如何拦截点击UITextView中的链接？

Question

当用户在UITextView中触摸自动检测的手机链接时,是否可以执行自定义操作.请不要建议使用UIWebView.

请不要只重复苹果课程中的文字参考 - 当然我已经读过了.

谢谢.

Answer 1

更新:从ios10,

- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange interaction:(UITextItemInteraction)interaction;

从ios7和Later UITextView有委托方法:

- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange *NS_DEPRECATED_IOS(7_0, 10_0, "Use textView:shouldInteractWithURL:inRange:forInteractionType: instead");*

拦截点击链接.这是最好的方法.

对于ios6和更早版本,一个很好的方法是通过子类化UIApplication和覆盖-(BOOL)openURL:(NSURL *)url

@interface MyApplication : UIApplication {

}

@end

@implementation MyApplication


-(BOOL)openURL:(NSURL *)url{
    if  ([self.delegate openURL:url])
         return YES;
    else
         return [super openURL:url];
}
@end

您需要openURL:在您的代理中实施.

现在,要让应用程序从您的新子类开始,请UIApplication在项目中找到main.m文件.在这个引导你的应用程序的小文件中,通常有这一行:

int retVal = UIApplicationMain(argc, argv, nil, nil);

第三个参数是应用程序的类名.所以,将此行替换为:

int retVal = UIApplicationMain(argc, argv, @"MyApplication", nil);

这对我有用.

Answer 2

在iOS 7或更高版本中

您可以使用以下UITextView委托方法:

- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange

如果用户点击或长按URL链接,则文本视图会调用此方法.此方法的实现是可选的.默认情况下,文本视图打开负责处理URL类型的应用程序并将URL传递给它.您可以使用此方法触发替代操作,例如在当前应用程序的Web视图中的URL处显示Web内容.

重要:

仅当文本视图可选但不可编辑时,文本视图中的链接才是交互式的.也就是说,如果UITextView的值为selectable属性为YES且isEditable属性为NO.

Answer 3

在 Swift 5 和 iOS 12 中，您可以使用以下三种模式之一来与UITextView.

#1. 使用UITextView的dataDetectorTypes属性。

与 a 中的电话号码、网址或地址进行交互的最简单方法UITextView是使用dataDetectorTypes属性。下面的示例代码显示了如何实现它。使用此代码，当用户点击电话号码时，会UIAlertController弹出一个。

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let textView = UITextView()
        textView.text = "Phone number: +33687654321"
        textView.isUserInteractionEnabled = true
        textView.isEditable = false
        textView.isSelectable = true
        textView.dataDetectorTypes = [.phoneNumber]
        textView.isScrollEnabled = false

        textView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(textView)
        textView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        textView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        textView.leadingAnchor.constraint(equalTo: view.layoutMarginsGuide.leadingAnchor).isActive = true
    }

}

#2. usingUITextViewDelegate的textView(_:shouldInteractWith:in:interaction:)方法

如果您想执行一些自定义操作而不是UIAlertController在使用时点击电话号码时弹出窗口dataDetectorTypes，则必须使您UIViewController符合UITextViewDelegate协议并实施textView(_:shouldInteractWith:in:interaction:)。下面的代码展示了如何实现它：

import UIKit

class ViewController: UIViewController, UITextViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        let textView = UITextView()
        textView.delegate = self
        textView.text = "Phone number: +33687654321"
        textView.isUserInteractionEnabled = true
        textView.isEditable = false
        textView.isSelectable = true
        textView.dataDetectorTypes = [.phoneNumber]
        textView.isScrollEnabled = false

        textView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(textView)
        textView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        textView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        textView.leadingAnchor.constraint(equalTo: view.layoutMarginsGuide.leadingAnchor).isActive = true
    }

    func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
        /* perform your own custom actions here */
        print(URL) // prints: "tel:+33687654321"

        return false // return true if you also want UIAlertController to pop up
    }

}

#3. 使用NSAttributedString和NSAttributedString.Key.link

作为替代方案，您可以使用NSAttributedString并URL为其NSAttributedString.Key.link属性设置 a 。下面的示例代码显示了它的可能实现。使用此代码，当用户点击属性字符串时，会UIAlertController弹出一个。

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let attributedString = NSMutableAttributedString(string: "Contact: ")
        let phoneUrl = NSURL(string: "tel:+33687654321")! // "telprompt://+33687654321" also works
        let attributes = [NSAttributedString.Key.link: phoneUrl]
        let phoneAttributedString = NSAttributedString(string: "phone number", attributes: attributes)
        attributedString.append(phoneAttributedString)

        let textView = UITextView()
        textView.attributedText = attributedString
        textView.isUserInteractionEnabled = true
        textView.isEditable = false
        textView.isSelectable = true
        textView.isScrollEnabled = false

        textView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(textView)
        textView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        textView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        textView.leadingAnchor.constraint(equalTo: view.layoutMarginsGuide.leadingAnchor).isActive = true
    }

}

Answer 4

迅捷版：

您的标准UITextView设置应如下所示，不要忘记委托和dataDetectorTypes。

var textView = UITextView(x: 10, y: 10, width: CardWidth - 20, height: placeholderHeight) //This is my custom initializer
textView.text = "dsfadsaf www.google.com"
textView.selectable = true
textView.dataDetectorTypes = UIDataDetectorTypes.Link
textView.delegate = self
addSubview(textView)

课程结束后，添加以下内容：

class myVC: UIViewController {
    //viewdidload and other stuff here
}

extension MainCard: UITextViewDelegate {
    func textView(textView: UITextView, shouldInteractWithURL URL: NSURL, inRange characterRange: NSRange) -> Bool {
        //Do your stuff over here
        var webViewController = SVModalWebViewController(URL: URL)
        view.presentViewController(webViewController, animated: true, completion: nil)
        return false
    }
}

Answer 5

对于Swift 3

textView.delegate = self

extension MyTextView: UITextViewDelegate 

    func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {

        GCITracking.sharedInstance.track(externalLink: URL)
        return true
    }
}

或者目标是> = IOS 10

func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool