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iOS開發(fā)之手勢(shì)識(shí)別實(shí)例

 更新時(shí)間:2016年11月23日 10:37:55   作者:青玉伏案  
本篇文章主要介紹了iOS開發(fā)之手勢(shì)識(shí)別實(shí)例,具有一定的參考價(jià)值,有需要的可以了解一下。

感覺有必要把iOS開發(fā)中的手勢(shì)識(shí)別做一個(gè)小小的總結(jié)。下面會(huì)先給出如何用storyboard給相應(yīng)的控件添加手勢(shì),然后在用純代碼的方式給我們的控件添加手勢(shì),手勢(shì)的用法比較簡(jiǎn)單。和button的用法類似,也是目標(biāo) 動(dòng)作回調(diào),話不多說,切入今天的正題。

總共有六種手勢(shì)識(shí)別:輕擊手勢(shì)(TapGestureRecognizer),輕掃手勢(shì) (SwipeGestureRecognizer), 長按手勢(shì)(LongPressGestureRecognizer),  拖動(dòng)手勢(shì)(PanGestureRecognizer), 捏合手勢(shì)(PinchGestureRecognizer),旋轉(zhuǎn)手勢(shì)(RotationGestureRecognizer);

其實(shí)這些手勢(shì)用touche事件完全可以實(shí)現(xiàn),蘋果就是把常用的觸摸事件封裝成手勢(shì),來提供給用戶。讀者完全可以用TouchesMoved來寫拖動(dòng)手勢(shì)等

一,用storyboard給控件添加手勢(shì)識(shí)別

1.用storyboard添加手勢(shì)識(shí)別,和添加一個(gè)Button的步驟一樣,首先我們得找到相應(yīng)的手勢(shì),把手勢(shì)識(shí)別的控件拖到我們要添加手勢(shì)的控件中,截圖如下:
2.給我們拖出的手勢(shì)添加回調(diào)事件,和給Button回調(diào)事件沒啥區(qū)別的,在回調(diào)方法中添加要實(shí)現(xiàn)的業(yè)務(wù)邏輯即可,截圖如下:

二,純代碼添加手勢(shì)識(shí)別

用storyboard可以大大簡(jiǎn)化我們的操作,不過純代碼的方式還是要會(huì)的,就像要Dreamwear編輯網(wǎng)頁一樣(當(dāng)然啦,storyboard的拖拽功能要比Dreamwear的拖拽強(qiáng)大的多),用純代碼敲出來的更為靈活,更加便 于維護(hù)。不過用storyboard可以減少我們的工作量,這兩個(gè)要配合著使用才能大大的提高我們的開發(fā)效率。個(gè)人感覺用storyboard把框架搭起 來(Controller間的關(guān)系),一下小的東西還是用純代碼敲出來更好一些。下面就給出如何給我們的控件用純代碼的方式來添加手勢(shì)識(shí)別。

1.輕擊手勢(shì)(TapGestureRecognizer)的添加

初始化代碼TapGestureRecongnizer的代碼如下:

//新建tap手勢(shì)
 UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)];
 //設(shè)置點(diǎn)擊次數(shù)和點(diǎn)擊手指數(shù)
 tapGesture.numberOfTapsRequired = 1; //點(diǎn)擊次數(shù)
 tapGesture.numberOfTouchesRequired = 1; //點(diǎn)擊手指數(shù)
 [self.view addGestureRecognizer:tapGesture];

在回調(diào)方法中添加相應(yīng)的業(yè)務(wù)邏輯:

//輕擊手勢(shì)觸發(fā)方法
-(void)tapGesture:(id)sender
{
 //輕擊后要做的事情  
}

2.長按手勢(shì)(LongPressGestureRecognizer)
初始化代碼:

//添加長摁手勢(shì)
 UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesture:)];
 //設(shè)置長按時(shí)間
 longPressGesture.minimumPressDuration = 0.5; //(2秒)
 [self.view addGestureRecognizer:longPressGesture];

在對(duì)應(yīng)的回調(diào)方法中添加相應(yīng)的方法(當(dāng)手勢(shì)開始時(shí)執(zhí)行):

//常摁手勢(shì)觸發(fā)方法
-(void)longPressGesture:(id)sender
{
 UILongPressGestureRecognizer *longPress = sender;
 if (longPress.state == UIGestureRecognizerStateBegan)
 {
  UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"長按觸發(fā)" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles: nil];
  [alter show];
 }
}

