手势的应用

 

Main.storyboard

手势的应用_第1张图片

 

1.敲击手势

ViewController.m

#import "ViewController.h"

 

@interface ViewController ()<UIGestureRecognizerDelegate>

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //1.创建一个敲击手势对象

    UITapGestureRecognizer *tapGest = [[UITapGestureRecognizer alloc] init];

    //2.创建敲击手势对象的属性

    //点击的次数

    tapGest.numberOfTapsRequired = 1;

    //手指的数量

//    tapGest.numberOfTouchesRequired = 2;

    //设置代理

    tapGest.delegate = self;

    //3.把手势添加到view

    [self.imageView addGestureRecognizer:tapGest];

    

    //4.设置手势的监听方法

    [tapGest addTarget:self action:@selector(tapView:)];

}

 

-(void)tapView:(UITapGestureRecognizer *)tapGest

{

    NSLog(@"%s", __func__);

}

#pragma mark 手势的代理

//告诉view能否接收触摸事件

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{

    //左边可以 点击/右边不可以

    CGPoint location = [touch locationInView:touch.view];

    if (location.x <= touch.view.bounds.size.width * 0.5) {

        return YES;

    }

    return NO;

}

 

@end

2.长按手势

ViewController.m

#import "ViewController.h"

 

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //给图片添加长按手势对象

    //1.创建一个"长按手势"对象

    UILongPressGestureRecognizer *longGest = [[UILongPressGestureRecognizer alloc] init];

    //属性

    //长按的时间

    longGest.minimumPressDuration = 3;

    //长按是,距离触摸点可移动的距离

    longGest.allowableMovement = 30;

    //2.把手势添加到view

    [self.imageView addGestureRecognizer:longGest];

    //3.设置手势的监听方法

    [longGest addTarget:self action:@selector(longPressView:)];

    

}

 

-(void)longPressView:(UILongPressGestureRecognizer *)longPressGest{

    //怎么判断长按开始和结束

    NSLog(@"%s 手势状态 %ld",  __func__, longPressGest.state);

    if (longPressGest.state == UIGestureRecognizerStateBegan) {

        NSLog(@"长按手势开始");

    }else{

        NSLog(@"长按手势结束");

    }

    

    

}

 

@end

 

3.轻扫手势

ViewController.m

#import "ViewController.h"

 

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //给图片添加轻扫手势对象

    //1.创建一个"轻扫手势"对象

    UISwipeGestureRecognizer *swipeGest = [[UISwipeGestureRecognizer alloc] init];

    //属性

    swipeGest.direction = UISwipeGestureRecognizerDirectionRight;//默认方向

//    UISwipeGestureRecognizerDirectionRight = 1 << 0,向右轻扫

//    UISwipeGestureRecognizerDirectionLeft  = 1 << 1,向左轻扫

//    UISwipeGestureRecognizerDirectionUp    = 1 << 2,向上轻扫

//    UISwipeGestureRecognizerDirectionDown  = 1 << 3,向下

    //2.把手势添加到view

    [self.imageView addGestureRecognizer:swipeGest];

    //3.设置手势的监听方法

    [swipeGest addTarget:self action:@selector(swipeGestView:)];

    

}

 

-(void)swipeGestView:(UISwipeGestureRecognizer *)swipeGest{

    //“轻扫的状态不需要判断,因为只有结束状态。 只有长按的状态去判断。

    NSLog(@"%s 手势状态 %ld",  __func__, swipeGest.state);

//    if (swipeGest.state == UIGestureRecognizerStateBegan) {

//        NSLog(@"轻扫手势开始");

//    }else{

//        NSLog(@"轻扫手势结束");

//    }

}

 

4.捏合手势

#import "ViewController.h"

 

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    /**

     * 默认情况下,控制只能 监听到一种手势

     * 如果要监听到多个手势,设置一个代理的方法,告知它允许多个手势并存

     */

    //给图片添加捏合手势对象

    //1.创建一个"捏合手势"对象

    UIPinchGestureRecognizer *pinchGest = [[UIPinchGestureRecognizer alloc] init];

    //属性

    

    

   

    //2.把手势添加到view

    [self.imageView addGestureRecognizer:pinchGest];

    //3.设置手势的监听方法

    [pinchGest addTarget:self action:@selector(pinchGestView:)];

    

 

}

 

-(void)pinchGestView:(UIPinchGestureRecognizer *)pinchGest{

    //缩放的比例是一个累加的过程

    NSLog(@"%s 缩放的比例 %f", __func__,pinchGest.scale);

    //设置图片的缩放

    //10*10 / 1.0

    //10*2.01*10*2.01/1.01+1.0 = 2.01

    //10*2.01*3.03 *10*2.01*3.03 /1.02 +2.01 = 3.03

#warning 放大图片后,再次缩放的时候,马上回到原先的大小

//    self.imageView.transform = CGAffineTransformMakeScale(pinchGest.scale, pinchGest.scale);

    

    self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinchGest.scale, pinchGest.scale);

    //让比例还原,不要累加

    //解决办法,重新设置scale 图片就不会消失

    pinchGest.scale = 1;

    

}

 

5.旋转手势

ViewController.m

#import "ViewController.h"

 

@interface ViewController ()<UIGestureRecognizerDelegate>

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //给图片添加旋转手势对象

    //1.创建一个旋转手势对象

    UIRotationGestureRecognizer *rotationGest = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationView:)];

    //属性

    //设置代理

    rotationGest.delegate = self;

    //2.把手势添加到view

    [self.imageView addGestureRecognizer:rotationGest];

    //给图片添加捏合手势

    UIPinchGestureRecognizer *pinchGest = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];

    [self.imageView addGestureRecognizer:pinchGest];

}

 

-(void)rotationView:(UIRotationGestureRecognizer *)rotationGest{

    //旋转角度

    //旋转的角度也是一个累加的过程

    NSLog(@"旋转角度%f", rotationGest.rotation);

    

    //设置图片的旋转

    self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotationGest.rotation);

    //    //清除旋转角度的累加

    rotationGest.rotation = 0;

}

 

-(void)pinchView:(UIPinchGestureRecognizer *)pinchGest{

    //设置图片

    self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinchGest.scale, pinchGest.scale);

    //还原

    pinchGest.scale = 1;

}

 

#pragma mark 手势代理

//Simultaneous 同时发生

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{

    return YES;

}

 

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

 

@end

6.拖曳手势

#import "ViewController.h"

 

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //给图片添加拖拽手势

    //1.创建一个"拖拽手势"对象

//    UIPanGestureRecognizer *panGest = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];

//    //添加手势

//    [self.imageView addGestureRecognizer:panGest];

}

 

-(IBAction)panView:(UIPanGestureRecognizer *)panGest{

    //方法

    

    //panGest.view触摸的view

    //拖拽的距离 累加的过程 获取的是距离

    CGPoint trans =[panGest translationInView:panGest.view];

    NSLog(@"%@", NSStringFromCGPoint(trans));

    

    //设置图片移动

    CGPoint center = self.imageView.center;

    center.x += trans.x;

    center.y += trans.y;

    self.imageView.center = center;

    

    //清除添加

    [panGest setTranslation:CGPointZero inView:panGest.view];

    

}

 

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

上面几种方法都是用代码写,现在用Main.storyboard

手势的应用_第2张图片

 

就是在图片上添加手势,前提是,图片是可交互的

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