ios – 在键盘显示时检测UITextView中属性文本的点击

这是 a previous answer of mine问题 a previous answer of mine的补充问题.

我使用Xcode 7.1.1和iOS 9.1重新测试了以下代码,它可以与我链接的答案中描述的设置一起使用.

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 = [ "MyCustomAttributeName": "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)
    }

    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.locationInView(myTextView)
        location.x -= myTextView.textContainerInset.left;
        location.y -= myTextView.textContainerInset.top;

        // character index at tap location
        let characterIndex = layoutManager.characterIndexForPoint(location,inTextContainer: 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).substringWithRange(myRange)
            print("character at index: \(substring)")

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

        }
    }
}

但是,如果更改了UITextView设置,则它既可编辑又可选

然后这将导致键盘显示.显示键盘后,不再调用tap事件处理程序.在键盘显示时可以做些什么来检测属性文本的点击？

更新

虽然这里的代码是在Swift中,但最初提出这个问题的人(在我上面链接的答案的评论中)正在使用Objective-C.所以我很乐意接受Swift或Objective-C的答案.

解决方法

在您的UITextView控制器中,您可以实现UITextViewDelegate,然后覆盖方法

-(BOOL)textViewShouldBeginEditing:(UITextView *)textView{
}

在此方法中,您可以访问textView的selectedRange,它也应该是您的属性文本的“tap range”.然后根据您的需要返回true / false.