以编程方式快速切换视图 [英] Programmatically switching views swift
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问题描述
我正在 Xcode 6 beta 中试用苹果的新语言 swift.我试图在按下表视图单元格时以编程方式切换视图,尽管它所做的只是拉出一个空白的黑屏.在我的代码中,我注释掉了不起作用的东西.他们只会让 iOS 模拟器崩溃.我的代码:
I am trying out apple's new language swift in Xcode 6 beta. I am trying to programmatically switch views when a table view cell is pressed, although all it does is pull up a blank black screen. In my code, I commented out the things that didn't work. They would just make the iOS simulator crash. my code:
// ViewController.swift
// Step-By-Step Tip Calculator
// Created by Dani Smith on 6/17/14.
// Copyright (c) 2014 Dani Smith Productions. All rights reserved.
import UIKit
var billTotalPostTax = 0
class BillInfoViewController: UIViewController {
//outlets
@IBOutlet var totalTextField: UITextField
@IBOutlet var taxPctLabel: UILabel
@IBOutlet var resultsTextView: UITextView
@IBOutlet var taxPctTextField : UITextField
//variables
var billTotalVar = ""
var taxPctVar = ""
//actions
override func viewDidLoad() {
super.viewDidLoad()
refreshUI()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func stepOneNextPressed(sender : AnyObject)
{
billTotalVar = totalTextField.text
taxPctVar = taxPctTextField.text
}
@IBAction func calculateTipped(sender : AnyObject)
{
tipCalc.total = Double(totalTextField.text.bridgeToObjectiveC().doubleValue)
let possibleTips = tipCalc.returnPossibleTips()
var results = ""
for (tipPct, tipValue) in possibleTips
{
results += "\(tipPct)%: \(tipValue)\n"
}
resultsTextView.text = results
}
/*
@IBAction func taxPercentageChanged(sender : AnyObject)
{
tipCalc.taxPct = String(taxPctTextField.text) / 100
refreshUI()
}*/
@IBAction func viewTapped(sender : AnyObject)
{
totalTextField.resignFirstResponder()
}
let tipCalc = TipCalculatorModel(total: 33.25, taxPct: 0.06)
func refreshUI()
{
//totalTextField.text = String(tipCalc.total)
}
}
class RestaurantTableViewController: UITableViewController
{
override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!)
{
let row = indexPath?.row
println(row)
//let vc:BillInfoViewController = BillInfoViewController()
//let vc = self.storyboard.instantiateViewControllerWithIdentifier("billInfo") as UINavigationController
//self.presentViewController(vc, animated: true, completion: nil)
}
}
非常感谢您的帮助.
推荐答案
我刚刚想通了.我必须做
I just figured it out. I had to make
let vc = self.storyboard.instantiateViewControllerWithIdentifier("billInfo")`
成为
let vc : AnyObject! = self.storyboard.instantiateViewControllerWithIdentifier("billInfo")
使警告静音.然后我将 presentViewController
更改为 showViewController
,并且它起作用了.这是我完成的课程:
to silence a warning. I then changed presentViewController
to showViewController
, and it worked. Here is my completed class:
class RestaurantTableViewController: UITableViewController
{
override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!)
{
let row = indexPath?.row
println(row)
let vc : AnyObject! = self.storyboard.instantiateViewControllerWithIdentifier("billInfo")
self.showViewController(vc as UIViewController, sender: vc)
}
}
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