我想在iOS9+中使用不可编辑的UITextView嵌入这样的文本:
只需点击此处注册
我可以创建一个函数来操作文本,但是否有更简单的方法?
我发现可以使用NSTextCheckingTypeLink,因此在Interface Builder中使文本可点击而没有“点击此处”部分很简单:
如果相关的话,我正在使用Xcode 8和Swift 3。
我想在iOS9+中使用不可编辑的UITextView嵌入这样的文本:
只需点击此处注册
我可以创建一个函数来操作文本,但是否有更简单的方法?
我发现可以使用NSTextCheckingTypeLink,因此在Interface Builder中使文本可点击而没有“点击此处”部分很简单:
如果相关的话,我正在使用Xcode 8和Swift 3。
设置 isEditable = false
,否则当用户点击它时,文本视图将进入文本编辑模式。
let attributedString = NSMutableAttributedString(string: "Just click here to register")
let url = URL(string: "https://www.apple.com")!
// Set the 'click here' substring to be the link
attributedString.setAttributes([.link: url], range: NSMakeRange(5, 10))
self.textView.attributedText = attributedString
self.textView.isUserInteractionEnabled = true
self.textView.isEditable = false
// Set how links should appear: blue and underlined
self.textView.linkTextAttributes = [
.foregroundColor: UIColor.blue,
.underlineStyle: NSUnderlineStyle.single.rawValue
]
如果您想使用多个超链接,您可以在Swift 5中使用此替代方法。
extension UITextView {
func addHyperLinksToText(originalText: String, hyperLinks: [String: String]) {
let style = NSMutableParagraphStyle()
style.alignment = .left
let attributedOriginalText = NSMutableAttributedString(string: originalText)
for (hyperLink, urlString) in hyperLinks {
let linkRange = attributedOriginalText.mutableString.range(of: hyperLink)
let fullRange = NSRange(location: 0, length: attributedOriginalText.length)
attributedOriginalText.addAttribute(NSAttributedString.Key.link, value: urlString, range: linkRange)
attributedOriginalText.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: fullRange)
attributedOriginalText.addAttribute(NSAttributedString.Key.font, value: YourFont, range: fullRange)
}
self.linkTextAttributes = [
NSAttributedString.Key.foregroundColor: YourColor,
NSAttributedString.Key.underlineStyle: NSUnderlineStyle.single.rawValue,
]
self.attributedText = attributedOriginalText
}
}
用法:
yourTextView.addHyperLinksToText(originalText: "Testing hyperlinks here and there", hyperLinks: ["here": "someUrl1", "there": "someUrl2"])
使用扩展的Swift 3相同解决方案:
A. 添加扩展 -
extension UITextView {
func hyperLink(originalText: String, hyperLink: String, urlString: String) {
let style = NSMutableParagraphStyle()
style.alignment = .center
let attributedOriginalText = NSMutableAttributedString(string: originalText)
let linkRange = attributedOriginalText.mutableString.range(of: hyperLink)
let fullRange = NSMakeRange(0, attributedOriginalText.length)
attributedOriginalText.addAttribute(NSLinkAttributeName, value: urlString, range: linkRange)
attributedOriginalText.addAttribute(NSParagraphStyleAttributeName, value: style, range: fullRange)
attributedOriginalText.addAttribute(NSFontAttributeName, value: UIFont.systemFont(ofSize: 10), range: fullRange)
self.linkTextAttributes = [
NSForegroundColorAttributeName: UIConfig.primaryColour,
NSUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue,
]
self.attributedText = attributedOriginalText
}
}
B. 添加链接 URL - let linkUrl = "https://www.my_website.com"
C. 在您的 ViewController 中实现 UITextViewDelegate
,如下所示 -
class MyViewController: UIViewController, UITextViewDelegate {
}
添加委托方法以处理点击事件 -
func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
if (URL.absoluteString == linkUrl) {
UIApplication.shared.openURL(URL)
}
return false
}
}
E. 最后,在属性检查器下,确保以下事项适用于您的 UITextView
:
使用 -
textView.hyperLink(originalText: "To find out more please visit our website", hyperLink: "website", urlString: linkUrl)
祝福并愉快地编码!
textView.delegate = self
。 - carrotzoeSwift 5 这是基于Tejas的答案,由于两个类中的一些项目已被弃用,因此需要更新。
extension UITextView {
func hyperLink(originalText: String, hyperLink: String, urlString: String) {
let style = NSMutableParagraphStyle()
style.alignment = .left
let attributedOriginalText = NSMutableAttributedString(string: originalText)
let linkRange = attributedOriginalText.mutableString.range(of: hyperLink)
let fullRange = NSMakeRange(0, attributedOriginalText.length)
attributedOriginalText.addAttribute(NSAttributedString.Key.link, value: urlString, range: linkRange)
attributedOriginalText.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: fullRange)
attributedOriginalText.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.blue, range: fullRange)
attributedOriginalText.addAttribute(NSAttributedString.Key.font, value: UIFont.systemFont(ofSize: 10), range: fullRange)
self.linkTextAttributes = [
kCTForegroundColorAttributeName: UIColor.blue,
kCTUnderlineStyleAttributeName: NSUnderlineStyle.single.rawValue,
] as [NSAttributedString.Key : Any]
self.attributedText = attributedOriginalText
}
不要忘记将UITextViewDelegate添加到您的视图控制器中,并设置您的链接网址let linkUrl = "https://example.com"。
func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
if (URL.absoluteString == linkUrl) {
UIApplication.shared.open(URL) { (Bool) in
}
}
return false
}
使用方式不变:
textView.hyperLink(originalText: "To find out more please visit our website", hyperLink: "website", urlString: linkUrl)
Swift 4代码。 也许只有我需要在一条消息中设置多个链接并将单词着色。我创建了一个AttribTextHolder类来累积关于文本的所有信息并轻松地在对象之间传递它,以将文本设置到控制器深处的UITextView中。
class AttribTextHolder {
enum AttrType {
case link
case color
}
let originalText: String
var attributes: [(text: String, type: AttrType, value: Any)]
init(text: String, attrs: [(text: String, type: AttrType, value: Any)] = [])
{
originalText = text
attributes = attrs
}
func addAttr(_ attr: (text: String, type: AttrType, value: Any)) -> AttribTextHolder {
attributes.append(attr)
return self
}
func setTo(textView: UITextView)
{
let style = NSMutableParagraphStyle()
style.alignment = .left
let attributedOriginalText = NSMutableAttributedString(string: originalText)
for item in attributes {
let arange = attributedOriginalText.mutableString.range(of: item.text)
switch item.type {
case .link:
attributedOriginalText.addAttribute(NSAttributedString.Key.link, value: item.value, range: arange)
case .color:
var color = UIColor.black
if let c = item.value as? UIColor { color = c }
else if let s = item.value as? String { color = s.color() }
attributedOriginalText.addAttribute(NSAttributedString.Key.foregroundColor, value: color, range: arange)
default:
break
}
}
let fullRange = NSMakeRange(0, attributedOriginalText.length)
attributedOriginalText.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: fullRange)
textView.linkTextAttributes = [
kCTForegroundColorAttributeName: UIColor.blue,
kCTUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue,
] as [String : Any]
textView.attributedText = attributedOriginalText
}
}
使用方法如下:
let txt = AttribTextHolder(text: "To find out more visit our website or email us your questions")
.addAttr((text: "our website", type: .link, "http://example.com"))
.addAttr((text: "our website", type: .color, "#33BB22"))
.addAttr((text: "email us", type: .link, "mailto:us@example.com"))
.addAttr((text: "email us", type: .color, UIColor.red))
....
....
txt.setTo(textView: myUITextView)
在这段代码中,我使用简单的字符串扩展将字符串十六进制值转换为UIColor对象。
extension String {
/// Converts string color (ex: #23FF33) into UIColor
func color() -> UIColor {
let hex = self.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
var int = UInt32()
Scanner(string: hex).scanHexInt32(&int)
let a, r, g, b: UInt32
switch hex.characters.count {
case 3: // RGB (12-bit)
(a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
case 6: // RGB (24-bit)
(a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
case 8: // ARGB (32-bit)
(a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
default:
(a, r, g, b) = (255, 0, 0, 0)
}
return UIColor(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
}
}
使用 Swift >= 4:
let descriptionText = NSMutableAttributedString(string:"To learn more, check out our ", attributes: [:])
let linkText = NSMutableAttributedString(string: "Privacy Policy and Terms of Use", attributes: [NSAttributedString.Key.link: URL(string: example.com)!])
descriptionText.append(linkText)
使用扩展实现的适用于Swift 4的相同解决方案:
extension UITextView {
func hyperLink(originalText: String, hyperLink: String, urlString: String) {
let style = NSMutableParagraphStyle()
style.alignment = .left
let attributedOriginalText = NSMutableAttributedString(string: originalText)
let linkRange = attributedOriginalText.mutableString.range(of: hyperLink)
let fullRange = NSMakeRange(0, attributedOriginalText.length)
attributedOriginalText.addAttribute(NSAttributedStringKey.link, value: urlString, range: linkRange)
attributedOriginalText.addAttribute(NSAttributedStringKey.paragraphStyle, value: style, range: fullRange)
attributedOriginalText.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.blue, range: fullRange)
attributedOriginalText.addAttribute(NSAttributedStringKey.font, value: UIFont.systemFont(ofSize: 10), range: fullRange)
self.linkTextAttributes = [
kCTForegroundColorAttributeName: UIColor.blue,
kCTUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue,
] as [String : Any]
self.attributedText = attributedOriginalText
}
}
SWIFT 5和多个链接
import UIKit
public extension UITextView {
func hyperLink(originalText: String, linkTextsAndTypes: [String: String]) {
let style = NSMutableParagraphStyle()
style.alignment = .left
let attributedOriginalText = NSMutableAttributedString(string: originalText)
for linkTextAndType in linkTextsAndTypes {
let linkRange = attributedOriginalText.mutableString.range(of: linkTextAndType.key)
let fullRange = NSRange(location: 0, length: attributedOriginalText.length)
attributedOriginalText.addAttribute(NSAttributedString.Key.link, value: linkTextAndType.value, range: linkRange)
attributedOriginalText.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: fullRange)
attributedOriginalText.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.blue, range: fullRange)
attributedOriginalText.addAttribute(NSAttributedString.Key.font, value: UIFont.systemFont(ofSize: 10), range: fullRange)
}
self.linkTextAttributes = [
kCTForegroundColorAttributeName: UIColor.blue,
kCTUnderlineStyleAttributeName: NSUnderlineStyle.single.rawValue
] as [NSAttributedString.Key: Any]
self.attributedText = attributedOriginalText
}
}
而在你的 viewController 中的使用:
@IBOutlet weak var termsHyperlinkTextView: UITextView! {
didSet {
termsHyperlinkTextView.delegate = self
termsHyperlinkTextView.hyperLink(originalText: "Check out terms & conditions or our privacy policy",
linkTextsAndTypes: ["terms & conditions": LinkType.termsAndConditions.rawValue,
"privacy policy": LinkType.privacyPolicy.rawValue])
}
}
enum LinkType: String {
case termsAndConditions
case privacyPolicy
}
// MARK: - UITextViewDelegate
extension ViewController: UITextViewDelegate {
func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
if let linkType = LinkType(rawValue: URL.absoluteString) {
// TODO: handle linktype here with switch or similar.
}
return false
}
}
var termsConditionsTextView: UITextView = {
let view = UITextView()
view.backgroundColor = .clear
view.textAlignment = .left
let firstTitleString = "By registering for THIS_APP I agree with the "
let secondTitleString = "Terms & Conditions"
let finishTitleString = firstTitleString + secondTitleString
let attributedString = NSMutableAttributedString(string: finishTitleString)
attributedString.addAttribute(.link, value: "https://stackoverflow.com", range: NSRange(location: firstTitleString.count, length: secondTitleString.count))
view.attributedText = attributedString
view.textContainerInset = .zero
view.linkTextAttributes = [
.foregroundColor: UIColor.blue,
.underlineStyle: NSUnderlineStyle.single.isEmpty
]
view.font = view.font = UIFont(name: "YOUR_FONT_NAME", size: 16)
view.textColor = UIColor.black
return view }()
func addLink(forString string : NSMutableAttributedString
,baseURL : String
,tag : String){
let array = string.string.replacingOccurrences(of: "\n", with: " ").components(separatedBy: " ")
let filterArray = array.filter { (string) -> Bool in
return string.contains(tag)
}
for element in filterArray {
let removedHashtag = element.replacingOccurrences(of: tag, with: "")
let url = baseURL + removedHashtag
let range = NSString.init(string: (string.string)).range(of: element)
string.addAttributes([NSAttributedStringKey.link : url.replacingOccurrences(of: " ", with: "")], range: range)
}
}