在 Swift 中将 UILabel 的一部分设为粗体
Make part of a UILabel bold in Swift
我有一个 UILabel 我以编程方式制作为：
var label = UILabel()
然后我为标签声明了一些样式，包括字体，例如：
label.frame = CGRect(x: 20, y: myHeaderView.frame.height / 2, width: 300, height: 30)
label.font = UIFont(name: "Typo GeoSlab Regular Demo", size: 15)
label.textColor = UIColor(hue: 0/360, saturation: 0/100, brightness: 91/100, alpha: 1)
标签的第一部分将始终显示为："Filter:"，然后是字符串的另一部分，例如 "Most popular"
我希望过滤器这个词是粗体的，所以整个事情看起来像：
筛选条件：最受欢迎
我想要创建这种效果的最简单方法。我一直在互联网上搜索如何实现这一点，有很多方法，有些看起来就像代码页。而且大部分似乎都在 Objective-C 中。我希望在 Swift 中得到它:)
我不知道我的思路是否正确，但这就是 NSRange 可以帮助实现的目标吗？提前致谢
更新
我使用一系列 if 语句来更改我的 label 变量。如：
if indexArray == 1 {
label.text = "Filter: Film name"
} else if indexArray == 2 {
label.text = "Filter: Most popular"
} else if indexArray == 3 {
label.text = "Filter: Star rating"
}
您将需要使用 attributedString，它允许您设置字符串等部分的样式。这可以通过两种样式来完成，一种是普通样式，一种是粗体，然后将它们附加在一起：
let boldText = "Filter:"
let attrs = [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 15)]
let attributedString = NSMutableAttributedString(string:boldText, attributes:attrs)
let normalText = "Hi am normal"
let normalString = NSMutableAttributedString(string:normalText)
attributedString.append(normalString)
当您想将其分配给标签时：
label.attributedText = attributedString
您可以使用 NSMutableAttributedString 和 NSAttributedString 创建自定义字符串。下面的函数使给定字符串中的给定 boldString 变为粗体。
Swift 3
func attributedText(withString string: String, boldString: String, font: UIFont) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: string,
attributes: [NSFontAttributeName: font])
let boldFontAttribute: [String: Any] = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: font.pointSize)]
let range = (string as NSString).range(of: boldString)
attributedString.addAttributes(boldFontAttribute, range: range)
return attributedString
}
用法示例
authorLabel.attributedText = attributedText(withString: String(format: "Author : %@", user.name), boldString: "Author", font: authorLabel.font)
Swift 4
func attributedText(withString string: String, boldString: String, font: UIFont) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: string,
attributes: [NSAttributedStringKey.font: font])
let boldFontAttribute: [NSAttributedStringKey: Any] = [NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: font.pointSize)]
let range = (string as NSString).range(of: boldString)
attributedString.addAttributes(boldFontAttribute, range: range)
return attributedString
}
Swift 4.2 和 5
func attributedText(withString string: String, boldString: String, font: UIFont) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: string,
attributes: [NSAttributedString.Key.font: font])
let boldFontAttribute: [NSAttributedString.Key: Any] = [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: font.pointSize)]
let range = (string as NSString).range(of: boldString)
attributedString.addAttributes(boldFontAttribute, range: range)
return attributedString
}
Swift 4个选择：
let attrs = [NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 14)]
let attributedString = NSMutableAttributedString(string: "BOLD TEXT", attributes:attrs)
let normalString = NSMutableAttributedString(string: "normal text")
attributedString.append(normalString)
myLabel.attributedText = attributedString
只是在 Swift 4.0 中分享我自己的 quite-flexible 实现。因为有一些要求，比如我目前的要求，您不仅需要将标签文本的一部分设置为粗体，还需要设置斜体。
import UIKit
extension UILabel {
/** Sets up the label with two different kinds of attributes in its attributed text.
* @params:
* - primaryString: the normal attributed string.
* - secondaryString: the bold or highlighted string.
