iOS开发之UI手势

基础手势

@property (nonatomic,strong)UIImageView *imageView;//该方法是一个懒加载，在需要的地方才调用，节省内存- (UIImageView *)imageView{//方法名要与属性相同    if (!_imageView) {        _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 70, self.view.bounds.size.width-40, self.view.bounds.size.height/2)];        _imageView.image = [UIImage imageNamed:@"1.jpg"];    }    return _imageView;}- (void)viewDidLoad {    [super viewDidLoad];    [self.view addSubview:self.imageView];//此处相当于调用了懒加载方法    //开启交互事件的响应，默认为NO    _imageView.userInteractionEnabled = YES;    //添加手势对象    /**     UITapGestureRecognizer 点按手势    参数1:响应事件拥有者，self表示当前视图控制器    参数2:响应事件方法，tapOneAction:     */    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOneAction:)];    //表示识别事件的类型:几次点击触发，默认值是1    tapGesture.numberOfTapsRequired = 1;    //几个手指点击时触发事件    tapGesture.numberOfTouchesRequired = 1;    //把手势添加到视图里面，视图可以响应事件    [_imageView addGestureRecognizer:tapGesture];    //添加双击手势    UITapGestureRecognizer *tapGesture2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapTwoAction:)];    tapGesture2.numberOfTapsRequired = 2;//点击两次才触发事件    tapGesture2.numberOfTouchesRequired = 1;    [_imageView addGestureRecognizer:tapGesture2];    //当单击操作遇到双击操作的时候，使单击操作失败（tapGesture）    [tapGesture requireGestureRecognizerToFail:tapGesture2];  }//单击事件响应方法，这里使图片放大，即改变imageView的frame- (void)tapOneAction:(UITapGestureRecognizer *)gesture{    NSLog(@"单击");    //获取手势监控的视图，在该imageView外面不能触发    UIImageView *imageView = (UIImageView *)gesture.view;    //开始动画    [UIView beginAnimations:nil context:nil];    //设置动画时间    [UIView setAnimationDuration:2];    //放大图片    imageView.frame = self.view.bounds； }//双击事件响应方法，这里使图片缩小为原来的大小- (void)tapTwoAction:(UITapGestureRecognizer *)gesture{    [UIView beginAnimations:nil context:nil];    [UIView setAnimationDuration:2];    //设置_imageView为初始的frame    _imageView.frame = CGRectMake(20, 70, self.view.bounds.size.width-40, self.view.bounds.size.height/2);    //提交动画    [UIView commitAnimations]; }

高级手势

#import "ViewController.h"@interface ViewController ()<UIGestureRecognizerDelegate>//UIGestureRecognizerDelegate 同时进行旋转、缩放的协议@property (nonatomic,strong)UIImageView *imageView;//定义一个缩放手势手势，用来对视图进行放大缩小//捏合手势@property (nonatomic,strong)UIPinchGestureRecognizer *pinGesture;//旋转手势@property (nonatomic,strong)UIRotationGestureRecognizer *rotationGesture;@end@implementation ViewController//懒加载- (UIImageView *)imageView {    if (!_imageView) {        _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 70, self.view.bounds.size.width-40, self.view.bounds.size.height/2)];        _imageView.image = [UIImage imageNamed:@"2.jpg"];    }    return _imageView;}- (void)viewDidLoad {    [super viewDidLoad];    [self.view addSubview:self.imageView];    //开启交互    _imageView.userInteractionEnabled = YES;    //创建一个捏合手势    _pinGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinGesture:)];    [_imageView addGestureRecognizer:_pinGesture];    //创建一个旋转手势    _rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];    [_imageView addGestureRecognizer:_rotationGesture];    //设置两种手势的代理为self    _pinGesture.delegate = self;    _rotationGesture.delegate = self;}//实现协议的方法//是否可以同时响应两个手势- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {//Simultaneously 同时的    //如果返回YES，可以同时响应    return YES;}- (void)pinGesture:(UIPinchGestureRecognizer *)gesture {    //获取监控图像视图    UIImageView *imgView = (UIImageView *)gesture.view;    //对图像视图对象进行矩阵计算并且赋值    //transform：表示图像学中的变换矩阵    //CGAffineTransformScale：通过缩放产生一个新的矩阵（在原来的基础上）    //p1:原来的矩阵    //p2:x方向缩放的比例    //p3:y方向缩放的比例    imgView.transform = CGAffineTransformScale(imgView.transform, gesture.scale, gesture.scale);    //返回的是新的缩放之后变化矩阵的比例    gesture.scale = 1;}- (void)rotationAction:(UIRotationGestureRecognizer *)rotationGesture {    //获取监控图像视图    UIImageView *imgView = (UIImageView *)rotationGesture.view;    imgView.transform = CGAffineTransformRotate(imgView.transform, rotationGesture.rotation);    //对角度进行清零    rotationGesture.rotation = 0;}

