检测在属性文本水龙头在iOS的一个UITextView检测在属性文本水龙头在iOS的一个UIText

2019-05-08 20:23发布

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我有一个UITextView ，其显示NSAttributedString 。此字符串包含了我想提出可点击，使得它们被挖掘当我打电话回来，这样我可以执行的操作的话。我认识到， UITextView可以检测到一个URL水龙头和回叫我的委托，但这些都不是网址。

在我看来，这与iOS 7和TextKit的力量现在应该是可能的，但是我找不到任何的例子，我不知道从哪里开始。

据我所知，它现在可以创建字符串中的自定义属性（虽然我还没有这样做还），也许这将是有益的，如果中了咒语一个被窃听了检测？在任何情况下，我还是不知道如何拦截自来水和检测上出现该单词的水龙头。

需要注意的是iOS 6的兼容性不是必需的。

Answer 1:

我只是想帮助别人多一点。从Shmidt的响应继有可能做的正是我在我原来的问题问。

1）创建一个归因串与施加到可点击的话自定义属性。例如。

NSAttributedString* attributedString = [[NSAttributedString alloc] initWithString:@"a clickable word" attributes:@{ @"myCustomTag" : @(YES) }];
[paragraph appendAttributedString:attributedString];

2）创建一个UITextView显示该字符串，并添加一个UITapGestureRecognizer到它。然后把手水龙头：

- (void)textTapped:(UITapGestureRecognizer *)recognizer
{
    UITextView *textView = (UITextView *)recognizer.view;

    // Location of the tap in text-container coordinates

    NSLayoutManager *layoutManager = textView.layoutManager;
    CGPoint location = [recognizer locationInView:textView];
    location.x -= textView.textContainerInset.left;
    location.y -= textView.textContainerInset.top;

    // Find the character that's been tapped on

    NSUInteger characterIndex;
    characterIndex = [layoutManager characterIndexForPoint:location
                                           inTextContainer:textView.textContainer
                  fractionOfDistanceBetweenInsertionPoints:NULL];

    if (characterIndex < textView.textStorage.length) {

        NSRange range;
        id value = [textView.attributedText attribute:@"myCustomTag" atIndex:characterIndex effectiveRange:&range];

        // Handle as required...

        NSLog(@"%@, %d, %d", value, range.location, range.length);

    }
}

所以容易当你知道如何！

Answer 2:

与雨燕属性文本检测水龙头

有时，对于初学者来说这是一个有点很难知道该怎么做把事情成立（这对我来说是这样），所以这个例子是有点丰满了。

一个添加`UITextView`到您的项目。

出口

连接UITextView的ViewController名为插座textView 。

自定义属性

我们将通过进行制作自定义属性扩展。

注意：这一步是技术上可选的，但是如果你不这样做，你将需要在接下来的部分编辑代码，使用标准的属性一样NSAttributedString.Key.foregroundColor 。使用自定义属性的好处是，你可以定义你想要的属性文本范围存储什么值。

添加一个新的快捷文件， 文件>新建>文件...>的iOS>源>斯威夫特文件 。你可以称之为你想要什么。我呼吁我的NSAttributedStringKey + CustomAttribute.swift。

粘贴下面的代码：

import Foundation

extension NSAttributedString.Key {
    static let myAttributeName = NSAttributedString.Key(rawValue: "MyCustomAttribute")
}

码

与替换为以下ViewController.swift代码。注意UIGestureRecognizerDelegate 。

import UIKit
class ViewController: UIViewController, UIGestureRecognizerDelegate {

    @IBOutlet weak var textView: UITextView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Create an attributed string
        let myString = NSMutableAttributedString(string: "Swift attributed text")

        // Set an attribute on part of the string
        let myRange = NSRange(location: 0, length: 5) // range of "Swift"
        let myCustomAttribute = [ NSAttributedString.Key.myAttributeName: "some value"]
        myString.addAttributes(myCustomAttribute, range: myRange)

        textView.attributedText = myString

        // Add tap gesture recognizer to Text View
        let tap = UITapGestureRecognizer(target: self, action: #selector(myMethodToHandleTap(_:)))
        tap.delegate = self
        textView.addGestureRecognizer(tap)
    }

