView()
myPicker.dataSource = self
myPicker.delegate = self
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return colors.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
return colors[row] as! String
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
}
现在,我想更改所选行的标签(文本)颜色,例如,如果我向下滚动并选择蓝色,则文本颜色应更改为橙色,而其他2个标签将为黑色,当我选择时也是如此其他行.我已经尝试了以下代码,但是没有用
Now i want to change the label (text) color of the selected row, for example if i scroll down and select blue, the text color should change to orange and the other 2 labels will be black, same follows when i select other rows. i have tried the following code but it doesn't work
func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView!) -> UIView {
var pickerLabel = UILabel()
var myTitle:NSAttributedString
let titleData = colors[row]
if pickerView.selectedRowInComponent(component) == row {
myTitle = NSAttributedString(string: titleData, attributes: [NSForegroundColorAttributeName: UIColor.redColor()])
} else {
myTitle = NSAttributedString(string: titleData, attributes: [NSForegroundColorAttributeName: UIColor.blueColor()])
}
//This way you can set text for your label.
pickerLabel.attributedText = myTitle
return pickerLabel
}
我不知道应该使用didSelectRow还是viewForRow方法来实现它,有人可以帮我吗?
I dont know whether i should implement it with didSelectRow or viewForRow method, can someone please help me on this?
推荐答案
您可以执行以下操作:
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
var colors = ["red","green","blue"]
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return colors.count
}
func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
let color = (row == pickerView.selectedRowInComponent(component)) ? UIColor.orangeColor() : UIColor.blackColor()
return NSAttributedString(string: colors[row], attributes: [NSForegroundColorAttributeName: color])
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
pickerView.reloadAllComponents()
}
}
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