如何將平移手勢識別器限制為發生捏合手勢？

當用戶處于捏合手勢程序中時，您如何僅接受平移手勢？換句話說，我想避免提供單指平移手勢。

@IBAction func pinchPiece(_ pinchGestureRecognizer: UIPinchGestureRecognizer) {
    guard pinchGestureRecognizer.state == .began || pinchGestureRecognizer.state == .changed,
          let piece = pinchGestureRecognizer.view else {
            // After pinch releases, zoom back out.
            if pinchGestureRecognizer.state == .ended {
              UIView.animate(withDuration: 0.3, animations: {
                pinchGestureRecognizer.view?.transform = CGAffineTransform.identity
              })
            }
            return
    }
    adjustAnchor(for: pinchGestureRecognizer)
    
    let scale = pinchGestureRecognizer.scale
    piece.transform = piece.transform.scaledBy(x: scale, y: scale)
    pinchGestureRecognizer.scale = 1 // Clear scale so that it is the right delta next time.
}

@IBAction func panPiece(_ panGestureRecognizer: UIPanGestureRecognizer) {
    guard panGestureRecognizer.state == .began || panGestureRecognizer.state == .changed,
          let piece = panGestureRecognizer.view else {
        return
    }
    let translation = panGestureRecognizer.translation(in: piece.superview)
    piece.center = CGPoint(x: piece.center.x   translation.x, y: piece.center.y   translation.y)
    panGestureRecognizer.setTranslation(.zero, in: piece.superview)
}

public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer,
                            shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    true
}

uj5u.com熱心網友回復：

你可以使用 require(toFail:)

例如，如果你有兩個手勢tap和swipe

輕掃手勢是輕敲，然后是線性運動，而輕敲只是輕敲——在檢查輕敲手勢之前，我們需要確保輕掃手勢絕對沒有被識別器識別。

iOS 通常在這方面做得相當好，但沒有必要讓它碰運氣：如果你在點擊手勢識別器上呼叫 require(toFail:)，傳入滑動識別器，iOS 肯定會確保它們不會競爭：

let swipe = UISwipeGestureRecognizer(target: self, action: #selector(executeSwipe))
let tap = UITapGestureRecognizer(target: self, action: #selector(executeTap))

view.addGestureRecognizer(swipe)
view.addGestureRecognizer(tap)

tap.require(toFail: swipe)

uj5u.com熱心網友回復：

您可以輕松啟用和禁用您的手勢。當它開始捏合時禁用平移手勢并在它結束捏合時啟用它。當它開始平移時禁用捏合手勢并在結束平移時啟用它。

@IBAction func pinchPiece(_ pinchGestureRecognizer: UIPinchGestureRecognizer) {
    guard pinchGestureRecognizer.state == .began || pinchGestureRecognizer.state == .changed,
          let piece = pinchGestureRecognizer.view else {
             yourPangesture.isEnable = false // Disable Pangesture
            // After pinch releases, zoom back out.
            if pinchGestureRecognizer.state == .ended {
              UIView.animate(withDuration: 0.3, animations: {
                pinchGestureRecognizer.view?.transform = CGAffineTransform.identity
              })
            }
            return
    }
    if pinchGestureRecognizer.state == .end {
         yourPangesture.isEnable = true  // Enabling again
    }
    adjustAnchor(for: pinchGestureRecognizer)
    
    let scale = pinchGestureRecognizer.scale
    piece.transform = piece.transform.scaledBy(x: scale, y: scale)
    pinchGestureRecognizer.scale = 1 // Clear scale so that it is the right delta next time.
}

對 panPiece 功能執行相同操作。

標籤：ios 迅速 手势识别器 手势识别器

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