    @objc func myMethodToHandleTap(_ sender: UITapGestureRecognizer) {

        let myTextView = sender.view as! UITextView
        let layoutManager = myTextView.layoutManager

        // location of tap in myTextView coordinates and taking the inset into account
        var location = sender.location(in: myTextView)
        location.x -= myTextView.textContainerInset.left;
        location.y -= myTextView.textContainerInset.top;

        // character index at tap location
        let characterIndex = layoutManager.characterIndex(for: location, in: myTextView.textContainer, fractionOfDistanceBetweenInsertionPoints: nil)

        // if index is valid then do something.
        if characterIndex < myTextView.textStorage.length {

            // print the character index
            print("character index: \(characterIndex)")

            // print the character at the index
            let myRange = NSRange(location: characterIndex, length: 1)
            let substring = (myTextView.attributedText.string as NSString).substring(with: myRange)
            print("character at index: \(substring)")

            // check if the tap location has a certain attribute
            let attributeName = NSAttributedString.Key.myAttributeName
            let attributeValue = myTextView.attributedText?.attribute(attributeName, at: characterIndex, effectiveRange: nil)
            if let value = attributeValue {
                print("You tapped on \(attributeName.rawValue) and the value is: \(value)")
            }

        }
    }
}

现在，如果你点击了“雨燕”的“W”，你应该得到以下结果：

character index: 1
character at index: w
You tapped on MyCustomAttribute and the value is: some value

笔记

在这里，我使用了自定义属性，但它可能很容易被NSAttributedString.Key.foregroundColor具有的价值（文字颜色） UIColor.green 。
前身为文本视图不能编辑或可选择的，但是我更新的答案雨燕4.2这似乎是做工精细，无论这些是否选择与否。

进一步研究

这个答案是基于几个其他回答这个问题。除了这些，也见

高级文本布局与文字工具影响（WWDC 2013视频）
属性串编程指南
如何用斯威夫特做出属性串？

Answer 3:

这是一个稍微修改后的版本，构建关@tarmes答案。我无法得到的value变量返回任何东西，但null不低于的好办法。另外，我需要的，以便确定最终的操作返回的全属性字典。我早就把这个意见，但不会出现有代表这样做。提前道歉，如果我违反协议。

具体的调整是用textView.textStorage而不是textView.attributedText 。作为一个还在学习的iOS程序员，我真的不知道这是为什么，但也许别人可以启发我们。

在抽头处理方法具体修饰：

    NSDictionary *attributesOfTappedText = [textView.textStorage attributesAtIndex:characterIndex effectiveRange:&range];

在我的视图控制器的完整代码

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.textView.attributedText = [self attributedTextViewString];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(textTapped:)];

    [self.textView addGestureRecognizer:tap];
}  

- (NSAttributedString *)attributedTextViewString
{
    NSMutableAttributedString *paragraph = [[NSMutableAttributedString alloc] initWithString:@"This is a string with " attributes:@{NSForegroundColorAttributeName:[UIColor blueColor]}];

    NSAttributedString* attributedString = [[NSAttributedString alloc] initWithString:@"a tappable string"
                                                                       attributes:@{@"tappable":@(YES),
                                                                                    @"networkCallRequired": @(YES),
                                                                                    @"loadCatPicture": @(NO)}];

    NSAttributedString* anotherAttributedString = [[NSAttributedString alloc] initWithString:@" and another tappable string"
                                                                              attributes:@{@"tappable":@(YES),
                                                                                           @"networkCallRequired": @(NO),
                                                                                           @"loadCatPicture": @(YES)}];
    [paragraph appendAttributedString:attributedString];
    [paragraph appendAttributedString:anotherAttributedString];

    return [paragraph copy];
}

- (void)textTapped:(UITapGestureRecognizer *)recognizer
{
    UITextView *textView = (UITextView *)recognizer.view;

    // Location of the tap in text-container coordinates

    NSLayoutManager *layoutManager = textView.layoutManager;
    CGPoint location = [recognizer locationInView:textView];
    location.x -= textView.textContainerInset.left;
    location.y -= textView.textContainerInset.top;

    NSLog(@"location: %@", NSStringFromCGPoint(location));

