我的iOS 学习 - 学习基本手势

iOS设计手势符合人的操作习惯，提供了良好的用户体验。

UIGestureRecognizer 手势抽象类，实现类 ：

1. UITapGestureRecognizer  轻击
2. UILongPressGestureRecognizer  长按
3. UISwipeGestureRecognizer  轻扫
4. UIPanGestureRecognizer  拖动
5. UIPinchGestureRecognizer  捏合缩放
6. UIRotationGestureRecognizer  旋转

下面是示例，简单的创建一个view，测试使用手势

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3     // Do any additional setup after loading the view, typically from a nib.
 4
 5     UIView *view = [[UIView alloc] initWithFrame:CGRectMake(20, 100, 300, 300) ];
 6     view.backgroundColor = [UIColor greenColor];
 7
 8     /** tap 轻击手势 **/
 9     /**
10     UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(changeBackgroundByTap:)]; //tap 手势
11     tapGesture.numberOfTapsRequired = 2; // tap触发次数
12     tapGesture.numberOfTouchesRequired = 2; // tap手指数
13
14     [view addGestureRecognizer:tapGesture]; //view 增加手势
15     **/
16
17     /** longPress 长按手势 **/
18     /**
19     UILongPressGestureRecognizer *longpressGresture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(changeBackgroundByLongPress:)];
20
21     [view addGestureRecognizer:longpressGresture];
22     **/
23
24     /** swipe 亲扫手势 **/
25     /**
26     UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(changeBackgroundBySwipe:)];
27     swipeGesture.direction = UISwipeGestureRecognizerDirectionDown; // 轻扫方向
28
29      [view addGestureRecognizer:swipeGesture];
30     **/
31
32     /** pan 拖动手势 **/
33     /**
34     UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
35
36     [view addGestureRecognizer:panGesture];
37     **/
38
39     /** pinch 缩放手势 **/
40     /**
41     UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
42
43     [view addGestureRecognizer:pinchGesture];
44     **/
45
46     /** rotation 旋转手势 **/
47     UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
48
49     [view addGestureRecognizer:rotationGesture];
50
51     [self.view addSubview: view];
52 }

手势对应 action

 1 #pragma mark -
 2 #pragma mark  tap 轻击手势
 3 - (void)changeBackgroundByTap:(UITapGestureRecognizer *)tapGesture {
 4     UIView *view = tapGesture.view; //取得手势作用的view视图
 5     view.backgroundColor = [UIColor colorWithRed:arc4random() % 256 /255.0 green:arc4random() % 256 /255.0 blue:arc4random() % 256 /255.0 alpha:1.0];
 6 }
 7
 8 #pragma mark -
 9 #pragma mark  longPress 长按手势
10 - (void) changeBackgroundByLongPress:(UILongPressGestureRecognizer *)longPressGesture {
11     UIView *view = longPressGesture.view;
12
13     // 这里判断状态，不然会调用两次
14     if (longPressGesture.state == UIGestureRecognizerStateBegan) {
15         view.backgroundColor = [UIColor colorWithRed:arc4random() % 256 /255.0 green:arc4random() % 256 /255.0 blue:arc4random() % 256 /255.0 alpha:1.0];
16     }
17 }
18
19 #pragma mark -
20 #pragma mark  swipe 轻扫手势
21 - (void) changeBackgroundBySwipe:(UISwipeGestureRecognizer *)swipeGesture {
22     UIView *view = swipeGesture.view;
23     view.backgroundColor = [UIColor colorWithRed:arc4random() % 256 /255.0 green:arc4random() % 256 /255.0 blue:arc4random() % 256 /255.0 alpha:1.0];
24 }
25
26 #pragma mark -
27 #pragma mark  pan 拖动手势
28 - (void) panAction:(UIPanGestureRecognizer *)panGesture {
29     UIView *view = panGesture.view;
30     CGPoint offset = [panGesture translationInView:view];
31     NSLog(@"pan 位移 = %@", NSStringFromCGPoint(offset));
32
33     view.transform = CGAffineTransformMakeTranslation(offset.x, offset.y); // 设置transfrom实现手势拖动，
34 }
35
36 #pragma mark -
37 #pragma mark  pinch 缩放手势
38 - (void) pinchAction:(UIPinchGestureRecognizer *)pinchGesture {
39     CGFloat pinchScale = pinchGesture.scale;
40     NSLog(@"pinchSale 缩放比例 = %f", pinchScale);
41
42     pinchGesture.view.transform = CGAffineTransformMakeScale(pinchScale, pinchScale); //设置transform实现手势缩放
43 }
44
45 #pragma mark -
46 #pragma mark  rotation 旋转手势
47 - (void) rotationAction:(UIRotationGestureRecognizer *)rotationGesture {
48     CGFloat rotation = rotationGesture.rotation; // 旋转弧度
49     NSLog(@"rotation 弧度 = %f", rotation);
50
51     rotationGesture.view.transform = CGAffineTransformMakeRotation(rotation); //设置transform实现手势旋转
52 }

以上是iOS手势的基本操作，视图的transform涉及到动画的知识，还在学习中。。。