iOS开发基础 - UITouch的使用

UITouch的使用
#pragma mark --touch触摸事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
#pragma mark --UITouch对象属性
//     因为单击时touches里面只有一个UITouch对象，所以可以用anyObject方法取里面存储的对象
    UITouch *touch = [touches anyObject];
//    记录点击时的事件，是一个时间戳
    NSTimeInterval time = touch.timestamp;
    NSLog(@"%f",time);

//    判断点击次数
    NSInteger count = touch.tapCount;
    NSLog(@"%ld",(long)count);

//   获取到我们点击的当前的view
    UIView *view00 = [touch view];
    NSLog(@"%@",view00);

//    - (CGPoint)locationInView:(UIView *)view;
//    - (CGPoint)previousLocationInView:(UIView *)view;
//    后面的参数说明坐标是相对于当前参数的坐标
    CGPoint prePoint = [touch previousLocationInView:self.view];

    NSLog(@"上一次点击时的坐标：%@",NSStringFromCGPoint(prePoint));

    CGPoint currentPoint = [touch locationInView:self.view];

    NSLog(@"当前点击的坐标：%@",NSStringFromCGPoint(currentPoint));

}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"ssss");
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"33333");
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

    UITouch *touch = [touches anyObject];

    CGPoint prePoint = [touch previousLocationInView:self.view];

    NSLog(@"上一次点击时的坐标：%@",NSStringFromCGPoint(prePoint));

    CGPoint currentPoint = [touch locationInView:self.view];

    NSLog(@"当前点击的坐标：%@",NSStringFromCGPoint(currentPoint));

    CGPoint pointDelt = CGPointMake(currentPoint.x-prePoint.x, currentPoint.y-prePoint.y);

    CGPoint center = CGPointMake(_myView.center.x+pointDelt.x, _myView.center.y+pointDelt.y);

    [_myView setCenter:center];
}


UIGesture手势


#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>

@property (nonatomic,strong) UIImageView *imageV;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.imageV = [[UIImageView alloc]initWithFrame:CGRectMake(100, 200, 100, 100)];
    self.imageV.image = [UIImage imageNamed:@"yellow"];
    self.imageV.userInteractionEnabled = YES;
    [self.view addSubview:self.imageV];
    //command + option

//    [self createTap];

//    [self createLongPress];

//    [self createPan];

    [self createPinch];

    [self createRotation];

//    [self createSwipe];
}
//手势 用来描述手指与屏幕具体的接触
- (void)createTap{

   //UIGestureRecognizer 这是一个手势类  是一个抽象基类 通常我们不会直接使用这个类 而是使用它的子类

    //点击手势
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapImage:)];

    //默认就是1
    //点击几次
    tap.numberOfTapsRequired = 1;
    //需要几个手指
    tap.numberOfTouchesRequired = 1;
    //手势需要添加到某个视图上
    [self.imageV addGestureRecognizer:tap];
}

- (void)tapImage:(UITapGestureRecognizer *)tap{
    NSLog(@"点击了");
    //当前点击的视图
    UIImageView *imagV = (id)tap.view;
}
//长按手势
- (void)createLongPress{
    //长安手势
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressImage:)];

    //最短长按时间
    longPress.minimumPressDuration = 2.0;

    [self.imageV addGestureRecognizer:longPress];
}

- (void)longPressImage:(UILongPressGestureRecognizer *)press{
    NSLog(@"长按");
}

//滑动手势
- (void)createPan{
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panImage)];

    [self.imageV addGestureRecognizer:pan];
}
- (void)panImage{
    NSLog(@"滑动");
}
//缩放
- (void)createPinch{

    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchImage:)];
    //设置代理
    pinch.delegate = self;

    [self.imageV addGestureRecognizer:pinch];
}
- (void)pinchImage:(UIPinchGestureRecognizer *)pinch{

    //缩放系数pinch.scale
    self.imageV.transform = CGAffineTransformScale(self.imageV.transform, pinch.scale, pinch.scale);
    //重置缩放系数 否则缩放系数会叠加
    pinch.scale = 1.0;
//    CGAffineTransformMakeScale(<#CGFloat sx#>, <#CGFloat sy#>)
}
//旋转
- (void)createRotation{

    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationImage:)];
    rotation.delegate = self;
    [self.imageV addGestureRecognizer:rotation];
}
- (void)rotationImage:(UIRotationGestureRecognizer *)rotation{
    //rotation.rotation旋转的角度
    self.imageV.transform = CGAffineTransformRotate(self.imageV.transform, rotation.rotation);
    //重置旋转角度 否则会叠加
    rotation.rotation = 0;
}
//轻扫
- (void)createSwipe{

    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeImage:)];

    //轻扫方向
    swipe.direction = UISwipeGestureRecognizerDirectionRight;
    /*
     UISwipeGestureRecognizerDirectionRight = 1 << 0,
     UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
     UISwipeGestureRecognizerDirectionUp    = 1 << 2,
     UISwipeGestureRecognizerDirectionDown  = 1 <<
     */

    [self.imageV addGestureRecognizer:swipe];
}

- (void)swipeImage:(UISwipeGestureRecognizer *)swipe{

    self.imageV.center = CGPointMake(self.imageV.center.x + 10, self.imageV.center.y);
}
//是否允许添加多个手势
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    //如需添加多个手势 判断手势所在的view是不是一个view
    if (gestureRecognizer.view == otherGestureRecognizer.view) {
        return YES;
    }
    return NO;
}
@end