    // Find the character that's been tapped on

    NSUInteger characterIndex;
    characterIndex = [layoutManager characterIndexForPoint:location
                                       inTextContainer:textView.textContainer
              fractionOfDistanceBetweenInsertionPoints:NULL];

    if (characterIndex < textView.textStorage.length) {

        NSRange range;
        NSDictionary *attributes = [textView.textStorage attributesAtIndex:characterIndex effectiveRange:&range];
        NSLog(@"%@, %@", attributes, NSStringFromRange(range));

        //Based on the attributes, do something
        ///if ([attributes objectForKey:...)] //make a network call, load a cat Pic, etc

    }
}

Answer 4:

制作自定义链接，做你想做的水龙头已经变得更加容易与iOS 7有很好的例子就是在雷Wenderlich

Answer 5:

WWDC 2013例如：

NSLayoutManager *layoutManager = textView.layoutManager;
 CGPoint location = [touch locationInView:textView];
 NSUInteger characterIndex;
 characterIndex = [layoutManager characterIndexForPoint:location
inTextContainer:textView.textContainer
fractionOfDistanceBetweenInsertionPoints:NULL];
if (characterIndex < textView.textStorage.length) { 
// valid index
// Find the word range here
// using -enumerateSubstringsInRange:options:usingBlock:
}

Answer 6:

我能够与NSLinkAttributeName相当简单的解决这个问题

斯威夫特2

class MyClass: UIViewController, UITextViewDelegate {

  @IBOutlet weak var tvBottom: UITextView!

  override func viewDidLoad() {
      super.viewDidLoad()

     let attributedString = NSMutableAttributedString(string: "click me ok?")
     attributedString.addAttribute(NSLinkAttributeName, value: "cs://moreinfo", range: NSMakeRange(0, 5))
     tvBottom.attributedText = attributedString
     tvBottom.delegate = self

  }

  func textView(textView: UITextView, shouldInteractWithURL URL: NSURL, inRange characterRange: NSRange) -> Bool {
      UtilityFunctions.alert("clicked", message: "clicked")
      return false
  }

}

Answer 7:

用于检测在属性文本操作与斯威夫特3完整的例子

let termsAndConditionsURL = TERMS_CONDITIONS_URL;
let privacyURL            = PRIVACY_URL;

override func viewDidLoad() {
    super.viewDidLoad()

    self.txtView.delegate = self
    let str = "By continuing, you accept the Terms of use and Privacy policy"
    let attributedString = NSMutableAttributedString(string: str)
    var foundRange = attributedString.mutableString.range(of: "Terms of use") //mention the parts of the attributed text you want to tap and get an custom action
    attributedString.addAttribute(NSLinkAttributeName, value: termsAndConditionsURL, range: foundRange)
    foundRange = attributedString.mutableString.range(of: "Privacy policy")
    attributedString.addAttribute(NSLinkAttributeName, value: privacyURL, range: foundRange)
    txtView.attributedText = attributedString
}

然后你就可以赶上与动作shouldInteractWith URL UITextViewDelegate代表method.So确保您已正确设置委托。

func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "WebView") as! SKWebViewController

        if (URL.absoluteString == termsAndConditionsURL) {
            vc.strWebURL = TERMS_CONDITIONS_URL
            self.navigationController?.pushViewController(vc, animated: true)
        } else if (URL.absoluteString == privacyURL) {
            vc.strWebURL = PRIVACY_URL
            self.navigationController?.pushViewController(vc, animated: true)
        }
        return false
    }

就像聪明的您可以根据您的要求执行任何动作。

干杯！！

Answer 8:

这是可能做到这一点与characterIndexForPoint:inTextContainer:fractionOfDistanceBetweenInsertionPoints: 它会工作稍有不同，你想要的-你必须测试一个抽头字符属于一个神奇的词 。但它不应该是复杂的。

顺便说一句，我强烈建议从WWDC 2013看文字介绍套件 。

Answer 9:

这一条可能工作确定的短链接，多链路中一个TextView。它工作确定与iOS 6,7,8。

- (void)tappedTextView:(UITapGestureRecognizer *)tapGesture {
    if (tapGesture.state != UIGestureRecognizerStateEnded) {
        return;
    }
    UITextView *textView = (UITextView *)tapGesture.view;
    CGPoint tapLocation = [tapGesture locationInView:textView];

    NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink|NSTextCheckingTypePhoneNumber
                                                           error:nil];
    NSArray* resultString = [detector matchesInString:self.txtMessage.text options:NSMatchingReportProgress range:NSMakeRange(0, [self.txtMessage.text length])];
    BOOL isContainLink = resultString.count > 0;

    if (isContainLink) {
        for (NSTextCheckingResult* result in  resultString) {
            CGRect linkPosition = [self frameOfTextRange:result.range inTextView:self.txtMessage];

            if(CGRectContainsPoint(linkPosition, tapLocation) == 1){
                if (result.resultType == NSTextCheckingTypePhoneNumber) {
                    NSString *phoneNumber = [@"telprompt://" stringByAppendingString:result.phoneNumber];
                    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:phoneNumber]];
                }
                else if (result.resultType == NSTextCheckingTypeLink) {
                    [[UIApplication sharedApplication] openURL:result.URL];
                }
            }
        }
    }
}

 - (CGRect)frameOfTextRange:(NSRange)range inTextView:(UITextView *)textView
{
    UITextPosition *beginning = textView.beginningOfDocument;
    UITextPosition *start = [textView positionFromPosition:beginning offset:range.location];
    UITextPosition *end = [textView positionFromPosition:start offset:range.length];
    UITextRange *textRange = [textView textRangeFromPosition:start toPosition:end];
    CGRect firstRect = [textView firstRectForRange:textRange];
    CGRect newRect = [textView convertRect:firstRect fromView:textView.textInputView];
    return newRect;
}

Answer 10:

随着雨燕4.2和iOS 12，你可以创建一个子类UITextView和覆盖hitTest(_:with:)或point(inside:with:) ，以便与一些TextKit实施，使只有一些NSAttributedStrings它可点击。

下面的代码演示如何创建一个UITextView ，只有反应轻叩强调 NSAttributedStrings它：

InteractiveUnderlinedTextView.swift

import UIKit

class InteractiveUnderlinedTextView: UITextView {

    override init(frame: CGRect, textContainer: NSTextContainer?) {
        super.init(frame: frame, textContainer: textContainer)
        configure()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        configure()
    }

    func configure() {
        isScrollEnabled = false
        isEditable = false
        isSelectable = false
        isUserInteractionEnabled = true
    }

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        let characterIndex = layoutManager.characterIndex(for: point, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
        guard characterIndex < textStorage.length else { return nil }
        let attributes = textStorage.attributes(at: characterIndex, effectiveRange: nil)
        return attributes[NSAttributedString.Key.underlineStyle] != nil ? self : nil
    }

    /*
    // Alternative using point(inside:with:)
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        let characterIndex = layoutManager.characterIndex(for: point, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
        guard characterIndex < textStorage.length else { return false }
        let attributes = textStorage.attributes(at: characterIndex, effectiveRange: nil)
        return attributes[NSAttributedString.Key.underlineStyle] != nil
    }
    */

}

ViewController.swift

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let linkTextView = InteractiveUnderlinedTextView()

        let mutableAttributedString = NSMutableAttributedString(string: "Some text\n\n")
        let attributes = [NSAttributedString.Key.underlineStyle: NSUnderlineStyle.single.rawValue]
        let underlinedAttributedString = NSAttributedString(string: "Some other text", attributes: attributes)
        mutableAttributedString.append(underlinedAttributedString)
        linkTextView.attributedText = mutableAttributedString

        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(underlinedTextTapped))
        linkTextView.addGestureRecognizer(tapGesture)

        view.addSubview(linkTextView)
        linkTextView.translatesAutoresizingMaskIntoConstraints = false
        linkTextView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        linkTextView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        linkTextView.leadingAnchor.constraint(equalTo: view.readableContentGuide.leadingAnchor).isActive = true

    }

    @objc func underlinedTextTapped(_ sender: UITapGestureRecognizer) {
        print("Hello")
    }

}

文章来源: Detecting taps on attributed text in a UITextView in iOS

标签： ios objective-c uitextview textkit

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