*/
func setAttributedText(primaryString: String, textColor: UIColor, font: UIFont, secondaryString: String, secondaryTextColor: UIColor, secondaryFont: UIFont) {
let completeString = "\(primaryString) \(secondaryString)"
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center
let completeAttributedString = NSMutableAttributedString(
string: completeString, attributes: [
.font: font,
.foregroundColor: textColor,
.paragraphStyle: paragraphStyle
]
)
let secondStringAttribute: [NSAttributedStringKey: Any] = [
.font: secondaryFont,
.foregroundColor: secondaryTextColor,
.paragraphStyle: paragraphStyle
]
let range = (completeString as NSString).range(of: secondaryString)
completeAttributedString.addAttributes(secondStringAttribute, range: range)
self.attributedText = completeAttributedString
}
}
结果：
Swift 4.2 & 5.0:
首先我们创建一个协议，UILabel、UITextField 和 UITextView 可以采用。
public protocol ChangableFont: AnyObject {
var rangedAttributes: [RangedAttributes] { get }
func getText() -> String?
func set(text: String?)
func getAttributedText() -> NSAttributedString?
func set(attributedText: NSAttributedString?)
func getFont() -> UIFont?
func changeFont(ofText text: String, with font: UIFont)
func changeFont(inRange range: NSRange, with font: UIFont)
func changeTextColor(ofText text: String, with color: UIColor)
func changeTextColor(inRange range: NSRange, with color: UIColor)
func resetFontChanges()
}
我们希望能够对我们的文本添加多个更改，因此我们创建了 rangedAttributes 属性。它是一个自定义结构，包含属性及其应用范围。
public struct RangedAttributes {
public let attributes: [NSAttributedString.Key: Any]
public let range: NSRange
public init(_ attributes: [NSAttributedString.Key: Any], inRange range: NSRange) {
self.attributes = attributes
self.range = range
}
}
还有一个问题就是UILabel它的font属性强而UITextField它的font属性是weak/optional .为了让它们都与我们的 ChangableFont 协议一起工作，我们包含了 getFont() -> UIFont? 方法。这也算作 UITextView 的 text 和 attributedText 属性。这就是为什么我们也为它们实现 getter 和 setter 方法。
extension UILabel: ChangableFont {
public func getText() -> String? {
return text
}
public func set(text: String?) {
self.text = text
}
public func getAttributedText() -> NSAttributedString? {
return attributedText
}
public func set(attributedText: NSAttributedString?) {
self.attributedText = attributedText
}
public func getFont() -> UIFont? {
return font
}
}
extension UITextField: ChangableFont {
public func getText() -> String? {
return text
}
public func set(text: String?) {
self.text = text
}
public func getAttributedText() -> NSAttributedString? {
return attributedText
}
public func set(attributedText: NSAttributedString?) {
self.attributedText = attributedText
}
public func getFont() -> UIFont? {
return font
}
}
extension UITextView: ChangableFont {
public func getText() -> String? {
return text
}
public func set(text: String?) {
self.text = text
}
public func getAttributedText() -> NSAttributedString? {
return attributedText
}
public func set(attributedText: NSAttributedString?) {
self.attributedText = attributedText
}
public func getFont() -> UIFont? {
return font
}
}
现在我们可以继续为 UILabel、UITextField 和 UITextView 创建默认实现，方法是扩展我们的协议。
public extension ChangableFont {
var rangedAttributes: [RangedAttributes] {
guard let attributedText = getAttributedText() else {
return []
}
var rangedAttributes: [RangedAttributes] = []
let fullRange = NSRange(
location: 0,
length: attributedText.string.count
)
attributedText.enumerateAttributes(
in: fullRange,
options: []
