arrays - 将输入字段与数组进行比较

Question

我正在做一个应用程序，用户可以猜测图像中的名称并检查它，我能够看到将图像的名称放入数组中并能够看到它，但我需要将输入字符串与数组

我已经尝试使用 if(inputfield == images[i]){返回“正确”否则{ false当我输入Apple时，答案给我错误

let images: [String] =["apple","ball","cat","dog","elephant","frog","house","igloo","jar","kite","leaf","monkey","nose","orange","plane","queen","rope","sun","tub","goat"]
var i : Int = 1
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    guessInput.delegate = self
    imageView.image = UIImage(named: images[0])
}

@IBAction func nextButton(_ sender: UIButton) {// Able to show images
   if(i+1 > images.count){
       i = 0
    }
    imageView.image = UIImage(named: images[i])
    i += 1
    checkLabel.text = ""
    guessInput.text = ""
}
@IBAction func checkButton(_ sender: UIButton) {// Compare input with Array
    let tr = String(guessInput.text!)
    if(images[i] ==  tr){
        checkLabel.text = "Correct"
    }
    else{
        checkLabel.text = "false"
    }
}

}

当我输入是苹果时，我预计会“正确”，但当我按下检查按钮时，它显示错误

Answer 1

您可以比较字符串caseInsensitive并从字符串创建字符串(String(guessInput.text!))是多余的。

@IBAction func checkButton(_ sender: UIButton) {// Compare input with Array
    if images[i].compare(guessInput.text!, options: .caseInsensitive) == .orderedSame {
        checkLabel.text = "Correct"
    } else {
        checkLabel.text = "False"
    }
}

顺便说一句，编译器会提示表达式 =["apple" 中缺少空格，并且不会注释编译器可以推断的类型。

let images = ["apple",...
var i = 0 // array indices start with 0

你可以替换

if(i+1 > images.count){
   i = 0
}
imageView.image = UIImage(named: images[i])
i += 1

与

i = (i + 1) % images.count
imageView.image = UIImage(named: images[i])

% 运算符扭曲索引

<小时/>

最后，这是 Swift:if 表达式周围没有括号。

编辑:

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