在选择器视图中选择项目后需要显示文本视图

Posted 2023-03-09

【中文标题】在选择器视图中选择项目后需要显示文本视图

【英文标题】：Need to display a text view after selecting an item in picker view

【发布时间】：2016-12-02 12:04:57

【问题描述】：

我正在实现一个具有UIPickerView 的应用程序。一旦选择了选择器视图，就会将数据传递到下面名为RecipeViewController 的类中的下一个视图控制器。标签显示在此视图控制器上从选择器视图中选择了哪些项目，但是我现在需要一个文本视图来显示。我将如何在下面有两个类的代码中实现这一点？

import UIKit

class PickerViewController:  UIViewController, UIPickerViewDelegate, UIPickerViewDataSource 

    @IBOutlet weak var cocktailpicker: UIPickerView!

    var cocktails = ["Mojito","Long Island Iced Tea","Sex On The Beach","Screaming Orgasum","Cosmo","Strawberry Summer Sling","Rosini Royal","Blue Lagoon"]

    var passdata: String = ""

    override func viewDidLoad() 
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        self.cocktailpicker.delegate = self
        self.cocktailpicker.dataSource = self
        passdata = cocktails[0]
    

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

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int 
        return cocktails.count
    
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? 
        return cocktails[row]
    
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) 
        passdata = cocktails[row]
        //cocktails[pickerView.selectedRowInComponent(0)]
        print(cocktails[row])
    

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


    /*
     // MARK: - Navigation

     // In a storyboard-based application, you will often want to do a little preparation before navigation
     override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) 
     // Get the new view controller using segue.destinationViewController.
     // Pass the selected object to the new view controller.
     
     */

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) 
        if (segue.identifier == "seguepicker") 

            if let rvc: RecipeViewController = segue.destinationViewController as? RecipeViewController 
                rvc.toPass = passdata
            
            //var rvc = segue.destinationViewController as RecipeViewController;
            //rvc.toPass = selectedValue
        
    



import UIKit

class RecipeViewController: UIViewController 

    var toPass:String!
    @IBOutlet weak var labelPassedData: UILabel!

    override func viewDidLoad() 
        super.viewDidLoad()
        labelPassedData.text = toPass
        // Do any additional setup after loading the view.
    

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

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) 
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    
    */

【问题讨论】：

如果您从选取器视图中选择特定项目，我希望它显示与标签类似的不同文本视图。

【参考方案1】：

这是一种选择：

如果您选择使用此选项，我会考虑传递鸡尾酒数组。 可能有更简洁的选项，例如使用enum。

class RecipeViewController: UIViewController 

    var toPass:String!
    var cocktails = ["Mojito","Long Island Iced Tea","Sex On The Beach","Screaming Orgasum","Cosmo","Strawberry Summer Sling","Rosini Royal","Blue Lagoon"]

    @IBOutlet weak var labelPassedData: UILabel!
    @IBOutlet weak var recipeTextView: UITextView!
    @IBOutlet weak var cocktailImageView: UIImageView!

    override func viewDidLoad() 
        super.viewDidLoad()

        if let image = UIImage(named: "Mojito.png") 
            cocktailImageView.image = image
         else 
          print("Image is missing")
        
        labelPassedData.text = toPass
        // Do any additional setup after loading the view.
        switch toPass 
        case cocktails[0]:
            recipeTextView.text = "Lime, sugar, mint..."
        case cocktails[1]:
            recipeTextView.text = "Long Island ingredients..."
        default: 
            recipeTextView.text = ""
        
       if let 
    

请注意，图像名称应与数组中的元素匹配。

【讨论】：

我试过这个，但运行时出现线程错误。谢谢

你连接文本视图插座了吗？

如何添加图片