代碼說明:手勢(shì)的常用狀態(tài)如下

  • 開始:UIGestureRecognizerStateBegan
  • 改變:UIGestureRecognizerStateChanged
  • 結(jié)束:UIGestureRecognizerStateEnded
  • 取消:UIGestureRecognizerStateCancelled
  • 失?。篣IGestureRecognizerStateFailed

3.輕掃手勢(shì)(SwipeGestureRecognizer)

在初始化輕掃手勢(shì)的時(shí)候得指定輕掃的方向,上下左右。 如果要要添加多個(gè)輕掃方向,就得添加多個(gè)輕掃手勢(shì),不過回調(diào)的是同一個(gè)方法。

添加輕掃手勢(shì),一個(gè)向左一個(gè)向右,代碼如下:

//添加輕掃手勢(shì)
 UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
 //設(shè)置輕掃的方向
 swipeGesture.direction = UISwipeGestureRecognizerDirectionRight; //默認(rèn)向右
 [self.view addGestureRecognizer:swipeGesture];
  
 //添加輕掃手勢(shì)
 UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
 //設(shè)置輕掃的方向
 swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft; //默認(rèn)向右
 [self.view addGestureRecognizer:swipeGestureLeft];

回調(diào)方法如下:

//輕掃手勢(shì)觸發(fā)方法
-(void)swipeGesture:(id)sender
{
 UISwipeGestureRecognizer *swipe = sender;
 if (swipe.direction == UISwipeGestureRecognizerDirectionLeft)
 {
  //向左輕掃做的事情
 }
 if (swipe.direction == UISwipeGestureRecognizerDirectionRight)
 {
  //向右輕掃做的事情
 }
}

4.捏合手勢(shì)(PinchGestureRecognizer)

捏合手勢(shì)初始化

//添加捏合手勢(shì)
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGesture:)];
[self.view addGestureRecognizer:pinchGesture];

捏合手勢(shì)要觸發(fā)的方法(放大或者縮小圖片):

////捏合手勢(shì)觸發(fā)方法
-(void) pinchGesture:(id)sender
{
  UIPinchGestureRecognizer *gesture = sender;
  
 //手勢(shì)改變時(shí)
 if (gesture.state == UIGestureRecognizerStateChanged)
 {
  //捏合手勢(shì)中scale屬性記錄的縮放比例
  _imageView.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale);
 }
  
 //結(jié)束后恢復(fù)
 if(gesture.state==UIGestureRecognizerStateEnded)
 {
  [UIView animateWithDuration:0.5 animations:^{
   _imageView.transform = CGAffineTransformIdentity;//取消一切形變
  }];
 }
}

5.拖動(dòng)手勢(shì)(PanGestureRecognizer)

拖動(dòng)手勢(shì)的初始化

//添加拖動(dòng)手勢(shì)
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
[self.view addGestureRecognizer:panGesture];

拖動(dòng)手勢(shì)要做的方法(通過translationInView獲取移動(dòng)的點(diǎn),和TouchesMoved方法類似)

//拖動(dòng)手勢(shì)
-(void) panGesture:(id)sender
{
 UIPanGestureRecognizer *panGesture = sender;
  
 CGPoint movePoint = [panGesture translationInView:self.view];
  
 //做你想做的事兒
}

6.旋轉(zhuǎn)手勢(shì)(RotationGestureRecognizer)

旋轉(zhuǎn)手勢(shì)的初始化

//添加旋轉(zhuǎn)手勢(shì)
UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGesture:)];
[self.view addGestureRecognizer:rotationGesture];

旋轉(zhuǎn)手勢(shì)調(diào)用的方法:

//旋轉(zhuǎn)手勢(shì)
-(void)rotationGesture:(id)sender
{
  
 UIRotationGestureRecognizer *gesture = sender;
  
 if (gesture.state==UIGestureRecognizerStateChanged)
 {
  _imageView.transform=CGAffineTransformMakeRotation(gesture.rotation);
 }
  
 if(gesture.state==UIGestureRecognizerStateEnded)
 {
   
  [UIView animateWithDuration:1 animations:^{
   _imageView.transform=CGAffineTransformIdentity;//取消形變
  }];
 }
  
}

上面的東西沒有多高深的技術(shù),就是對(duì)iOS開發(fā)中的手勢(shì)做了一下小小的總結(jié),溫故一下基礎(chǔ)知識(shí)。在之前的博客中也有用到手勢(shì)識(shí)別的內(nèi)容,就是沒有系統(tǒng)的梳理一下手勢(shì)識(shí)別的知識(shí),本文做一個(gè)基礎(chǔ)的補(bǔ)充吧。

以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。

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