) { (attributes, range, stop) in
guard range != fullRange, !attributes.isEmpty else { return }
rangedAttributes.append(RangedAttributes(attributes, inRange: range))
}
return rangedAttributes
}
func changeFont(ofText text: String, with font: UIFont) {
guard let range = (self.getAttributedText()?.string ?? self.getText())?.range(ofText: text) else { return }
changeFont(inRange: range, with: font)
}
func changeFont(inRange range: NSRange, with font: UIFont) {
add(attributes: [.font: font], inRange: range)
}
func changeTextColor(ofText text: String, with color: UIColor) {
guard let range = (self.getAttributedText()?.string ?? self.getText())?.range(ofText: text) else { return }
changeTextColor(inRange: range, with: color)
}
func changeTextColor(inRange range: NSRange, with color: UIColor) {
add(attributes: [.foregroundColor: color], inRange: range)
}
private func add(attributes: [NSAttributedString.Key: Any], inRange range: NSRange) {
guard !attributes.isEmpty else { return }
var rangedAttributes: [RangedAttributes] = self.rangedAttributes
var attributedString: NSMutableAttributedString
if let attributedText = getAttributedText() {
attributedString = NSMutableAttributedString(attributedString: attributedText)
} else if let text = getText() {
attributedString = NSMutableAttributedString(string: text)
} else {
return
}
rangedAttributes.append(RangedAttributes(attributes, inRange: range))
rangedAttributes.forEach { (rangedAttributes) in
attributedString.addAttributes(
rangedAttributes.attributes,
range: rangedAttributes.range
)
}
set(attributedText: attributedString)
}
func resetFontChanges() {
guard let text = getText() else { return }
set(attributedText: NSMutableAttributedString(string: text))
}
}
在默认实现中，我使用了一些辅助方法来获取 substring 的 NSRange。
public extension String {
func range(ofText text: String) -> NSRange {
let fullText = self
let range = (fullText as NSString).range(of: text)
return range
}
}
大功告成！您现在可以更改部分文本的字体和文本颜色。
titleLabel.text = "Welcome"
titleLabel.font = UIFont.systemFont(ofSize: 70, weight: .bold)
titleLabel.textColor = UIColor.black
titleLabel.changeFont(ofText: "lc", with: UIFont.systemFont(ofSize: 60, weight: .light))
titleLabel.changeTextColor(ofText: "el", with: UIColor.blue)
titleLabel.changeTextColor(ofText: "co", with: UIColor.red)
titleLabel.changeTextColor(ofText: "m", with: UIColor.green)
Swift 4.0 解决方案
let font = UIFont.systemFont(ofSize: 14)
func boldSearchResult(searchString: String, resultString: String) -> NSMutableAttributedString {
let attributedString: NSMutableAttributedString = NSMutableAttributedString(string: resultString)
guard let regex = try? NSRegularExpression(pattern: searchString.lowercased(), options: []) else {
return attributedString
}
let range: NSRange = NSMakeRange(0, resultString.count)
regex.enumerateMatches(in: resultString.lowercased(), options: [], range: range) { (textCheckingResult, matchingFlags, stop) in
guard let subRange = textCheckingResult?.range else {
return
}
attributedString.addAttributes([NSAttributedString.Key.font : font], range: subRange)
}
return attributedString
}
如果您愿意，可以直接对 String 进行操作：
extension String {
func withBoldText(text: String, font: UIFont? = nil) -> NSAttributedString {
let _font = font ?? UIFont.systemFont(ofSize: 14, weight: .regular)
let fullString = NSMutableAttributedString(string: self, attributes: [NSAttributedString.Key.font: _font])
