今天來介紹一下iOS中相當方便的一個功能：手勢。
分別為Tap 輕點、LongPress 長按、Swipe 滑動、Pan 拖曳、Pinch 縮放及Rotation 旋轉。

Tap

首先在viewdidload()中加入以下程式碼

let tap = UITapGestureRecognizer(target: self, action: #selector(self.tap))
tap.numberOfTapsRequired = 1
tap.numberOfTouchesRequired = 1
self.views.addGestureRecognizer(tap)

• action為觸發此手勢後的method
• numberOfTapsRequired表示點擊的次數，故此處為點擊一下觸發
• numberOfTouchesRequired為幾指點擊，故此處為單指點擊
• self.views.addGestureRecognizer(tap)為將這個手勢加到views中

LongPress

在viewdidload()中加入以下程式碼

let longpress = UILongPressGestureRecognizer(target: self, action: #selector(self.longpress))
self.views.addGestureRecognizer(longpress)

在長按後會觸發一個method

func longpress(recognizer:UILongPressGestureRecognizer){
    if recognizer.state == .began{
        self.views.labelS.text = "長按開始"
    }else if recognizer.state == .ended{
        self.views.labelS.text = "長按結束"
    }
}

Swipe

在viewdidload()中加入以下程式碼

let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(VC.swipe))
swipeUp.direction = .up
self.myUIView.addGestureRecognizer(swipeUp)

• direction為滑動的方向可選擇.up、.down、.right、.left。

在觸發的method swipe中會有一個傳入值UISwipeGestureRecognizer也會有一個參數direction可以來確認滑動之方向。

Pan

在viewdidload()中加入以下程式碼

let pan = UIPanGestureRecognizer(target: self, action: #selector(VC.pan))
pan.minimumNumberOfTouches = 1
pan.maximumNumberOfTouches = 1
self.myUIView.addGestureRecognizer(pan)

• minimumNumberOfTouches：最少能用幾指拖曳
• maximumNumberOfTouches：最多能用幾指拖曳

在觸發的method pan中會有一個傳入值UIPanGestureRecognizer會有一個參數.location可以來確認拖曳的位置。

Pinch

在viewdidload()中加入以下程式碼

let pinch = UIPinchGestureRecognizer(target: self, action: #selector(VC.pinch))
self.views.addGestureRecognizer(pinch)

在觸發的method pan中傳入值UIPanGestureRecognizer的參數：

• .state:縮放的狀態，有.changed、.began、.ended
• .scale:縮放的比例

Rotation

在viewdidload()中加入以下程式碼

let rotation = UIRotationGestureRecognizer(target: self, action: #selector(VC.rotation))
self.views.addGestureRecognizer(rotation)

在觸發的method pan中傳入值UIPanGestureRecognizer的參數rotation為旋轉的弧度。