ios 获取手势的点 iphone手势意思

手势识别在 iOS 中非常重要，他极大地提高了移动设备的使用便捷性。

一、介绍

1、iOS 系统在 3.2 以后，他提供了一些常用的手势（UIGestureRecognizer 的子类），开发者可以直接使用他们进行手势操作。

• UIPanGestureRecognizer（拖动）
• UIPinchGestureRecognizer（捏合）
• UIRotationGestureRecognizer（旋转）
• UITapGestureRecognizer（点按）
• UILongPressGestureRecognizer（长按）
• UISwipeGestureRecognizer（轻扫）

在六种手势识别中，只有一种手势是离散型手势，他就是 UITapGestureRecognizer。

离散型手势的特点就是：一旦识别就无法取消，而且只会调用一次手势操作事件（初始化手势时指定的回调方法）。

换句话说其他五种手势是连续型手势，而连续型手势的特点就是：会多次调用手势操作事件，而且在连续手势识别后可以取消手势。

2、手势的枚举：

typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {
      UIGestureRecognizerStatePossible,   // 尚未识别是何种手势操作（但可能已经触发了触摸事件），默认状态
      UIGestureRecognizerStateBegan,      // 手势已经开始，此时已经被识别，但是这个过程中可能发生变化，手势操作尚未完成
     UIGestureRecognizerStateChanged,   // 手势状态发生转变
      UIGestureRecognizerStateEnded,      // 手势识别操作完成（此时已经松开手指）
     UIGestureRecognizerStateCancelled, // 手势被取消，恢复到默认状态
     UIGestureRecognizerStateFailed,    // 手势识别失败，恢复到默认状态
      UIGestureRecognizerStateRecognized= UIGestureRecognizerStateEnded // 手势识别完成，同UIGestureRecognizerStateEnded

3、使用手势的步骤

使用手势很简单，分为三步：

（1）创建手势识别器对象实例。创建时，指定一个回调方法，当手势开始，改变、或结束时，执行回调方法。

（2）设置手势识别器对象实例的相关属性（可选部分）

（3）添加到需要识别的 View 中。每个手势只对应一个 View，当屏幕触摸在 View 的边界内时，如果手势和预定的一样，那就会执行回调方法。

二、代码示例

#import "ViewController.h"
#import "NextViewController.h"

@interface ViewController ()
{
    UIImageView *imageView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor grayColor];
    
    imageView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 40, 100, 200)];
    
    [self.view addSubview:imageView];
    
    //    点击手势
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tick:)];
    //    手指点击屏幕的次数
    tap.numberOfTapsRequired = 1;
    //    几个手指点击
    tap.numberOfTouchesRequired = 1;
    [self.view addGestureRecognizer:tap];
    
    //    长按
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(loagPress:)];
    //    最少按多少秒
    longPress.minimumPressDuration = 3;
    [self.view addGestureRecognizer:longPress];
    
    //    轻扫
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];
    //    轻扫的方向
    swipe.direction = UISwipeGestureRecognizerDirectionLeft;
    [self.view addGestureRecognizer:swipe];
    
    
    //    拖动
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];
    [pan requireGestureRecognizerToFail:swipe];
    [self.view addGestureRecognizer:pan];
    
    //    捏合
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinch:)];
    
    [self.view addGestureRecognizer:pinch];
    
    //    旋转
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotation:)];
    rotation.rotation = 1;
    [self.view addGestureRecognizer:rotation];
}

- (void)tick:(UITapGestureRecognizer *)tap
{
//  6、再出始化  这个对象的  地方  挂上代理
//    NextViewController *next = [[NextViewController alloc]init];
//    next.delegate = self;
//    
//    [self presentViewController:next animated:YES completion:nil];
    
    
    imageView.transform = CGAffineTransformIdentity;
    //    获取点击屏幕的位置
    NSLog(@"tap%f   %f",[tap locationInView:self.view].x,[tap locationInView:self.view].y);
    
    imageView.image = [UIImage imageNamed:@"yu.jpg"];
    imageView.alpha = 1;
    imageView.center = [tap locationInView:self.view];
    [UIView animateWithDuration:0.5 animations:^{
        imageView.alpha = 0.01;
    }];
}

- (void)mmmmmm
{
    imageView.image = [UIImage imageNamed:@"yu.jpg"];
    imageView.alpha = 1;
}

- (void)loagPress:(UILongPressGestureRecognizer *)longPress
{
    NSLog(@"longPress%f   %f",[longPress locationInView:self.view].x,[longPress locationInView:self.view].y);
}

- (void)swipe:(UISwipeGestureRecognizer *)swipe
{
    NSLog(@"swipe%f   %f",[swipe locationInView:self.view].x,[swipe locationInView:self.view].y);
    
    self.view.frame = CGRectMake(self.view.bounds.size.width, 0, self.view.bounds.size.width, self.view.bounds.size.height);
    [UIView animateWithDuration:0.8 animations:^{
        self.view.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height);
    }];
}

- (void)pan:(UIPanGestureRecognizer *)pan
{
    //    获取拖动的位置
    imageView.image = [UIImage imageNamed:@"yu.jpg"];
    imageView.alpha = 1;
    imageView.center = [pan locationInView:self.view];
    
}

- (void)pinch:(UIPinchGestureRecognizer *)pinch
{
    imageView.image = [UIImage imageNamed:@"yu.jpg"];
    imageView.alpha = 1;
    
    imageView.transform = CGAffineTransformScale(imageView.transform, pinch.scale, pinch.scale);
    //    捏合的变化规模
    pinch.scale = 1;
    
}

- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
    
    imageView.image = [UIImage imageNamed:@"yu.jpg"];
    imageView.alpha = 1;
    
    //    使旋转手势上的视图旋转变化
    imageView.transform = CGAffineTransformMakeRotation(rotation.rotation);
    
}