如何将小数转换为分数 - Swift
我有一个分数计算器，当我计算它时，它会变成十进制。我想把它变成分数。我不知道如何在代码中执行此操作，但我尝试将计算分开，但在此处不起作用的是代码以及我的故事板的屏幕截图 https://www.dropbox.com/s/fmapxaou49zap05/iOS%20Simulator%20Screen%20Shot%20Oct%2015%2C%202014%2C%209.37.43%20PM.png?dl=0 < / p>
//Adding Function
changingSignsLabel.text = "+"
let firstDenomInTextField:Double! = (firstDenominatorTextField.text as NSString).doubleValue
let firstNumInTextField:Double! = (firstNumeratorTextField.text as NSString).doubleValue
let firstWholeInTextField:Double! = (firstWholeNumberTextField.text as NSString).doubleValue
let secondDenomInTextField:Double! = (secondDenominatorTextField.text as NSString).doubleValue
let secondNumInTextField:Double! = (secondNumeratorTextField.text as NSString).doubleValue
let secondWholeInTextField:Double! = (secondWholeNumberTextField.text as NSString).doubleValue
var firstStep = firstDenomInTextField! * firstWholeInTextField! / firstDenomInTextField!
var secondStep = firstStep + firstNumInTextField! / firstDenomInTextField!
var thirdStep = secondDenomInTextField! * secondWholeInTextField! / secondDenomInTextField!
var fourthStep = thirdStep + secondNumInTextField! / secondDenomInTextField!
var calculatedAnswer = (secondStep + fourthStep)
answerLabel.hidden = false
answerLabel.text = "\(calculatedAnswer)"
如果您有任何问题或疑虑，请在下面发表评论
感谢您的帮助
3 个答案:
答案 0 :(得分：6)
为了让它每次都能工作，你想使用Euclidian算法，它在swift中看起来像这样：
func simplify(top:Int, bottom:Int) -> (newTop:Int, newBottom:Int) {
var x = top
var y = bottom
while (y != 0) {
var buffer = y
y = x % y
x = buffer
}
var hcfVal = x
var newTopVal = top/hcfVal
var newBottomVal = bottom/hcfVal
return(newTopVal, newBottomVal)
}
您应该只能将其添加到您的程序中，然后使用以下命令进行调用：
simplify(5,10)
...返回1和2.希望这有助于其他人试图找到这个问题的简单答案。
答案 1 :(得分：2)
更新答案
我给你写了一个演示应用程序：
Swift源代码：
将它放在视图控制器中。
var numeratorField:UITextField?;
var denominatorField:UITextField?;
var equalButton:UIButton?;
var wholeNumberLabel:UILabel?;
var numeratorLabel:UILabel?;
var denominatorLabel:UILabel?;
var dividerLine:UIView?;
var appName:UILabel?;
var instructions:UILabel?;
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
initViews();
initConstraints();
}
// ---------------------------------------------------------------------
// MARK: Interface Setup
// ---------------------------------------------------------------------
func initViews()
{
self.numeratorField = UITextField();
self.numeratorField?.layer.cornerRadius = 5.0;
self.numeratorField?.layer.borderWidth = 1.0;
self.numeratorField?.textAlignment = NSTextAlignment.Center;
self.denominatorField = UITextField();
self.denominatorField?.layer.cornerRadius = 5.0;
self.denominatorField?.layer.borderWidth = 1.0;
self.denominatorField?.textAlignment = NSTextAlignment.Center;
self.equalButton = UIButton();
self.equalButton?.setTitle("=", forState: UIControlState.Normal);
self.equalButton?.addTarget(self, action: "calculateAnswer", forControlEvents: UIControlEvents.TouchUpInside);
self.equalButton?.setTitleColor(UIColor.darkGrayColor(), forState: UIControlState.Normal);
self.equalButton?.layer.cornerRadius = 5.0;
self.equalButton?.backgroundColor = UIColor.lightGrayColor();
self.wholeNumberLabel = UILabel();
self.wholeNumberLabel?.textAlignment = NSTextAlignment.Right;
self.wholeNumberLabel?.font = UIFont(name: "HelveticaNeue", size: 20);
self.numeratorLabel = UILabel();
self.numeratorLabel?.textAlignment = NSTextAlignment.Center;
self.numeratorLabel?.font = UIFont(name: "HelveticaNeue", size: 14);
self.denominatorLabel = UILabel();
self.denominatorLabel?.textAlignment = NSTextAlignment.Center;
self.denominatorLabel?.font = UIFont(name: "HelveticaNeue", size: 14);
self.dividerLine = UIView();
self.dividerLine?.backgroundColor = self.numeratorLabel!.textColor;
self.dividerLine?.alpha = 0;
self.appName = UILabel();
