Swift 如何在一个页面上区分多个UIPickerView 我在一个uiviewcontroller中有2个uipickerviews：

下拉菜单_1.frame=CGRectMake（…）； 下拉菜单_2.frame=CGRectMake（…）

• 对于这两个下拉列表，我有两个不同的值数组

• 我有如下功能：

func numberOfComponentsInPickerView（pickerView:UIPickerView）->Int{
返回1
}
func pickerView（pickerView:UIPickerView，numberOfRowsInComponent:Int）->Int{
return arraysize5.count；以下是您可以执行此操作的方法：

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var dropdown_1: UIPickerView!
    @IBOutlet weak var dropdown_2: UIPickerView!

    var arraySizes5 = ["sverysmall", "ssmall", "snormal", "slarge", "sverylarge"]
    var arraySizes3 = ["ssmall", "snormal", "slarge"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

        if pickerView == dropdown_1 {
            return arraySizes5.count
        } else if pickerView == dropdown_2 {
            return arraySizes3.count
        }
        return 0
    }

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

        if pickerView == dropdown_1 {
            return arraySizes5[row]
        } else if pickerView == dropdown_2 {
            return arraySizes3[row]
        }
        return ""
    }
}

以下是您可以做到这一点的方法：

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var dropdown_1: UIPickerView!
    @IBOutlet weak var dropdown_2: UIPickerView!

    var arraySizes5 = ["sverysmall", "ssmall", "snormal", "slarge", "sverylarge"]
    var arraySizes3 = ["ssmall", "snormal", "slarge"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

        if pickerView == dropdown_1 {
            return arraySizes5.count
        } else if pickerView == dropdown_2 {
            return arraySizes3.count
        }
        return 0
    }

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

        if pickerView == dropdown_1 {
            return arraySizes5[row]
        } else if pickerView == dropdown_2 {
            return arraySizes3[row]
        }
        return ""
    }
}

以下是您可以做到这一点的方法：

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var dropdown_1: UIPickerView!
    @IBOutlet weak var dropdown_2: UIPickerView!

    var arraySizes5 = ["sverysmall", "ssmall", "snormal", "slarge", "sverylarge"]
    var arraySizes3 = ["ssmall", "snormal", "slarge"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

        if pickerView == dropdown_1 {
            return arraySizes5.count
        } else if pickerView == dropdown_2 {
            return arraySizes3.count
        }
        return 0
    }

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

        if pickerView == dropdown_1 {
            return arraySizes5[row]
        } else if pickerView == dropdown_2 {
            return arraySizes3[row]
        }
        return ""
    }
}

以下是您可以做到这一点的方法：

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var dropdown_1: UIPickerView!
    @IBOutlet weak var dropdown_2: UIPickerView!

    var arraySizes5 = ["sverysmall", "ssmall", "snormal", "slarge", "sverylarge"]
    var arraySizes3 = ["ssmall", "snormal", "slarge"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

        if pickerView == dropdown_1 {
            return arraySizes5.count
        } else if pickerView == dropdown_2 {
            return arraySizes3.count
        }
        return 0
    }

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

        if pickerView == dropdown_1 {
            return arraySizes5[row]
        } else if pickerView == dropdown_2 {
            return arraySizes3[row]
        }
        return ""
    }
}

您将pickerview作为参数，因此此函数将使用不同的UIPickerView调用两次。如何比较它们，如if（pickerview==dropdown_1）{return arraySizes5.count}或者if（pickerview==dropdown_2）{return arraySizes3.count}您将pickerview作为参数，因此此函数将使用不同的UIPickerView调用两次。如何比较它们，如if（pickerview==dropdown_1）{return arraySizes5.count}或者if（pickerview==dropdown_2）{return arraySizes3.count}您将pickerview作为参数，因此此函数将使用不同的UIPickerView调用两次。如何比较它们，如if（pickerview==dropdown_1）{return arraySizes5.count}或者if（pickerview==dropdown_2）{return arraySizes3.count}您将pickerview作为参数，因此此函数将使用不同的UIPickerView调用两次。如何比较它们，如if（pickerview==dropdown_1）{return arraySizes5.count}或者if（pickerview==dropdown_2）{return arraySizes3.count}