ios Swift - 按下 BarButtonItem 时以编程方式创建和显示 UIPickerView
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Swift - Programmatically create and display UIPickerView when BarButtonItem is pressed
提问by Javz
Initially I wanted to add a hidden UIPickerView onto the Main.storyboard alongside my existing UISearchBar and when a BarButtonItem is clicked, the UIPickerView should be displayed; but it appears I cannot have them both at once in a given space.
最初，我想在 Main.storyboard 上添加一个隐藏的 UIPickerView，与我现有的 UISearchBar 一起，当点击 BarButtonItem 时，应该显示 UIPickerView；但似乎我不能在给定的空间中同时拥有它们。
So instead, my best alternative was to create it programmatically. I've followed existing tutorials (http://sourcefreeze.com/ios-uipickerview-example-using-swift/) and similar questions (Programmatically Create and Show UIPickerView) and seems like I do (?) have a UIPickerView as the description of it is being printed and I get the following:
因此，我最好的选择是以编程方式创建它。我遵循了现有的教程（http://sourcefreeze.com/ios-uipickerview-example-using-swift/）和类似的问题（以编程方式创建和显示 UIPickerView），似乎我（？）有一个 UIPickerView 作为描述它正在打印，我得到以下信息：
<UIPickerView: 0x7f86425b1fb0; frame = (100 100; 100 162); layer = <CALayer: 0x7f8642543a20>>
Here is part of my current code which may be of help:
这是我当前代码的一部分，可能会有所帮助：
AnimalTableViewController.swift
AnimalTableViewController.swift
import UIKit
class AnimalTableViewController: UITableViewController, UINavigationControllerDelegate, UISearchBarDelegate, UISearchDisplayDelegate, UISearchResultsUpdating, UIPickerViewDelegate, UIPickerViewDataSource {
@IBOutlet var segmentedSortOption: UISegmentedControl!
var array : NSArray = Animal.animalStruct.jsonResult["animal"] as NSArray
var filteredArray = [[String:AnyObject]]()
var timer = NSTimer()
var counter:Int = 1
var typePickerView: UIPickerView = UIPickerView()
@IBOutlet var typeBarButton: UIBarButtonItem!
var resultSearchController = UISearchController()
var indexArray:String!
@IBAction func refresh(sender: AnyObject) {
self.tableView.reloadData()
println("refreshed")
}
override func viewDidLoad() {
super.viewDidLoad()
self.typePickerView.hidden = true
self.typePickerView.dataSource = self
self.typePickerView.delegate = self
self.typePickerView.frame = CGRectMake(100, 100, 100, 162)
self.typePickerView.backgroundColor = UIColor.blackColor()
self.typePickerView.layer.borderColor = UIColor.whiteColor().CGColor
self.typePickerView.layer.borderWidth = 1
timer = NSTimer.scheduledTimerWithTimeInterval(0.2, target: self, selector: Selector("result"), userInfo: nil, repeats: true)
self.resultSearchController = ({
let controller = UISearchController(searchResultsController: nil)
controller.searchResultsUpdater = self
controller.dimsBackgroundDuringPresentation = false
controller.searchBar.sizeToFit()
self.tableView.tableHeaderView = controller.searchBar
return controller
})()
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return array.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
return array[row]["type1"] as String
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
typeBarButton.title = array[row]["type1"] as? String
typePickerView.hidden = false
}
func pickerView(pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat {
return 36.0
}
func pickerView(pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
return 36.0
}
@IBAction func typePickerViewSelected(sender: AnyObject) {
typePickerView.hidden = false
println(typePickerView.description)
}
}
Please could you help me display the programmatically created UIPickerView when the BarButtonItem is pressed? If you have any more questions, please do ask.
请您帮我在按下 BarButtonItem 时显示以编程方式创建的 UIPickerView 吗？如果您还有其他问题，请务必提问。
Many thanks.
非常感谢。
采纳答案by pbush25
You never add the pickerViewas a subview of the ViewController, which you can do in viewDidLoad()since you're hiding it. Then when you unhide it your view should be there.
您永远不会将 添加pickerView为 的子视图，因为您隐藏了它ViewController，所以您可以在其中执行viewDidLoad()此操作。然后，当您取消隐藏它时，您的视图应该在那里。
EDIT: Added Code
编辑：添加代码
override func viewDidLoad() {
super.viewDidLoad()
self.typePickerView.hidden = true
//other pickerView code like dataSource and delegate
self.view.addSubview(pickerView) //will add the subview to the view hierarchy
}
With the above code, now when you unhide it on button press the view will show up.
使用上面的代码，现在当您在按钮上取消隐藏它时，将显示视图。