self.appName?.text = "Fraction App";
self.appName?.font = UIFont(name: "HelveticaNeue-Bold", size: 24);
self.appName?.textAlignment = NSTextAlignment.Center;
self.instructions = UILabel();
self.instructions?.textAlignment = NSTextAlignment.Center;
self.instructions?.text = "Enter a value in the numerator and denominator field, then press the equal sign to see the answer";
self.instructions?.numberOfLines = 0;
self.instructions?.lineBreakMode = NSLineBreakMode.ByWordWrapping;
self.view.addSubview(self.numeratorField!);
self.view.addSubview(self.denominatorField!);
self.view.addSubview(self.equalButton!);
self.view.addSubview(self.wholeNumberLabel!);
self.view.addSubview(self.numeratorLabel!);
self.view.addSubview(self.denominatorLabel!);
self.view.addSubview(self.dividerLine!);
self.view.addSubview(self.appName!);
self.view.addSubview(self.instructions!);
}
func initConstraints()
{
self.appName?.setTranslatesAutoresizingMaskIntoConstraints(false);
self.numeratorField?.setTranslatesAutoresizingMaskIntoConstraints(false);
self.denominatorField?.setTranslatesAutoresizingMaskIntoConstraints(false);
self.equalButton?.setTranslatesAutoresizingMaskIntoConstraints(false);
self.wholeNumberLabel?.setTranslatesAutoresizingMaskIntoConstraints(false);
self.numeratorLabel?.setTranslatesAutoresizingMaskIntoConstraints(false);
self.denominatorLabel?.setTranslatesAutoresizingMaskIntoConstraints(false);
self.dividerLine?.setTranslatesAutoresizingMaskIntoConstraints(false);
self.instructions?.setTranslatesAutoresizingMaskIntoConstraints(false);
var views:NSMutableDictionary = NSMutableDictionary();
views.setValue(self.appName, forKey: "appName");
views.setValue(self.numeratorField, forKey: "numeratorField");
views.setValue(self.denominatorField, forKey: "denominatorField");
views.setValue(self.equalButton, forKey: "equalButton");
views.setValue(self.wholeNumberLabel, forKey: "wholeNumberLabel")
views.setValue(self.numeratorLabel, forKey: "numeratorLabel");
views.setValue(self.denominatorLabel, forKey: "denominatorLabel");
views.setValue(self.dividerLine, forKey: "dividerLine");
views.setValue(self.instructions, forKey: "instructions");
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[appName]|", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-50-[appName]", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-20-[instructions]-20-|", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[instructions]-100-|", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-35-[numeratorField(75)]-10-[denominatorField(==numeratorField)]-10-[equalButton]-10-[wholeNumberLabel(>=20)]-2-[dividerLine(15)]", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[numeratorField(50)]", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[denominatorField(==numeratorField)]", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[equalButton(==numeratorField)]", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[wholeNumberLabel(==numeratorField)]", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[numeratorLabel]", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[denominatorLabel]", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[dividerLine(1)]", options: nil, metrics: nil, views: views));
self.view.addConstraint(NSLayoutConstraint(item: self.numeratorLabel!, attribute: NSLayoutAttribute.Left, relatedBy: NSLayoutRelation.Equal, toItem: self.wholeNumberLabel, attribute: NSLayoutAttribute.Right, multiplier: 1.0, constant: 0.0));
self.view.addConstraint(NSLayoutConstraint(item: self.denominatorLabel!, attribute: NSLayoutAttribute.Left, relatedBy: NSLayoutRelation.Equal, toItem: self.wholeNumberLabel, attribute: NSLayoutAttribute.Right, multiplier: 1.0, constant: 0.0));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:[numeratorLabel(==wholeNumberLabel)]", options: nil, metrics: nil, views: views));
