感覺(jué)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)。在上一篇iOS開發(fā)之自定義表情鍵盤(組件封裝與自動(dòng)布局)博客中用到了一個(gè)輕擊手勢(shì),就是在輕擊TextView時(shí)從表情鍵盤回到系統(tǒng)鍵盤,在TextView中的手是用storyboard添加的。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(shuō),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(zhǎng)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(lái)提供給用戶。讀者完全可以用TouchesMoved來(lái)寫拖動(dòng)手勢(shì)等
一,用storyboard給控件添加手勢(shì)識(shí)別,當(dāng)然啦用storyboard得截張圖啦
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(méi)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(guò)純代碼的方式還是要會(huì)的,就像要Dreamwear編輯網(wǎng)頁(yè)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(lái)的更為靈活,更加便于維護(hù)。不過(guò)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(jué)用storyboard把框架搭起來(lái)(Controller間的關(guān)系),一下小的東西還是用純代碼敲出來(lái)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(lái)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:
1 //新建tap手勢(shì)
2 UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)];
3 //設(shè)置點(diǎn)擊次數(shù)和點(diǎn)擊手指數(shù)
4 tapGesture.numberOfTapsRequired = 1; //點(diǎn)擊次數(shù)
5 tapGesture.numberOfTouchesRequired = 1; //點(diǎn)擊手指數(shù)
6 [self.view addGestureRecognizer:tapGesture];
在回調(diào)方法中添加相應(yīng)的業(yè)務(wù)邏輯:
1 //輕擊手勢(shì)觸發(fā)方法
2 -(void)tapGesture:(id)sender
3 {
4 //輕擊后要做的事情
5 }
2.長(zhǎng)按手勢(shì)(LongPressGestureRecognizer)
初始化代碼:
1 //添加長(zhǎng)摁手勢(shì)
2 UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesture:)];
3 //設(shè)置長(zhǎng)按時(shí)間
4 longPressGesture.minimumPressDuration = 0.5; //(2秒)
5 [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):
1 //常摁手勢(shì)觸發(fā)方法 2 -(void)longPressGesture:(id)sender 3 { 4 UILongPressGestureRecognizer *longPress = sender; 5 if (longPress.state == UIGestureRecognizerStateBegan) 6 { 7 UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"長(zhǎng)按觸發(fā)" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles: nil]; 8 [alter show]; 9 } 10 } |
代碼說(shuō)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
失敗:UIGestureRecognizerStateFailed
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(guò)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:
1 //添加輕掃手勢(shì)
2 UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
3 //設(shè)置輕掃的方向
4 swipeGesture.direction = UISwipeGestureRecognizerDirectionRight; //默認(rèn)向右
5 [self.view addGestureRecognizer:swipeGesture];
6
7 //添加輕掃手勢(shì)
8 UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
9 //設(shè)置輕掃的方向
10 swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft; //默認(rèn)向右
11 [self.view addGestureRecognizer:swipeGestureLeft];
回調(diào)方法如下:
1 //輕掃手勢(shì)觸發(fā)方法 2 -(void)swipeGesture:(id)sender 3 { 4 UISwipeGestureRecognizer *swipe = sender; 5 if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) 6 { 7 //向左輕掃做的事情 8 } 9 if (swipe.direction == UISwipeGestureRecognizerDirectionRight) 10 { 11 //向右輕掃做的事情 12 } 13 } 14 |
4.捏合手勢(shì)(PinchGestureRecognizer)
捏合手勢(shì)初始化
1 //添加捏合手勢(shì)
2 UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGesture:)];
3 [self.view addGestureRecognizer:pinchGesture];
捏合手勢(shì)要觸發(fā)的方法(放大或者縮小圖片):
1 ////捏合手勢(shì)觸發(fā)方法 2 -(void) pinchGesture:(id)sender 3 { 4 UIPinchGestureRecognizer *gesture = sender; 5 6 //手勢(shì)改變時(shí) 7 if (gesture.state == UIGestureRecognizerStateChanged) 8 { 9 //捏合手勢(shì)中scale屬性記錄的縮放比例 10 _imageView.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale); 11 } 12 13 //結(jié)束后恢復(fù) 14 if(gesture.state==UIGestureRecognizerStateEnded) 15 { 16 [UIView animateWithDuration:0.5 animations:^{ 17 _imageView.transform = CGAffineTransformIdentity;//取消一切形變 18 }]; 19 } 20 } |
5.拖動(dòng)手勢(shì)(PanGestureRecognizer)
拖動(dòng)手勢(shì)的初始化
1 //添加拖動(dòng)手勢(shì)
2 UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
3 [self.view addGestureRecognizer:panGesture];
拖動(dòng)手勢(shì)要做的方法(通過(guò)translationInView獲取移動(dòng)的點(diǎn),和TouchesMoved方法類似)
1 //拖動(dòng)手勢(shì)
2 -(void) panGesture:(id)sender
3 {
4 UIPanGestureRecognizer *panGesture = sender;
5
6 CGPoint movePoint = [panGesture translationInView:self.view];
7
8 //做你想做的事兒
9 }
6.旋轉(zhuǎn)手勢(shì)(RotationGestureRecognizer)
旋轉(zhuǎn)手勢(shì)的初始化
1 //添加旋轉(zhuǎn)手勢(shì)
2 UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGesture:)];
3 [self.view addGestureRecognizer:rotationGesture];
旋轉(zhuǎn)手勢(shì)調(diào)用的方法:
1 //旋轉(zhuǎn)手勢(shì) 2 -(void)rotationGesture:(id)sender 3 { 4 5 UIRotationGestureRecognizer *gesture = sender; 6 7 if (gesture.state==UIGestureRecognizerStateChanged) 8 { 9 _imageView.transform=CGAffineTransformMakeRotation(gesture.rotation); 10 } 11 12 if(gesture.state==UIGestureRecognizerStateEnded) 13 { 14 15 [UIView animateWithDuration:1 animations:^{ 16 _imageView.transform=CGAffineTransformIdentity;//取消形變 17 }]; 18 } 19 20 } |
上面的東西沒(méi)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)。
English » | | | | | | | | |
Text-to-speech function is limited to 100 characters