Question

我有三个Pickerview，如下图所示。我主要的挑选视图，左挑选视图和正确的挑选视图。

主pickerview数组有一组名称，每个名称都有一组单位。我已经在数组内部进行了数组，以便向它们显示它所属的位置。但我不能这样做。主要的kekerview数组在pickerviews的thr righ和left中都显示出来。

这是我的代码：

import UIKit

类ViewController：UIViewController，UIPickerViewDataSource，UIPickerViewDelegate，UITextFieldDelegate {

@IBOutlet weak var mainPicker: UIPickerView!
@IBOutlet weak var leftPicker: UIPickerView!
@IBOutlet weak var rightPicker: UIPickerView!
@IBOutlet weak var textFieldLeft: UITextField!
@IBOutlet weak var textFielfRight: UITextField!
@IBOutlet weak var equal: UILabel!

var mainPickerData = []
var leftPickerData = []
var rightPickerData = []

//yourPicker.backgroundColor = UIColor(patternImage: UIImage(named: "back.jpg")!)


override func viewDidLoad() {
    super.viewDidLoad()

    // Connect data:
    self.mainPicker.delegate = self
    self.mainPicker.dataSource = self

    self.leftPicker.delegate = self
    self.leftPicker.dataSource = self

    self.rightPicker.delegate = self
    self.rightPicker.dataSource = self

    let theWidth = view.frame.size.width
    let theHeight = view.frame.size.height

    mainPicker.center = CGPointMake(theWidth/2, theHeight/2 - 182.5)
    leftPicker.center = CGPointMake(theWidth/2 - 100, theHeight/2)
    rightPicker.center = CGPointMake(theWidth/2 + 100, theHeight/2)
    textFieldLeft.center = CGPointMake(theWidth/2 - 90, theHeight/2 + 110)
    textFielfRight.center = CGPointMake(theWidth/2 + 90, theHeight/2 + 110)
    equal.center = CGPointMake(theWidth/2, theHeight/2 + 110)



    let Area = ["Square Mile", "Square Yard", "Square Foot", "Square Inch", "Hectare", "Acre", "Square Kilometer", "Square Meter", "Square Centimeter", " Square Millimeter"]

    let Energy = ["Btus", "Calories", "Ergs", "Foot-Pounds", "Joules", "Kilogram-Calories", "Kilogram-Meters", "Kilowatt-Hours", "Newton-Meters", "Watt-Hours"]

    let Length = ["Mile", "Yard", "Foot", "Inch", "Kilometer", "Meter", "Centimeter", "Millimeter"]

    let Power = ["Btus/Minute", "Foot-Pounds/Min", "Foot-Pounds/Sec", "Horsepower", "Kilowatts", "Watts"]

    let Pressure = ["Pounds/Sqr Ft", "Pounds/Sqr In", "Atmospheres", "Bars", "In of Mercury", "Cm of Mercury", "Kilograms/Sqr Meter", "Pascals"]

    let Speed = ["Knots", "Miles/Hr", "Miles/Min", "Feet/Min", "Feet/Sec", "Kilometers/Hr", "Kilometer/Min", "Meters/Sec"]

    let Temperature = ["Celsius C˚", "Fahrenheit", "Kelvin"]

    let Time = ["Years", "Months", "Weeks", "Days", "Hours", "Minutes", "Seconds", "Millisconds", "Microseconds", " Nanoseconds"]

    let Volume = ["Cupic Feet","Cubic Meter", "Gallon (Imp)", "Gallon (US)", "Quart (US)", "Pint (US)", "Fluid Oz", "Cup", "Tablespoon", "Teaspoon", "Dram (US)", "Liter"]

    let Weight = ["Short Ton (US)","Long Ton (UK)", "Pound (U.S)", "Ounce (US)", "Stone", "Metric Ton", "Kilogram", "Gram"]

    // Pickerview at the center top side of Screen.
    mainPickerData = ["Area", "Energy", "Length", "Power", "Pressure", "Speed", "Temperature", "Time", "Volume", "Weight"]