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:[denominatorLabel(==wholeNumberLabel)]", options: nil, metrics: nil, views: views));
self.view.addConstraint(NSLayoutConstraint(item: self.numeratorField!, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.CenterY, multiplier: 1.0, constant: 0.0));
self.view.addConstraint(NSLayoutConstraint(item: self.denominatorField!, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.CenterY, multiplier: 1.0, constant: 0.0));
self.view.addConstraint(NSLayoutConstraint(item: self.equalButton!, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.CenterY, multiplier: 1.0, constant: 0.0));
self.view.addConstraint(NSLayoutConstraint(item: self.wholeNumberLabel!, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.CenterY, multiplier: 1.0, constant: 0.0));
self.view.addConstraint(NSLayoutConstraint(item: self.dividerLine!, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.CenterY, multiplier: 1.0, constant: 0.0));
self.view.addConstraint(NSLayoutConstraint(item: self.numeratorLabel!, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: self.wholeNumberLabel, attribute: NSLayoutAttribute.CenterY, multiplier: 1.0, constant: 0.0));
self.view.addConstraint(NSLayoutConstraint(item: self.denominatorLabel!, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: self.wholeNumberLabel, attribute: NSLayoutAttribute.CenterY, multiplier: 1.0, constant: 0.0));
}
func getLowestCommonDenominator(Numerator numerator:Int, Denominator denominator:Int) -> Int
{
var finalDenominator = denominator;
//println("\(numerator) / \(finalDenominator) = \(numerator % finalDenominator)");
if(numerator % 2 == 0 && finalDenominator % 2 == 0) // even number
{
return self.getLowestCommonDenominator(Numerator: numerator / 2.0, Denominator: finalDenominator / 2.0);
}
else if(numerator % 3 == 0 && finalDenominator % 3 == 0) // odd number
{
return self.getLowestCommonDenominator(Numerator: numerator / 3.0, Denominator: finalDenominator / 3.0);
}
else // prime number, always have a remainder
{
//println("lowest common denominator = \(finalDenominator)");
return finalDenominator;
}
}
func calculateAnswer()
{
// prevent division by zero
if(self.denominatorField?.text == "0")
{
var alert:UIAlertView = UIAlertView(title: "Division By Zero", message: "Divide by zero yields undefined value", delegate: self, cancelButtonTitle: "OK");
alert.show();
return;
}
// clear previous values;
self.wholeNumberLabel?.text = "";
self.numeratorLabel?.text = "";
self.denominatorLabel?.text = "";
var numeratorString:NSString = self.numeratorField!.text;
var denominatorString:NSString = self.denominatorField!.text;
if (numeratorString.length == 0 || denominatorString.length == 0)
{
//var alert:UIAlertView = UIAlertView(title: "Input Missing", message: "Enter a value for numerator and denominator then press the equal sign to get the answer", delegate: nil, cancelButtonTitle: "OK", otherButtonTitles: nil, nil);
var alert:UIAlertView = UIAlertView(title: "Input Missing", message: "Enter a value for numerator and denominator then press the equal sign to get the answer", delegate: nil, cancelButtonTitle: "OK");
alert.show();
}
else
{
var shouldShowWholeParts:Bool = false;
var shouldShowFractionParts:Bool = false;
var numerator:Int = self.numeratorField!.text.toInt()!;
var denominator:Int = self.denominatorField!.text.toInt()!;
var finalNumerator = numerator;
var finalDenominator = self.getLowestCommonDenominator(Numerator: numerator, Denominator: denominator);
if(finalDenominator < denominator)
{
denominator = finalDenominator;
numerator = numerator / finalDenominator;
}
var wholeNumbers:Int = numerator / denominator;
