奇怪的@IBAction 冲突或错误?(迅速) [英] Strange @IBAction conflict or bug? (Swift)

问题描述

所以我为我的简单 iOS 应用程序获得了这段代码.当我按下 touchPressed 按钮时，该按钮应该在屏幕上获得一个新的随机位置，并且 labelScore 应该使用按钮触摸次数更新自身.我的一个朋友在 Objective-C 中尝试了这个，并且它有效.

So I got this code for my simple iOS app. When I press the touchPressed button, the button should get a new random location on the screen and the labelScore should update itself with the number of button touches. A friend of mine tried this in Objective-C and it works.

问题是:我在 touchPressed 中有 newScore() 并且按钮没有获得新位置.如果我评论 newScore()，则随机位置操作有效.

The problem is: I have the newScore() in touchedPressed and the button doesn't get a new location. If I comment newScore(), the random location action works.

提前致谢.

//  ViewController.swift


import UIKit
import SpriteKit

class ViewController: UIViewController {

@IBOutlet var backgroundImage: UIImageView!

@IBOutlet var scoreLabel: UILabel!



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.
}





// Initial score
var score:Int  = 0



// Update the actual score with the one matching th number of touches
func newScore() { 
    score = score + 1
    scoreLabel.text = "SCORE: \(score)"
}



// Get the random height for the button (with limits)
func randomButtonHeight(min: Float, max:Float) -> Float {
    return min + Float(arc4random_uniform(UInt32((max-90) - min + 1)))



}

@IBAction func touchPressed(button: UIButton) {



    // Find the button's width and height
    var buttonWidth = button.frame.width
    var buttonHeight = button.frame.height

    // Find the width and height of the enclosing view
    var viewWidth = button.superview!.bounds.width
    var viewHeight = button.superview!.bounds.height


    // Compute width and height of the area to contain the button's center
    var xwidth = viewWidth - buttonWidth
    var yheight = viewHeight - buttonHeight

    // Generate a random x and y offset
    var xoffset = CGFloat(arc4random_uniform(UInt32(xwidth)))
    var yoffset = CGFloat(self.randomButtonHeight(100, max: Float(viewHeight)))

    // Offset the button's center by the random offsets.
    button.center.x = xoffset + buttonWidth / 2
    button.center.y = yoffset + buttonHeight / 2


    newScore() // this works but the action above this doesn't and if I comment this line, the action above works.

}



}

推荐答案

既然@matt 已经确定了问题，我还有一个关于如何处理的建议:

Now that @matt has identified the problem, I have another suggestion about how to handle it:

1) 向您的 ViewController 添加两个新变量:

1) Add two new vars to your ViewController:

var newButtonX: CGFloat?
var newButtonY: CGFloat?

2) 在更新按钮位置时在 touchPressed() 中设置这些.

2) Set these in touchPressed() when updating the button's location.

// Offset the button's center by the random offsets.
newButtonX = xoffset + buttonWidth / 2
newButtonY = yoffset + buttonHeight / 2
button.center.x = newButtonX!
button.center.y = newButtonY!

3) 将按钮的 IBOutlet 添加到您的 ViewController:

3) Add an IBOutlet for the button to your ViewController:

@IBOutlet weak var button: UIButton!

并在 Interface Builder 中连接起来.

and wire it up in Interface Builder.

4) 然后像这样覆盖 viewDidLayoutSubviews:

4) Then override viewDidLayoutSubviews like so:

override func viewDidLayoutSubviews() {
    if let buttonX = newButtonX {
        button.center.x = buttonX
    }
    if let buttonY = newButtonY {
        button.center.y = buttonY
    }
}

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