    // Pickerview at the lower left side of Screen.
    leftPickerData = [["Square Mile", "Square Yard", "Square Foot", "Square Inch", "Hectare", "Acre", "Square Kilometer", "Square Meter", "Square Centimeter", " Square Millimeter"], ["Square Mile", "Square Yard", "Square Foot", "Square Inch", "Hectare", "Acre", "Square Kilometer", "Square Meter", "Square Centimeter", " Square Millimeter"], ["Mile", "Yard", "Foot", "Inch", "Kilometer", "Meter", "Centimeter", "Millimeter"], ["Btus/Minute", "Foot-Pounds/Min", "Foot-Pounds/Sec", "Horsepower", "Kilowatts", "Watts"], ["Pounds/Sqr Ft", "Pounds/Sqr In", "Atmospheres", "Bars", "In of Mercury", "Cm of Mercury", "Kilograms/Sqr Meter", "Pascals"], ["Knots", "Miles/Hr", "Miles/Min", "Feet/Min", "Feet/Sec", "Kilometers/Hr", "Kilometer/Min", "Meters/Sec"],["Celsius C˚", "Fahrenheit", "Kelvin"], ["Years", "Months", "Weeks", "Days", "Hours", "Minutes", "Seconds", "Millisconds", "Microseconds", " Nanoseconds"], ["Cupic Feet","Cubic Meter", "Gallon (Imp)", "Gallon (US)", "Quart (US)", "Pint (US)", "Fluid Oz", "Cup", "Tablespoon", "Teaspoon", "Dram (US)", "Liter"], ["Short Ton (US)","Long Ton (UK)", "Pound (U.S)", "Ounce (US)", "Stone", "Metric Ton", "Kilogram", "Gram"]]

    // Pickerview at the lower Right side of Screen.
    rightPickerData = [["Square Mile", "Square Yard", "Square Foot", "Square Inch", "Hectare", "Acre", "Square Kilometer", "Square Meter", "Square Centimeter", " Square Millimeter"], ["Square Mile", "Square Yard", "Square Foot", "Square Inch", "Hectare", "Acre", "Square Kilometer", "Square Meter", "Square Centimeter", " Square Millimeter"], ["Mile", "Yard", "Foot", "Inch", "Kilometer", "Meter", "Centimeter", "Millimeter"], ["Btus/Minute", "Foot-Pounds/Min", "Foot-Pounds/Sec", "Horsepower", "Kilowatts", "Watts"], ["Pounds/Sqr Ft", "Pounds/Sqr In", "Atmospheres", "Bars", "In of Mercury", "Cm of Mercury", "Kilograms/Sqr Meter", "Pascals"], ["Knots", "Miles/Hr", "Miles/Min", "Feet/Min", "Feet/Sec", "Kilometers/Hr", "Kilometer/Min", "Meters/Sec"],["Celsius C˚", "Fahrenheit", "Kelvin"], ["Years", "Months", "Weeks", "Days", "Hours", "Minutes", "Seconds", "Millisconds", "Microseconds", " Nanoseconds"], ["Cupic Feet","Cubic Meter", "Gallon (Imp)", "Gallon (US)", "Quart (US)", "Pint (US)", "Fluid Oz", "Cup", "Tablespoon", "Teaspoon", "Dram (US)", "Liter"], ["Short Ton (US)","Long Ton (UK)", "Pound (U.S)", "Ounce (US)", "Stone", "Metric Ton", "Kilogram", "Gram"]]
}

// The number of columns of data
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

// The number of rows of data
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

    if mainPicker.tag == 1 {

        return mainPickerData.count

    }else if leftPicker.tag == 2 {

        return leftPickerData.count

    }else{

        return rightPickerData.count
    }
}

// The data to return for the row and component (column) that's being passed in
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

    if mainPicker.tag == 1 {

        return mainPickerData[row] as? String
    }else if leftPicker.tag == 2 {

        return leftPickerData[row] as? String

    }else{

        return rightPickerData[row] as? String
    }


}

// Catpure the picker view selection
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    // This method is triggered whenever the user makes a change to the picker selection.
    // The parameter named row and component represents what was selected.
}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

    self.view.endEditing(true)

