问题
With a non-editable UITextView, I would like to embed text like this in iOS9+:
Just click here to register
I can create a function and manipulate the text but is there a simpler way?
I see that I can use NSTextCheckingTypeLink so getting the text clickable without the \'click here\' part is straightforward in Interface Builder:
Just http://example.com to register
I\'m using Xcode 8 and Swift 3 if that\'s relevant.
回答1:
Set isEditable = false or the text view will go into text-editing mode when user taps on it.
Swift 4 and later
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
]
回答2:
The same solution for Swift 3 using extensions :
A. Add extension -
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. Add link url - let linkUrl = "https://www.my_website.com"
C. Implement UITextViewDelegate in your ViewController like this -
class MyViewController: UIViewController, UITextViewDelegate {
}
D. Add delegate method to handle tap events -
func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
if (URL.absoluteString == linkUrl) {
UIApplication.shared.openURL(URL)
}
return false
}
}
E. And finally, things to make sure for your UITextView under attribute inspector -
- Behaviour - Editable is turned OFF & Selectable is turned ON.
- Data Detectors - Link is turned ON.
Usage -
textView.hyperLink(originalText: "To find out more please visit our website", hyperLink: "website", urlString: linkUrl)
Cheers & happy coding!
回答3:
The same solution for Swift 4 using extensions:
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
}
}
回答4:
Swift 4 code. May be I'm the only one who needs to set several links and color the words in one message. I created an AttribTextHolder class to accumulate all information about text inside this holder and easily pass it between objects to set text to UITextView somewhere deep inside a controller.
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
}
}
Use it like this:
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)
Also in this code I use simple String extension to convert String hex values into UIColor objects
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)
}
}
回答5:
Swift 5 This is based on Tejas' answer as a few items in both classes were deprecated.
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
}
Don't forget to add UITextViewDelegate to your view controller and set your 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
}
Usage stays the same:
textView.hyperLink(originalText: "To find out more please visit our website", hyperLink: "website", urlString: linkUrl)
回答6:
Using 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)
回答7:
You could use this simple method to add a hyperlink to any set of characters starting with tag
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)
}
}
回答8:
I wanted to do the same thing and ended up just using a UIButton with the title "click here" surrounded by UILabels "just " and " to register", and then:
@IBAction func btnJustClickHereLink(_ sender: UIButton) {
if let url = URL(string: "http://example.com") {
UIApplication.shared.openURL(url)
}
}
来源：https://stackoverflow.com/questions/39238366/uitextview-with-hyperlink-text