let boldFontAttribute: [NSAttributedString.Key: Any] = [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: _font.pointSize)]
let range = (self as NSString).range(of: text)
fullString.addAttributes(boldFontAttribute, range: range)
return fullString
}}
用法：
label.attributeString = "my full string".withBoldText(text: "full")
对于喜欢扩展的人
Swift 5.0
/// will set a regual and a bold text in the same label
public func setRegualAndBoldText(regualText: String,
boldiText: String) {
let attrs = [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: font.pointSize)]
let regularString = NSMutableAttributedString(string: regualText)
let boldiString = NSMutableAttributedString(string: boldiText, attributes:attrs)
regularString.append(boldiString)
attributedText = regularString
}
并使用：
label.setRegualAndBoldText(regualText: "height: ", boldiText: "1.65 :(")
如果您知道要加粗的字符位置值，我创建了一个函数，它接受字符范围和可选字体（如果您只想使用 12 号的标准系统字体，请使用 nil），以及 returns 一个 NSAttributedString ，您可以将其附加到标签作为其属性文本。我想加粗字符串的第 0、10、22-23、30 和 34 个字符，所以我使用了 [[0,0]、[10,10]、[22,23]、[30,30]、[34] ,34]] 用于我的 boldCharactersRanges 值。
用法：
func boldenParts(string: String, boldCharactersRanges: [[Int]], regularFont: UIFont?, boldFont: UIFont?) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: string, attributes: [NSAttributedString.Key.font: regularFont ?? UIFont.systemFont(ofSize: 12)])
let boldFontAttribute: [NSAttributedString.Key: Any] = [NSAttributedString.Key.font: boldFont ?? UIFont.boldSystemFont(ofSize: regularFont?.pointSize ?? UIFont.systemFontSize)]
for range in boldCharactersRanges {
let currentRange = NSRange(location: range[0], length: range[1]-range[0]+1)
attributedString.addAttributes(boldFontAttribute, range: currentRange)
}
return attributedString
}
override func viewDidLoad() {
super.viewDidLoad()
let label = UILabel()
label.frame = CGRect(x: 0, y: 0, width: 180, height: 50)
label.numberOfLines = 0
label.center = view.center
let text = "Under the pillow is a vogue article"
let secretMessage = boldenParts(string: text, boldCharactersRanges: [[0,0], [10,10], [22,23], [30,30], [34,34]], regularFont: UIFont(name: "Avenir", size: 15), boldFont: UIFont(name: "Avenir-Black", size: 15))
label.attributedText = secretMessage
view.addSubview(label)
}
我有一个 UILabel 我以编程方式制作为：
var label = UILabel()
然后我为标签声明了一些样式，包括字体，例如：
label.frame = CGRect(x: 20, y: myHeaderView.frame.height / 2, width: 300, height: 30)
label.font = UIFont(name: "Typo GeoSlab Regular Demo", size: 15)
label.textColor = UIColor(hue: 0/360, saturation: 0/100, brightness: 91/100, alpha: 1)
标签的第一部分将始终显示为："Filter:"，然后是字符串的另一部分，例如 "Most popular"
我希望过滤器这个词是粗体的，所以整个事情看起来像：
筛选条件：最受欢迎
我想要创建这种效果的最简单方法。我一直在互联网上搜索如何实现这一点，有很多方法，有些看起来就像代码页。而且大部分似乎都在 Objective-C 中。我希望在 Swift 中得到它:)
我不知道我的思路是否正确，但这就是 NSRange 可以帮助实现的目标吗？提前致谢
更新
我使用一系列 if 语句来更改我的 label 变量。如：
if indexArray == 1 {
label.text = "Filter: Film name"
} else if indexArray == 2 {
label.text = "Filter: Most popular"
} else if indexArray == 3 {
label.text = "Filter: Star rating"
}
您将需要使用 attributedString，它允许您设置字符串等部分的样式。这可以通过两种样式来完成，一种是普通样式，一种是粗体，然后将它们附加在一起：
let boldText = "Filter:"
let attrs = [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 15)]
let attributedString = NSMutableAttributedString(string:boldText, attributes:attrs)
let normalText = "Hi am normal"
let normalString = NSMutableAttributedString(string:normalText)
attributedString.append(normalString)
当您想将其分配给标签时：
label.attributedText = attributedString