}

func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
    let titleData = mainPickerData[row]
    let myTitle = NSAttributedString(string: titleData as! String, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 15.0)!,NSForegroundColorAttributeName:UIColor.blueColor()])
    return myTitle
}

}

Answer 1

不是采用Array，而是为您的主数据源创建Dictionary，并正确使用它来获取numberOfRowsInComponent计数和titleForRow。

let dataDict:NSMutableDictionary = ["Area":["Square Mile", "Square Yard", "Square Foot", "Square Inch", "Hectare", "Acre", "Square Kilometer", "Square Meter", "Square Centimeter", " Square Millimeter"]
        ,"Energy":["Btus", "Calories", "Ergs", "Foot-Pounds", "Joules", "Kilogram-Calories", "Kilogram-Meters", "Kilowatt-Hours", "Newton-Meters", "Watt-Hours"]]
let mainPickerData = dataDict.allKeys;
let leftPickerData = dataDict.objectForKey("Energy"); //here you can pas the string return from pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) delegate for main picker

print(mainPickerData);
print(leftPickerData);

如果你左右选择器应该包含相同的数据，你可以使用一个数据源。

同样在代理人func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?

中

不检查选择器实例上的标记，如果您已经为选择器设置了标记，则使用方法签名中的pickerView对象来检查标记。这样做

if pickerView.tag == 1 {...} 
else if (pickerView.tag == 2) {...}

数据在所有选择器中显示相同的原因是func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? 条件总是如此。即mainPicker.tag == 1，如果你为mainPicker设置了标签1，那么它返回所有选择器的数据相同。

更新的解决方案

 // The number of columns of data
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

// The number of rows of data
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

    switch (pickerView.tag) {

    case mainPicker.tag:

        return mainPickerData.count

    case leftPicker.tag,rightPicker.tag:

        let currentSelectedIndex = mainPicker.selectedRowInComponent(0)
        leftRightPickerData = (dataDict.objectForKey(mainPickerData[currentSelectedIndex] as! String) as! NSArray)

        return leftRightPickerData.count;

    default:
        break;
    }
    return 0;
}//F.E

// The data to return for the row and component (column) that's being passed in
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

    switch (pickerView.tag) {

    case mainPicker.tag:

        return mainPickerData[row] as? String;

    case leftPicker.tag,rightPicker.tag:

        let currentSelectedIndex = mainPicker.selectedRowInComponent(0)
        leftRightPickerData = (dataDict.objectForKey(mainPickerData[currentSelectedIndex] as! String) as! NSArray)

        return leftRightPickerData[row] as? String;

    default:
        break;
    }

    return "";

}

// Catpure the picker view selection
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    // This method is triggered whenever the user makes a change to the picker selection.
    // The parameter named row and component represents what was selected.
    if(pickerView.tag == 1 ){

        let currentSelectedIndex = mainPicker.selectedRowInComponent(0)
        leftRightPickerData = (dataDict.objectForKey(mainPickerData[currentSelectedIndex] as! String) as! NSArray)

        leftPicker.reloadAllComponents();
        rightPicker.reloadAllComponents();
    }
}

以上是UIPickerView delegate和datasource的实施方案。在viewDidLoad()

中写下以下代码

    dataDict = ["Area":["Square Mile", "Square Yard", "Square Foot", "Square Inch", "Hectare", "Acre", "Square Kilometer", "Square Meter", "Square Centimeter", " Square Millimeter"]
        ,"Energy":["Btus", "Calories", "Ergs", "Foot-Pounds", "Joules", "Kilogram-Calories", "Kilogram-Meters", "Kilowatt-Hours", "Newton-Meters", "Watt-Hours"]]
    mainPickerData = dataDict.allKeys;
    leftRightPickerData = dataDict.objectForKey(mainPickerData.firstObject as! String) as! NSArray

我刚刚为您的代码添加了2个键/值对，您可以在dataDict中添加其余值。

在viewDidLoad()

之前将以下代码粘贴到您的班级中

var dataDict:NSMutableDictionary!
var mainPickerData:NSArray!
var leftRightPickerData:NSArray!

关于多个UIPickerview

1 个答案: