如何使用Swift在XCode上单击按钮时，将得分提高一点

Question

对于简单的问题，我对IOS开发人员来说很新颖。我想要做的是使UILabel设置为0，每次点击一个按钮时都会加1。这里是在ViewController.swift上给出的默认代码，并且我已经为按钮的标签和动作创建了一个Outlet。

import UIKit 

class ViewController: UIViewController { 
@IBOutlet var score: UILabel! 

@IBAction func button(sender: UIButton) { 


} 

override func viewDidLoad() { 
    super.viewDidLoad() 

} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 

} 


} 

Answer 1

CHANGE LABEL NAME TO BE MORE DESCRIPTIVE 
CREATE SCORE VARIABLE AND START IT AT 0 SO YOU HAVE A SCORE TO PRESENT FROM THE START 
MAKE IT BEAUTIFUL 



import UIKit 

class ViewController: UIViewController { 
@IBOutlet var scoreLabel: UILabel! 
private var score = 0 

@IBAction func button(sender: UIButton) { 
    score += 1 
    scoreLabel.text = "\(score)" 
} 

override func viewDidLoad() { 
    super.viewDidLoad() 
     scoreLabel.text = "\(score)" 
     scoreLabel.backgroundColor = UIColor.pinkColor() 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 

} 


} 

Answer 2

您需要一个变量来计数。像var counter = 0和在功能按钮，你把counter +=1和score.text = "\(counter)"。我没有尝试，现在在Xcode的，但据我所知，应该工作

Answer 3

这可能是做这件事的一种方法：

@IBOutlet weak var scoreLabel: UILabel! 
@IBAction func updateScore(sender: AnyObject) { 
    //Check if String can be parsed to integer 
    if let score = NSNumberFormatter().numberFromString(scoreLabel.text!) { 
     var myInt = score.integerValue 
     myInt = myInt + 1 
     scoreLabel.text = "\(myInt)" 
    } else { 
     scoreLabel.text = "0" 
    } 
}