您可以使用 NSMutableAttributedString 和 NSAttributedString 创建自定义字符串。下面的函数使给定字符串中的给定 boldString 变为粗体。
Swift 3
func attributedText(withString string: String, boldString: String, font: UIFont) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: string,
attributes: [NSFontAttributeName: font])
let boldFontAttribute: [String: Any] = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: font.pointSize)]
let range = (string as NSString).range(of: boldString)
attributedString.addAttributes(boldFontAttribute, range: range)
return attributedString
}
用法示例
authorLabel.attributedText = attributedText(withString: String(format: "Author : %@", user.name), boldString: "Author", font: authorLabel.font)
Swift 4
func attributedText(withString string: String, boldString: String, font: UIFont) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: string,
attributes: [NSAttributedStringKey.font: font])
let boldFontAttribute: [NSAttributedStringKey: Any] = [NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: font.pointSize)]
let range = (string as NSString).range(of: boldString)
attributedString.addAttributes(boldFontAttribute, range: range)
return attributedString
}
Swift 4.2 和 5
func attributedText(withString string: String, boldString: String, font: UIFont) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: string,
attributes: [NSAttributedString.Key.font: font])
let boldFontAttribute: [NSAttributedString.Key: Any] = [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: font.pointSize)]
let range = (string as NSString).range(of: boldString)
attributedString.addAttributes(boldFontAttribute, range: range)
return attributedString
}
Swift 4个选择：
let attrs = [NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 14)]
let attributedString = NSMutableAttributedString(string: "BOLD TEXT", attributes:attrs)
let normalString = NSMutableAttributedString(string: "normal text")
attributedString.append(normalString)
myLabel.attributedText = attributedString
只是在 Swift 4.0 中分享我自己的 quite-flexible 实现。因为有一些要求，比如我目前的要求，您不仅需要将标签文本的一部分设置为粗体，还需要设置斜体。
import UIKit
extension UILabel {
/** Sets up the label with two different kinds of attributes in its attributed text.
* @params:
* - primaryString: the normal attributed string.
* - secondaryString: the bold or highlighted string.
*/
func setAttributedText(primaryString: String, textColor: UIColor, font: UIFont, secondaryString: String, secondaryTextColor: UIColor, secondaryFont: UIFont) {
let completeString = "\(primaryString) \(secondaryString)"
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center
let completeAttributedString = NSMutableAttributedString(
string: completeString, attributes: [
.font: font,
.foregroundColor: textColor,
.paragraphStyle: paragraphStyle
]
)
let secondStringAttribute: [NSAttributedStringKey: Any] = [
.font: secondaryFont,
.foregroundColor: secondaryTextColor,
.paragraphStyle: paragraphStyle
]
let range = (completeString as NSString).range(of: secondaryString)
completeAttributedString.addAttributes(secondStringAttribute, range: range)
self.attributedText = completeAttributedString
}
}
结果：
Swift 4.2 & 5.0:
首先我们创建一个协议，UILabel、UITextField 和 UITextView 可以采用。
public protocol ChangableFont: AnyObject {
var rangedAttributes: [RangedAttributes] { get }
func getText() -> String?
func set(text: String?)
func getAttributedText() -> NSAttributedString?
func set(attributedText: NSAttributedString?)
func getFont() -> UIFont?
