[英]How to detect tap on particular line on UITextView?
我有一个UITextview
我想做几个词作为链接,以便我可以检测到它们的点击并获取回调函数。 我已经将UITextView
链接属性设置为选中并在下面的委托方法中实现。
func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
print("hello")
return true
}
@available(iOS 10.0, *)
func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
print("bye")
return true
}
我还使用NSMutableString
将字符串设置为粗体和斜体
let str = NSMutableAttributedString(string: self.tvBottom.text as String, attributes: [NSFontAttributeName:UIFont.systemFont(ofSize: 17.0)])
str.addAttribute(NSLinkAttributeName, value: "http://www.google.com", range: NSRange(location: 4, length: 14))
str.addAttribute(NSForegroundColorAttributeName, value: UIColor.blue , range: NSRange(location: 4, length: 14))
let boldFontAttribute = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 17.0)]
str.addAttributes(boldFontAttribute, range: NSRange(location: 4, length: 14))
str.addAttribute(NSUnderlineStyleAttributeName , value: NSUnderlineStyle.styleSingle.rawValue, range: NSRange(location: 4, length: 14))
self.tvBottom.attributedText = str
我怎样才能做到这一点?
要检测特定行上的轻击(如您的问题的标题所示),那么以下代码即可完成工作:
func didTapTextView(recognizer: UITapGestureRecognizer) {
if recognizer.state == .recognized {
let location = recognizer.location(ofTouch: 0, in: textView)
if location.y >= 0 && location.y <= textView.contentSize.height {
guard let font = textView.font else {
return
}
let line = Int((location.y - textView.textContainerInset.top) / font.lineHeight) + 1
print("Line is \(line)")
}
}
}
当在我们的textView上检测到轻敲时,下面的代码用于调用上述方法。
let tap = UITapGestureRecognizer(target: self, action: #selector(didTapTextView(recognizer:)))
tap.cancelsTouchesInView = false
textView.addGestureRecognizer(tap)
但是,如果只想检测链接上的点击,则应遵循UITextViewDelegate
协议,并实现以下方法:
func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
return true
}
当然,您需要将委托添加到您的textView中(例如,在viewDidLoad()
)
textView.delegate = self
PS您的UITextView
应该不可编辑。
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