调整标签大小以适应值

Question

我试图调整标签大小以适应文字数量，但发布的答案here需要更多解释。

对我来说，我有三个标签：货币，整数金额，双金额：

我有三个标签，因为货币和双金额的风格都不同于整数金额。如果我以错误的方式行事，请纠正我，因为我不能只为这三个人制作一个标签。

这三个人都有top-right

的自动调整大小

最终我必须删除静态值，但是当我应用下面的代码时，注意到有效：

viewDidLoad（）或viewDidAppear（）：

integerAmountLabel.sizeToFit()

integerAmountLabel.text = "1"
// or integerAmountLabel = "280,000"

期望：£1.00或£280,000.00。我得到了什么：£1 .00或£ 1.00

Answer 1

正如Aman Gupta所说，使用属性字符串。这是一个解释如何操作的游乐场代码：

import UIKit
import PlaygroundSupport

var str = "Hello, playground"

let view = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 300))
PlaygroundPage.current.liveView = view

// set up view hierarchy
view.backgroundColor = .blue
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(label)
view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[label]-|", options: NSLayoutFormatOptions(rawValue:0), metrics: nil, views: ["label": label]))
view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[label]-|", options: NSLayoutFormatOptions(rawValue:0), metrics: nil, views: ["label": label]))

// set up atributes
let currencyAttributes = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 20), NSForegroundColorAttributeName:  UIColor.white]
let integerAmountAttributes = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 30), NSForegroundColorAttributeName: UIColor.white]
let decimalAmountAttributes = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 16), NSForegroundColorAttributeName: UIColor(white: 1, alpha: 0.7)]


// set up formatter
let formatter = NumberFormatter()
formatter.numberStyle = NumberFormatter.Style.currency
formatter.locale = Locale(identifier: "en_GB")

let amount = 8001.9
let text = formatter.string(from: NSNumber(value: amount))!
let nsText = text as NSString

// calculate ranges
let currencyRange = NSRange(location: 0, length: 1)
let decimalPointRange = nsText.range(of: ".")
var integerAmountLocation = currencyRange.location + currencyRange.length
var integerAmountLength = decimalPointRange.location - integerAmountLocation
var integerAmountRange = NSRange(location: integerAmountLocation, length: integerAmountLength)

// configure attributed string
var attributedText = NSMutableAttributedString(string: text, attributes: decimalAmountAttributes)
attributedText.setAttributes(currencyAttributes, range: currencyRange)
attributedText.setAttributes(integerAmountAttributes, range: integerAmountRange)

label.attributedText = attributedText

你可以在这里找到整个游乐场：source

Answer 2

您可以使用单个标签，这将解决您的所有问题，也不必妥协您的标签样式。这可以通过使用 NSAttributedString 来实现。下面显示了一个示例，您可以参考该输出。

(file 100abc\n 150100\n 200def)