func changeFont(ofText text: String, with font: UIFont)
func changeFont(inRange range: NSRange, with font: UIFont)
func changeTextColor(ofText text: String, with color: UIColor)
func changeTextColor(inRange range: NSRange, with color: UIColor)
func resetFontChanges()
}
我们希望能够对我们的文本添加多个更改，因此我们创建了 rangedAttributes 属性。它是一个自定义结构，包含属性及其应用范围。
public struct RangedAttributes {
public let attributes: [NSAttributedString.Key: Any]
public let range: NSRange
public init(_ attributes: [NSAttributedString.Key: Any], inRange range: NSRange) {
self.attributes = attributes
self.range = range
}
}
还有一个问题就是UILabel它的font属性强而UITextField它的font属性是weak/optional .为了让它们都与我们的 ChangableFont 协议一起工作，我们包含了 getFont() -> UIFont? 方法。这也算作 UITextView 的 text 和 attributedText 属性。这就是为什么我们也为它们实现 getter 和 setter 方法。
extension UILabel: ChangableFont {
public func getText() -> String? {
return text
}
public func set(text: String?) {
self.text = text
}
public func getAttributedText() -> NSAttributedString? {
return attributedText
}
public func set(attributedText: NSAttributedString?) {
self.attributedText = attributedText
}
public func getFont() -> UIFont? {
return font
}
}
extension UITextField: ChangableFont {
public func getText() -> String? {
return text
}
public func set(text: String?) {
self.text = text
}
public func getAttributedText() -> NSAttributedString? {
return attributedText
}
public func set(attributedText: NSAttributedString?) {
self.attributedText = attributedText
}
public func getFont() -> UIFont? {
return font
}
}
extension UITextView: ChangableFont {
public func getText() -> String? {
return text
}
public func set(text: String?) {
self.text = text
}
public func getAttributedText() -> NSAttributedString? {
return attributedText
}
public func set(attributedText: NSAttributedString?) {
self.attributedText = attributedText
}
public func getFont() -> UIFont? {
return font
}
}
现在我们可以继续为 UILabel、UITextField 和 UITextView 创建默认实现，方法是扩展我们的协议。
public extension ChangableFont {
var rangedAttributes: [RangedAttributes] {
guard let attributedText = getAttributedText() else {
return []
}
var rangedAttributes: [RangedAttributes] = []
let fullRange = NSRange(
location: 0,
length: attributedText.string.count
)
attributedText.enumerateAttributes(
in: fullRange,
options: []
) { (attributes, range, stop) in
guard range != fullRange, !attributes.isEmpty else { return }
rangedAttributes.append(RangedAttributes(attributes, inRange: range))
}
return rangedAttributes
}
func changeFont(ofText text: String, with font: UIFont) {
guard let range = (self.getAttributedText()?.string ?? self.getText())?.range(ofText: text) else { return }
changeFont(inRange: range, with: font)
}
func changeFont(inRange range: NSRange, with font: UIFont) {
add(attributes: [.font: font], inRange: range)
}
func changeTextColor(ofText text: String, with color: UIColor) {
guard let range = (self.getAttributedText()?.string ?? self.getText())?.range(ofText: text) else { return }
changeTextColor(inRange: range, with: color)
}
func changeTextColor(inRange range: NSRange, with color: UIColor) {
add(attributes: [.foregroundColor: color], inRange: range)
}
private func add(attributes: [NSAttributedString.Key: Any], inRange range: NSRange) {
guard !attributes.isEmpty else { return }
var rangedAttributes: [RangedAttributes] = self.rangedAttributes
var attributedString: NSMutableAttributedString
if let attributedText = getAttributedText() {
attributedString = NSMutableAttributedString(attributedString: attributedText)
} else if let text = getText() {
attributedString = NSMutableAttributedString(string: text)
} else {
return
}
rangedAttributes.append(RangedAttributes(attributes, inRange: range))
rangedAttributes.forEach { (rangedAttributes) in
attributedString.addAttributes(
rangedAttributes.attributes,
range: rangedAttributes.range
)
}
set(attributedText: attributedString)
}
func resetFontChanges() {
guard let text = getText() else { return }
