小编ric*_*chc的帖子

我正在寻找一种简单的方法来从shuffledWord1中删除tilesColored String"ment"中的4个字符.

var word1: String = "employment"
var shuffledWord1: String = "melpyoemtn"

var tilesColored: String = "ment"
var characters = Array(tilesColored) // gives ["m","e","n","t"]

let newWord1 = word1.StringByReplacingOccurencesOfString("\(characters[0])", withString:"") // gives "elpyoetn"

stringByReplacingOccurencesOfString只允许检查1个字符并删除BOTH m,所以我如何检查所有4个并且只删除每个的一个实例以返回"melpyo"？

提前感谢您提供任何帮助

我有一个UITableView在UIViewController并增加从代码,而不是IB编辑按钮.这附带UITableViewControllers但不是UIVC.如何在swift中使用此按钮将表格视图置于编辑模式？在此先感谢您的帮助.

class WordsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, UITextFieldDelegate  {
  override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.rightBarButtonItem = self.editButtonItem()
  }

  func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
        return true
  }
}

在我的应用程序中,我想检查已连接到手机的AVAudio portTypes.下面的代码适用于BluetoothA2DP和耳机,但是当我将手机连接到我的汽车免提装置时,它不适用于BluetoothHFP.谁能帮我？!我认为已经通过免提/ AV /蓝牙以及许多其他方面的所有SO帖子,但无法解决为什么它不能识别蓝牙输出端口类型.

import AVFoundation

func startCheckAVConnection() {

    // set the AVAudioSession to allow bluetooth. This do/try/catch doesn't seem to make a difference if it is here or not.
    do{
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord, with: AVAudioSessionCategoryOptions.allowBluetooth)
    } catch{
        print(error)
    }

    // Check possible outputs for handsfree
    let outputs = AVAudioSession.sharedInstance().currentRoute.outputs

    if outputs.count != 0 {
        for output in outputs {
            if output.portType == AVAudioSessionPortBluetoothA2DP {
                peripheralLabel.text = "connected to BluetoothA2DP"
            } else if output.portType == AVAudioSessionPortBluetoothHFP { // NOT RECOGNISED
                peripheralLabel.text …

我有一个在NSObject类中的代码中创建的UI按钮,它控制UIViewController类中的游戏.该按钮在游戏的大部分时间内都能正常工作,但在某个时刻,我希望按钮能够淡出/淡出.一旦fadein/out开始动画,按钮就不再是交互式的.我已经设置了.AllowUserInteraction选项,但仍然没有运气.我很难过这个,所以任何帮助都非常感谢!

Class GameController: NSObject {
var gameView: UIView!
var nextButton: UIButton!

func gameViewSetUp() {
    // create the nextButton
    let imageNextButton = UIImage(named: "rightArrow") as UIImage?
    self.nextButton = UIButton(type: .Custom)
    nextButton.frame = CGRectMake(ScreenWidth-100,ScreenHeight-250,60,60)
    nextButton.setTitle("", forState: UIControlState.Normal)
    nextButton.setImage(imageNextButton, forState: .Normal)
    nextButton.contentMode = .ScaleAspectFill
    nextButton.backgroundColor = UIColor.clearColor()
    nextButton.layer.cornerRadius = 5.0
    nextButton.layer.borderWidth = 2.5
    nextButton.layer.borderColor = UIColor.clearColor().CGColor
    nextButton.addTarget(self, action: "nextPressed", forControlEvents: .TouchUpInside)
    nextButton.userInteractionEnabled = true
    gameView.addSubview(nextButton)

func playStageX() { 
       nextButtonWink()
    }
}

func nextButtonWink() {
    UIView.animateWithDuration(1.5, delay: 0, options: [.AllowUserInteraction, .Repeat, .CurveEaseInOut, .Autoreverse],
        animations: …

是否有最新的快速解决方案来使UITextField占位符消失，或者一旦用户单击该字段（而不是当他们开始键入）时将光标移到最前面。我尝试了旧文章中的一些解决方案，并尝试了下面的代码，但似乎没有达到预期的效果。任何帮助，不胜感激。

class LogInViewController: UIViewController, UITextFieldDelegate {

@IBOutlet weak var userTextField: UITextField! 
// the placeholder text is set in IB, with clear Button set to Appears while editing, and clear when editing begins button checked. 

func textFieldDidBeginEditing(textField: UITextField) {
    userTextField.placeholder = nil
    passwordTextField.placeholder = nil
}
}

这为我工作：

添加userTextField.delegate = self以查看是否已加载。//谢谢，我错过了

 func textFieldDidBeginEditing(textField: UITextField) {

    if userTextField.isFirstResponder() == true {
        userTextField.placeholder = nil
    }
}

这似乎已经在swift和objc中被问了几次,但是我看不到swift的正确答案,所以希望这次有人可以帮助我.我创建了一个自定义配件视图按钮,但需要正确的按钮操作:因为"accessoryButtonTapped"是一个无法识别的选择器.

调用tableViewCellDelegate方法需要什么选择器willSelectRowAtIndexPath？

我的代码是:

let cellAudioButton = UIButton(type: .Custom)
cellAudioButton.frame = CGRect(x: 0, y: 0, width: 20, height: 20)
cellAudioButton.addTarget(self, action: "accessoryButtonTapped", forControlEvents: .TouchUpInside) //INCORRECT ACTION:
cellAudioButton.setImage(UIImage(named: "blueSpeaker.png"), forState: .Normal)
cellAudioButton.contentMode = .ScaleAspectFit
cell.accessoryView = cellAudioButton as UIView

提前感谢任何可以提供帮助的人.

我正在使用UIBezierPath arc方法创建一个弧.我想要将圆弧的两端修圆 - 请参阅附图,了解具体要求!circularRect版本中使用的cornerRadius选项不适用于arc方法.任何人都有关于如何实现这一目标的想法？提前致谢.(这与先前提出的问题不同,因为它提供了确切的要求)

 let center = CGPoint(x:bounds.width/2, y: bounds.height/2)
 let radius: CGFloat = max(bounds.width, bounds.height)
 let arcWidth: CGFloat = 10
 let startAngle: CGFloat = 4.6 / 3 * ?
 let endAngle: CGFloat = 4.4 / 3 * ?

 let path = UIBezierPath(arcCenter: center, radius: radius/2 - arcWidth/2, startAngle: startAngle, endAngle: endAngle, clockwise: true)

 path.lineWidth = arcWidth
 // all thats needed to make the ends rounded is
 path.lineCapStyle = .Round
 path.stroke()

我有一个UIViewController我想将背景设置为一个图像.我想在代码中执行此操作IB,因此我可以随后更改图像.

阅读了有关.ScaleAspectFill我的图像的所有提示仍然没有调整大小以适应屏幕.有人可以提供任何建议吗？我的代码是:

override func viewDidLoad() {
    super.viewDidLoad()

    // set the inital backgroundColor
    self.view.backgroundColor = UIColor(patternImage: gameBackgroundOne!)
    self.view.contentMode = UIViewContentMode.ScaleAspectFill //doesnt seem to do anything!
    self.view.clipsToBounds = true // is this needed?
    self.view.center = view.center // is this needed?
}