var remainder:Int = numerator % denominator;
//println("wholeNumbers = \(wholeNumbers), remainder = \(remainder)");
//println("\(denominator) % \(remainder) = \(denominator % remainder)");
if(wholeNumbers != 0)
{
shouldShowWholeParts = true;
}
else
{
shouldShowWholeParts = false;
}
if(remainder > 0)
{
// see if we can simply the fraction part as well
if(denominator % remainder == 0) // no remainder means remainder can be simplified further
{
finalDenominator = denominator / remainder;
finalNumerator = remainder / remainder;
}
else
{
finalNumerator = remainder;
finalDenominator = denominator;
}
shouldShowFractionParts = true;
}
else
{
shouldShowFractionParts = false;
}
var answer:NSString?;
if(wholeNumbers > 0 && remainder > 0)
{
answer = NSString(format: "\(wholeNumbers) \(finalNumerator)/\(finalDenominator)");
// prints out whole number and fraction parts
//println("Simplified fraction of \(numerator)/\(denominator) = \(wholeNumbers) \(finalNumerator)/\(finalDenominator)");
}
else if (wholeNumbers > 0 && remainder == 0)
{
answer = NSString(format: "\(wholeNumbers)");
// prints out whole number only
//println("Simplified fraction of \(numerator)/\(denominator) = \(wholeNumbers)");
}
else
{
answer = NSString(format: "\(finalNumerator)/\(finalDenominator)");
// prints out fraction part only
//println("Simplified fraction of \(numerator)/\(denominator) = \(finalNumerator)/\(finalDenominator)");
}
if(shouldShowWholeParts)
{
self.wholeNumberLabel?.text = NSString(format: "\(wholeNumbers)");
}
if(shouldShowFractionParts)
{
self.numeratorLabel?.text = NSString(format: "\(finalNumerator)");
self.denominatorLabel?.text = NSString(format: "\(finalDenominator)");
self.dividerLine?.alpha = 1;
}
else
{
self.dividerLine?.alpha = 0;
}
}
}
原始答案
这是你要找的吗？
结果：
Simplified fraction of 7/8 = 7/8
Simplified fraction of 12/8 = 1 1/2
Simplified fraction of 5/16 = 5/16
Simplified fraction of 342/23 = 14 20/23
Simplified fraction of 129/72 = 1 57/72
源代码：
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
printSimplifiedFraction(Numerator: 7, Denominator: 8);
printSimplifiedFraction(Numerator: 12, Denominator: 8);
printSimplifiedFraction(Numerator: 5, Denominator: 16);
printSimplifiedFraction(Numerator: 342, Denominator: 23);
printSimplifiedFraction(Numerator: 129, Denominator: 72);
}
func printSimplifiedFraction(Numerator numerator: Int, Denominator denominator:Int)
{
var finalNumerator = numerator;
var finalDenominator = denominator;
var wholeNumbers:Int = numerator / denominator;
var remainder:Int = numerator % denominator;
//println("wholeNumbers = \(wholeNumbers), remainder = \(remainder)");
//println("\(denominator) % \(remainder) = \(denominator % remainder)");
if(remainder > 0)
{
// see if we can simply the fraction part as well
if(denominator % remainder == 0) // no remainder means remainder can be simplified further
{
finalDenominator = denominator / remainder;
finalNumerator = remainder / remainder;
}
else
{
finalNumerator = remainder;
finalDenominator = denominator;
}
}
if(wholeNumbers > 0 && remainder > 0)
{
// prints out whole number and fraction parts
println("Simplified fraction of \(numerator)/\(denominator) = \(wholeNumbers) \(finalNumerator)/\(finalDenominator)");
}
else if (wholeNumbers > 0 && remainder == 0)
{
// prints out whole number only
println("Simplified fraction of \(numerator)/\(denominator) = \(wholeNumbers)");
}
else
{
// prints out fraction part only
println("Simplified fraction of \(numerator)/\(denominator) = \(finalNumerator)/\(finalDenominator)");
}
}
答案 2 :(得分：1)
不幸的是，没有框架可以导入以在swift或Xcode中显示分数。我建议使用您在故事板中使用的相同方法：有两个UILabelView，一个在彼此之上，在它们之间有一条线。
不是计算小数，而是使用基本数学来找到分子和分母，并将它们显示在UILabelView的顶部和底部。
此方法需要在基础级别更改您的程序，但它会起作用。
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