set(attributedText: NSMutableAttributedString(string: text))
}
}
在默认实现中，我使用了一些辅助方法来获取 substring 的 NSRange。
public extension String {
func range(ofText text: String) -> NSRange {
let fullText = self
let range = (fullText as NSString).range(of: text)
return range
}
}
大功告成！您现在可以更改部分文本的字体和文本颜色。
titleLabel.text = "Welcome"
titleLabel.font = UIFont.systemFont(ofSize: 70, weight: .bold)
titleLabel.textColor = UIColor.black
titleLabel.changeFont(ofText: "lc", with: UIFont.systemFont(ofSize: 60, weight: .light))
titleLabel.changeTextColor(ofText: "el", with: UIColor.blue)
titleLabel.changeTextColor(ofText: "co", with: UIColor.red)
titleLabel.changeTextColor(ofText: "m", with: UIColor.green)
Swift 4.0 解决方案
let font = UIFont.systemFont(ofSize: 14)
func boldSearchResult(searchString: String, resultString: String) -> NSMutableAttributedString {
let attributedString: NSMutableAttributedString = NSMutableAttributedString(string: resultString)
guard let regex = try? NSRegularExpression(pattern: searchString.lowercased(), options: []) else {
return attributedString
}
let range: NSRange = NSMakeRange(0, resultString.count)
regex.enumerateMatches(in: resultString.lowercased(), options: [], range: range) { (textCheckingResult, matchingFlags, stop) in
guard let subRange = textCheckingResult?.range else {
return
}
attributedString.addAttributes([NSAttributedString.Key.font : font], range: subRange)
}
return attributedString
}
如果您愿意，可以直接对 String 进行操作：
extension String {
func withBoldText(text: String, font: UIFont? = nil) -> NSAttributedString {
let _font = font ?? UIFont.systemFont(ofSize: 14, weight: .regular)
let fullString = NSMutableAttributedString(string: self, attributes: [NSAttributedString.Key.font: _font])
let boldFontAttribute: [NSAttributedString.Key: Any] = [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: _font.pointSize)]
let range = (self as NSString).range(of: text)
fullString.addAttributes(boldFontAttribute, range: range)
return fullString
}}
用法：
label.attributeString = "my full string".withBoldText(text: "full")
对于喜欢扩展的人
Swift 5.0
/// will set a regual and a bold text in the same label
public func setRegualAndBoldText(regualText: String,
boldiText: String) {
let attrs = [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: font.pointSize)]
let regularString = NSMutableAttributedString(string: regualText)
let boldiString = NSMutableAttributedString(string: boldiText, attributes:attrs)
regularString.append(boldiString)
attributedText = regularString
}
并使用：
label.setRegualAndBoldText(regualText: "height: ", boldiText: "1.65 :(")
如果您知道要加粗的字符位置值，我创建了一个函数，它接受字符范围和可选字体（如果您只想使用 12 号的标准系统字体，请使用 nil），以及 returns 一个 NSAttributedString ，您可以将其附加到标签作为其属性文本。我想加粗字符串的第 0、10、22-23、30 和 34 个字符，所以我使用了 [[0,0]、[10,10]、[22,23]、[30,30]、[34] ,34]] 用于我的 boldCharactersRanges 值。
用法：
func boldenParts(string: String, boldCharactersRanges: [[Int]], regularFont: UIFont?, boldFont: UIFont?) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: string, attributes: [NSAttributedString.Key.font: regularFont ?? UIFont.systemFont(ofSize: 12)])
let boldFontAttribute: [NSAttributedString.Key: Any] = [NSAttributedString.Key.font: boldFont ?? UIFont.boldSystemFont(ofSize: regularFont?.pointSize ?? UIFont.systemFontSize)]
for range in boldCharactersRanges {
let currentRange = NSRange(location: range[0], length: range[1]-range[0]+1)
attributedString.addAttributes(boldFontAttribute, range: currentRange)
}
return attributedString
}
override func viewDidLoad() {
super.viewDidLoad()
let label = UILabel()
label.frame = CGRect(x: 0, y: 0, width: 180, height: 50)
label.numberOfLines = 0
label.center = view.center
let text = "Under the pillow is a vogue article"
let secretMessage = boldenParts(string: text, boldCharactersRanges: [[0,0], [10,10], [22,23], [30,30], [34,34]], regularFont: UIFont(name: "Avenir", size: 15), boldFont: UIFont(name: "Avenir-Black", size: 15))
label.attributedText = secretMessage
view.addSubview(label)
}