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IOS 開發之swift中手勢的實例詳解
手勢操作主要包括如下幾類
| 手勢 | 屬性 | 說明 |
|---|---|---|
| 點擊 UITapGestureRecognizer | numberOfTapsRequired：點擊的次數；numberOfTouchesRequired：點擊時有手指數量 | 設置屬性 numberOfTapsRequired 可以實現單擊，或雙擊的效果 |
| 滑動 UISwipeGestureRecognizer | direction：滑動方向 | direction 滑動方向分為上Up、下Down、左Left、右Right |
| 拖動 UIPanGestureRecognizer | 在拖動過程中，通過方法 translationInView 獲取拖動時的位移 | |
| 長按 UILongPressGestureRecognizer | minimumPressDuration：長按最少時間 | |
| 旋轉 UIRotationGestureRecognizer | ||
| 縮放 UIPinchGestureRecognizer |
注意：手勢效果在實施過程中，存在幾種狀態：
* Began
* Ended
* Cancelled
* Failed
* Possible
手勢效果圖
代碼示例
// 點擊
let label = UILabel(frame: CGRectMake(10.0, 10.0, (self.view.frame.size.width - 10.0 * 2), 60.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手勢操作-單指單擊手勢";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手勢
let tapRecognizer = UITapGestureRecognizer(target: self, action: Selector("tapClick:"))
tapRecognizer.numberOfTapsRequired = 1
tapRecognizer.numberOfTouchesRequired = 1
label.userInteractionEnabled = true
label.addGestureRecognizer(tapRecognizer)
// 手勢響應方法
func tapClick(recognizer:UITapGestureRecognizer)
{
let label:UILabel = recognizer.view as! UILabel
label.textColor = UIColor.redColor()
}
// 滑動
let label = UILabel(frame: CGRectMake(10.0, 10.0, (self.view.frame.size.width - 10.0 * 2), 60.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手勢操作-左滑手勢";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手勢
let swipeLeftRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipeLeftClick:"))
swipeLeftRecognizer.direction = .Left
swipeLeftRecognizer.numberOfTouchesRequired = 1
label.userInteractionEnabled = true
label.addGestureRecognizer(swipeLeftRecognizer)
// 手勢響應方法
func swipeLeftClick(recognizer:UISwipeGestureRecognizer)
{
let label = recognizer.view
label!.backgroundColor = UIColor.orangeColor()
}
// 拖動
let label = UILabel(frame: CGRectMake(10.0, 10.0, 100.0, 100.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手勢操作-拖動手勢";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手勢
let panRecognizer = UIPanGestureRecognizer(target: self, action: Selector("panClick:"))
label.userInteractionEnabled = true
label.addGestureRecognizer(panRecognizer)
var pointValue:CGPoint! = CGPointZero // 移動
// 手勢響應方法
func panClick(recognizer:UIPanGestureRecognizer)
{
let label:UILabel = recognizer.view as! UILabel
let point = recognizer.translationInView(label)
print("pan point = \(point)")
// 移動
label.transform = CGAffineTransformMakeTranslation(point.x + self.pointValue.x, point.y + self.pointValue.y)
if recognizer.state == .Began
{
label.backgroundColor = UIColor.yellowColor()
self.view.bringSubviewToFront(label)
}
else if recognizer.state == .Ended
{
label.backgroundColor = UIColor.lightGrayColor()
self.pointValue.x += point.x
self.pointValue.y += point.y
}
}
// 縮放
let label = UILabel(frame: CGRectMake(10.0, 10.0, 200.0, 200.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手勢操作-捏合手勢";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手勢
let pinchRecognizer = UIPinchGestureRecognizer(target: self, action: Selector("pinchClick:"))
label.userInteractionEnabled = true
label.addGestureRecognizer(pinchRecognizer)
// 手勢響應方法
var scaleValue:CGFloat! = 1.0 // 縮放
func pinchClick(recognizer:UIPinchGestureRecognizer)
{
let label:UILabel = recognizer.view as! UILabel
let scale = recognizer.scale;
if scale > 1.0
{
// 放大
label.transform = CGAffineTransformMakeScale(self.scaleValue + scale - 1.0, self.scaleValue + scale - 1.0)
}
else
{
// 縮小
label.transform = CGAffineTransformMakeScale(self.scaleValue * scale, self.scaleValue * scale)
}
if recognizer.state == .Began
{
label.backgroundColor = UIColor.greenColor()
self.view.bringSubviewToFront(label)
}
else if recognizer.state == .Ended
{
label.backgroundColor = UIColor.lightGrayColor()
if scale > 1.0
{
self.scaleValue = self.scaleValue + scale - 1.0;
}
else
{
self.scaleValue = self.scaleValue * scale
}
}
}
// 旋轉
let label = UILabel(frame: CGRectMake(10.0, 10.0, 200.0, 200.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手勢操作-旋轉手勢";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手勢
let rotationRecognizer = UIRotationGestureRecognizer(target: self, action: Selector("ratotionClick:"))
label.userInteractionEnabled = true
label.addGestureRecognizer(rotationRecognizer)
var rotationValue:CGFloat! = 1.0 // 旋轉
// 手勢響應方法
func ratotionClick(recognizer:UIRotationGestureRecognizer)
{
let label:UILabel = recognizer.view as! UILabel
let rotation = recognizer.rotation
label.transform = CGAffineTransformMakeRotation(rotation + self.rotationValue)
if recognizer.state == .Began
{
label.backgroundColor = UIColor.greenColor()
self.view.bringSubviewToFront(label)
}
else if recognizer.state == .Ended
{
label.backgroundColor = UIColor.lightGrayColor()
self.rotationValue = self.rotationValue + rotation
}
}
// 長按
let label = UILabel(frame: CGRectMake(10.0, 10.0, (self.view.frame.size.width - 10.0 * 2), 60.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手勢操作-長按手勢";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手勢
let pressRecognizer = UILongPressGestureRecognizer(target: self, action: Selector("pressClick:"))
pressRecognizer.minimumPressDuration = 3.0
label.userInteractionEnabled = true
label.addGestureRecognizer(pressRecognizer)
// 手勢響應方法
func pressClick(recognizer:UILongPressGestureRecognizer)
{
let label:UILabel = recognizer.view as! UILabel
if recognizer.state == .Began
{
let alertView = UIAlertView(title: nil, message: "長按響應", delegate: nil, cancelButtonTitle: "知道了")
alertView.show()
label.backgroundColor = UIColor.orangeColor()
self.view.bringSubviewToFront(label)
}
else if recognizer.state == .Ended
{
label.backgroundColor = UIColor.lightGrayColor()
}
}
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