IOS 开发之swift中手势的实例详解

ios 开发之swift中手势的实例详解

手势操作主要包括如下几类

手势	属性	说明
点击 uitapgesturerecognizer	numberoftapsrequired：点击的次数；numberoftouchesrequired：点击时有手指数量	设置属性 numberoftapsrequired 可以实现单击，或双击的效果
滑动 uiswipegesturerecognizer	direction：滑动方向	direction 滑动方向分为上up、下down、左left、右right
拖动 uipangesturerecognizer		在拖动过程中，通过方法 translationinview 获取拖动时的位移
长按 uilongpressgesturerecognizer	minimumpressduration：长按最少时间
旋转 uirotationgesturerecognizer
缩放 uipinchgesturerecognizer

注意：手势效果在实施过程中，存在几种状态：

* began
* ended
* cancelled
* failed
* possible

手势效果图

代码示例

// 点击
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 = "手势操作-单指单击手势";
label.adjustsfontsizetofitwidth = true
label.textalignment = .center;
// 添加手势
let taprecognizer = uitapgesturerecognizer(target: self, action: selector("tapclick:"))
taprecognizer.numberoftapsrequired = 1
taprecognizer.numberoftouchesrequired = 1
label.userinteractionenabled = true
label.addgesturerecognizer(taprecognizer)

// 手势响应方法
func tapclick(recognizer:uitapgesturerecognizer)
{
    let label:uilabel = recognizer.view as! uilabel
    label.textcolor = uicolor.redcolor()
}

// 滑动
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 = "手势操作-左滑手势";
label.adjustsfontsizetofitwidth = true
label.textalignment = .center;
// 添加手势
let swipeleftrecognizer = uiswipegesturerecognizer(target: self, action: selector("swipeleftclick:"))
swipeleftrecognizer.direction = .left
swipeleftrecognizer.numberoftouchesrequired = 1
label.userinteractionenabled = true
label.addgesturerecognizer(swipeleftrecognizer)

// 手势响应方法
func swipeleftclick(recognizer:uiswipegesturerecognizer)
{
    let label = recognizer.view
    label!.backgroundcolor = uicolor.orangecolor()
}

// 拖动
let label = uilabel(frame: cgrectmake(10.0, 10.0, 100.0, 100.0))
self.view.addsubview(label)
label.backgroundcolor = uicolor.lightgraycolor()
label.text = "手势操作-拖动手势";
label.adjustsfontsizetofitwidth = true
label.textalignment = .center;
// 添加手势
let panrecognizer = uipangesturerecognizer(target: self, action: selector("panclick:"))
label.userinteractionenabled = true
label.addgesturerecognizer(panrecognizer)

var pointvalue:cgpoint! = cgpointzero // 移动
// 手势响应方法
func panclick(recognizer:uipangesturerecognizer)
{
    let label:uilabel = recognizer.view as! uilabel

    let point = recognizer.translationinview(label)
    print("pan point = \(point)")

    // 移动
    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
    }
}

// 缩放
let label = uilabel(frame: cgrectmake(10.0, 10.0, 200.0, 200.0))
self.view.addsubview(label)
label.backgroundcolor = uicolor.lightgraycolor()
label.text = "手势操作-捏合手势";
label.adjustsfontsizetofitwidth = true
label.textalignment = .center;
// 添加手势
let pinchrecognizer = uipinchgesturerecognizer(target: self, action: selector("pinchclick:"))
label.userinteractionenabled = true
label.addgesturerecognizer(pinchrecognizer)

// 手势响应方法
var scalevalue:cgfloat! = 1.0 // 缩放
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
    {
      // 缩小
      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
      }
    }
}

// 旋转
let label = uilabel(frame: cgrectmake(10.0, 10.0, 200.0, 200.0))
self.view.addsubview(label)
label.backgroundcolor = uicolor.lightgraycolor()
label.text = "手势操作-旋转手势";
label.adjustsfontsizetofitwidth = true
label.textalignment = .center;
// 添加手势
let rotationrecognizer = uirotationgesturerecognizer(target: self, action: selector("ratotionclick:"))
label.userinteractionenabled = true
label.addgesturerecognizer(rotationrecognizer)

var rotationvalue:cgfloat! = 1.0 // 旋转
// 手势响应方法
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
    }
}

// 长按
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 = "手势操作-长按手势";
label.adjustsfontsizetofitwidth = true
label.textalignment = .center;
// 添加手势
let pressrecognizer = uilongpressgesturerecognizer(target: self, action: selector("pressclick:"))
    pressrecognizer.minimumpressduration = 3.0
    label.userinteractionenabled = true
    label.addgesturerecognizer(pressrecognizer)

// 手势响应方法
func pressclick(recognizer:uilongpressgesturerecognizer)
{
    let label:uilabel = recognizer.view as! uilabel

    if recognizer.state == .began
    {
      let alertview = uialertview(title: nil, message: "长按响应", 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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