当textView isScrollEnabled = false

Question

我已使用pinchGesture使用以下代码放大和缩小textView。

将pinchGesture添加到了textView

let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(self.handlePinch))
pinchGesture.delegate = self
view.addGestureRecognizer(pinchGesture)

排污物

@IBAction func handlePinch(recognizer:UIPinchGestureRecognizer) {
    if let view = recognizer.view as? UITextView {
        view.transform = view.transform.scaledBy(x: recognizer.scale, y: recognizer.scale)
        recognizer.scale = 1
    }
}

结果

这是我应用的可能解决方案，但仍然找不到完美的解决方案。

@IBAction func handlePinch(recognizer:UIPinchGestureRecognizer) {
    if let textView = recognizer.view as? UITextView {
        let font = textView.font!
        var pointSize = font.pointSize
        let fontName = font.fontName
        pointSize = ((recognizer.velocity > 0) ? 1 : -1) * 1 + pointSize;
        if (pointSize < 13) {
            pointSize = 13
        }
        if (pointSize > 100) {
            pointSize = 100
        }
        textView.font = UIFont(name: fontName, size: pointSize)
    }
}

结果

使用上述解决方案，我能够成功增加字体大小，但是textView框架未更新，因此由于textView框架较小，因此文本被截断。

预期结果

字体会增加，框架也会更新，因此看起来像是简单的放大和缩小，但没有模糊。

正在寻找最佳解决方案以增加像 instagram 和手套这样的框架的字体大小。

谢谢。

Answer 1

以下是使用UITextView和isScrollEnabled = false

来调整字体大小以及缩小/放大帧的代码

@objc func pinchRecoginze(_ pinchGesture: UIPinchGestureRecognizer) {
   guard recognizer.view != nil, let view = recognizer.view else {return}

    if view is UITextView {
        let textView = view as! UITextView
        if recognizer.state == .began {
            let font = textView.font
            let pointSize = font!.pointSize
            recognizer.scale = pointSize * 0.1
        }
        if 1 <= recognizer.scale && recognizer.scale <= 10  {
            textView.font = UIFont(name: textView.font!.fontName, size: recognizer.scale * 10)
            let textViewSiSize = textView.intrinsicContentSize
            textView.bounds.size = textViewSiSize
        }
    }
}

更新了答案，使其与UITextView兼容

Answer 2

如果您尝试在handlePinch方法的开头启用滚动并在缩放结束时再次禁用滚动该怎么办？：

@IBAction func handlePinch(recognizer:UIPinchGestureRecognizer) {
  if let textView = recognizer.view as? UITextView {
    textView.isScrollingEnabled = true
    let font = textView.font!
    var pointSize = font.pointSize
    let fontName = font.fontName
    pointSize = ((recognizer.velocity > 0) ? 1 : -1) * 1 + pointSize;
    if (pointSize < 13) {
        pointSize = 13
    }
    if (pointSize > 100) {
        pointSize = 100
    }
    textView.font = UIFont(name: fontName, size: pointSize)
    let width = view.frame.size.width
    textView.frame.size = textView.sizeThatFits(CGSize(width: width, height: CGFloat.greatestFiniteMagnitude))
    textView.isScrollingEnabled = false
  }
}

Answer 3

这里是pinchGesture textView时使用isScrollEnabled = false调整字体和框架大小的方法。

@IBAction func handlePinch(recognizer:UIPinchGestureRecognizer) {
        if let view = recognizer.view {
            if view is UITextView {
                let textView = view as! UITextView
                if textView.font!.pointSize * recognizer.scale < 90 {
                    let font = UIFont(name: textView.font!.fontName, size: textView.font!.pointSize * recognizer.scale)
                    textView.font = font
                    let sizeToFit = textView.sizeThatFits(CGSize(width: UIScreen.main.bounds.size.width,
                                                                 height:CGFloat.greatestFiniteMagnitude))
                    textView.bounds.size = CGSize(width: textView.intrinsicContentSize.width,
                                                  height: sizeToFit.height)
                } else {
                    let sizeToFit = textView.sizeThatFits(CGSize(width: UIScreen.main.bounds.size.width,
                                                                 height:CGFloat.greatestFiniteMagnitude))
                    textView.bounds.size = CGSize(width: textView.intrinsicContentSize.width,
                                                  height: sizeToFit.height)
                }
                textView.setNeedsDisplay()
            } else {
                view.transform = view.transform.scaledBy(x: recognizer.scale, y: recognizer.scale)
            }
            recognizer.scale = 1
        }
    }