扩展手势

@interface ViewController ()<UINavigationControllerDelegate, UIImagePickerControllerDelegate>@property (nonatomic,strong)UIImageView *imageView;@end@implementation ViewController- (UIImageView *)imageView {    if (!_imageView) {        _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 70, self.view.bounds.size.width-40, self.view.bounds.size.height/2)];        _imageView.image = [UIImage imageNamed:@"2.jpg"];    }    return _imageView;}- (void)viewDidLoad {    [super viewDidLoad];    [self.view addSubview:self.imageView];    _imageView.userInteractionEnabled = YES;    //创建一个平移手势    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];    //添加手势    [_imageView addGestureRecognizer:panGesture];    //创建一个轻扫手势    UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];    swipeGesture.direction = UISwipeGestureRecognizerDirectionUp;    [_imageView addGestureRecognizer:swipeGesture];    //创建一个长按手势    UILongPressGestureRecognizer *longGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longAction:)];    //设置长按手势的时间，默认0.5秒为长按手势    longGesture.minimumPressDuration = 1.0;    [_imageView addGestureRecognizer:longGesture];}//平移手势//只要手指在屏幕坐标上发生变化的时候就会调用该方法- (void)panAction:(UIPanGestureRecognizer *)panGesture {//    NSLog(@"平移手势");//    //获得移动的坐标，相对于视图的坐标系    CGPoint point = [panGesture translationInView:self.view];//translation 平移    _imageView.center = CGPointMake(_imageView.center.x + point.x, _imageView.center.y + point.y);    //在指定视图的坐标系中设置平移值    [panGesture setTranslation:CGPointZero inView:self.view];//    NSLog(@"point.x = %f,point.y = %f",point.x,point.y);//    //获取平移时的相对速度(每秒在屏幕上滑动移动像素的值)    CGPoint pv = [panGesture velocityInView:self.view];//    NSLog(@"pv.x = %.2f,pv.y = %.2f",pv.x,pv.y);}//轻扫手势- (void)swipeAction:(UISwipeGestureRecognizer *)swipeGesture {    NSLog(@"向上");}//长按手势- (void)longAction:(UILongPressGestureRecognizer *)longGesture {    if (longGesture.state == UIGestureRecognizerStateBegan) {        NSLog(@"开始状态");        UIAlertController *alertC = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];        UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"保存到相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {            NSLog(@"保存到相册");            UIImageWriteToSavedPhotosAlbum(_imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);        }];        [alertC addAction:action1];        UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"打开相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {            NSLog(@"打开相册");            /**             sourceType:             UIImagePickerControllerSourceTypePhotoLibrary,    图片列表             UIImagePickerControllerSourceTypeCamera,          摄像头             UIImagePickerControllerSourceTypeSavedPhotosAlbum 相册             */            UIImagePickerController *picker = [[UIImagePickerController alloc] init];            //资源类型            picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;            picker.delegate = self;            //选择图片后是否可以被编辑            picker.allowsEditing = YES;            //推送picker控制器            [self presentViewController:picker animated:YES completion:nil];        }];        [alertC addAction:action2];        UIAlertAction *action3 = [UIAlertAction actionWithTitle:@"打开相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {            NSLog(@"打开相机");            //要使用真机来测试            UIImagePickerController *picker = [[UIImagePickerController alloc] init];            picker.sourceType = UIBarButtonSystemItemCamera;            picker.delegate = self;            picker.allowsEditing = YES;            [self presentViewController:picker animated:YES completion:nil];        }];        [alertC addAction:action3];        UIAlertAction *action4 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {            NSLog(@"取消");        }];        [alertC addAction:action4];        //推出alertC！！        [self presentViewController:alertC animated:YES completion:^{        }];    }    else if (longGesture.state == UIGestureRecognizerStateEnded){        NSLog(@"结束状态");    }    NSLog(@"长按");}//保存图片方法- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{    if (!error) {        NSLog(@"图片保存成功");    }    else {        NSLog(@"图片保存失败");    }}#pragma mark --UIImagePickerControllerDelegate--- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {    if (picker.sourceType == UIImagePickerControllerSourceTypePhotoLibrary) {        NSLog(@"%@",info);        //照片的原始数据        _imageView.image = info[UIImagePickerControllerOriginalImage];        //退出picker！！！    }    else if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {        _imageView.image = info[UIImagePickerControllerOriginalImage];    }    [picker dismissViewControllerAnimated:YES completion:nil];}//- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {//    //    NSLog(@"取消");//}@end