UI初级连载十一-------触摸与手势

//当子视图超出自己的frame时，是否剪切子视图

self.clipsToBounds= YES;

//是否开启多点触控

self.multipleTouchEnabled= YES;

点击方法：

//手指开始点击视图是调用的方法

- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event;

//手指在视图上移动调用的方法

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

//手指离开视图时调用的方法

- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event;

//触摸事件被打断的时候调用多方法

- (void)touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event;

---

晃动方法：（摇一摇）

//开始晃动时调用的方法

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent*)event;

//结束晃动时调用的方法

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent*)event;

---

需要的对象：

//拿到一个touch对象

UITouch*touch = touches.anyObject;

//拿到点击的View

UIView*touchView = touch.view;

//拿到当前在view上的坐标

CGPointnowLocation = [touch locationInView:self];

//拿到上一次在view上的坐标

CGPointlastLocation = [touch previousLocationInView:self];

//拿到点击次数

NSIntegertapCount = touch.tapCount;

---

事件传递：

//分配事件所调用的方法

- (void)sendEvent:(UIEvent*)event;

响应者链：

响应者链表示一系列的响应者对象。时间被交由第一响应者对象处理，如果第一响应者不处理，事件被沿着响应者链向上传递，交给下一响应者（next responder）——— 具体参考UI09-05代码

手势识别器：

- (void)viewDidLoad {
    [superviewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
   
    UIView *gestureView = [[UIViewalloc]initWithFrame:CGRectMake(50,50,300,300)];
    gestureView.backgroundColor= [UIColorblackColor];

    [self.viewaddSubview:gestureView];

    /*------------------------点击手势-------------*/

    UITapGestureRecognizer *tap1 = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(tap1Action:)];
    //注意：一个点击手势，只能识别一种手势，单击和双击是不同的两个手势
    //设置点击的数量
    tap1.numberOfTapsRequired= 1;
    //设置点击的个数
    tap1.numberOfTouchesRequired= 1;
    //往gestureView上添加一个手势
    [gestureView addGestureRecognizer:tap1];
   
    UITapGestureRecognizer *tap2 = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(tap2Action:)];
    tap2.numberOfTapsRequired= 2;

    [gestureView addGestureRecognizer:tap2];

    //如果参数中的手势出发了，则自身失效

    [tap1 requireGestureRecognizerToFail:tap2];

   
    /*---------------轻扫手势-------------*/
    UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(swipe:)];
    //设置方向－－－向上轻扫

    swipeGesture.direction= UISwipeGestureRecognizerDirectionUp;

    [gestureView addGestureRecognizer:swipeGesture];

   
    /*---------------平移手势-------------*/
    //平移手势（滑动）
    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizeralloc]initWithTarget:selfaction:@selector(panAction:)];

    [gestureView addGestureRecognizer:panGesture];

   
    /*---------------长按手势-------------*/
    //长按手势
    UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizeralloc]initWithTarget:selfaction:@selector(longPress:)];
    //设置长安的最短时间
    longPressGesture.minimumPressDuration= 3;
    [gestureView addGestureRecognizer:longPressGesture];
   
    /*---------------旋转手势-------------*/
    //旋转手势
    UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizeralloc]initWithTarget:selfaction:@selector(rotation:)];
    [gestureView addGestureRecognizer:rotationGesture];
   
    /*----------捏合手势--------------*/
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizeralloc]initWithTarget:selfaction:@selector(pinchAction:)];
    [gestureView addGestureRecognizer:pinch];

}

//单击
- (void)tap1Action:(UITapGestureRecognizer*)tap1
{
    NSLog(@"单击");

}

//双击
- (void)tap2Action:(UITapGestureRecognizer*)tap2
{
    NSLog(@"双击");
}

//轻扫
- (void)swipe:(UISwipeGestureRecognizer*)swipe
{
    if (swipe.direction== UISwipeGestureRecognizerDirectionUp) {
        NSLog(@"向上清扫");
    }
}

//平移
- (void)panAction:(UIPanGestureRecognizer*)pan
{
    CGPoint p = [pan locationInView:pan.view];
    NSLog(@"%@",NSStringFromCGPoint(p));
}

//长按
- (void)longPress:(UILongPressGestureRecognizer*)longPress
{
    if (longPress.state== UIGestureRecognizerStateBegan) {
        NSLog(@"开始长按");
    }elseif (longPress.state== UIGestureRecognizerStateEnded) {
        NSLog(@"结束长按");
    }
}

//旋转
- (void)rotation:(UIRotationGestureRecognizer*)rotation
{
    //获取旋转角度---弧度
    CGFloat r = rotation.rotation;
   
    //弧度转角度
    //180/Pi = x/r
    NSLog(@"r is %.2f",180 / M_PI* r);

}

//捏合
- (void)pinchAction:(UIPinchGestureRecognizer*)pinch
{
    //获得捏合的比例
    CGFloat scale = pinch.scale;
//    pinch.view.transform = CGAffineTransformScale(pinch.view.transform, scale, scale);
    pinch.view.transform= CGAffineTransformMakeScale(scale, scale);
   

}

ViewController.h文件：

#import<UIKit/UIKit.h>
#import "MyView.h"

@interfaceViewController : UIViewController<MyPotocol>

@property(weak,nonatomic)IBOutletMyView*myView;
@property(weak,nonatomic)IBOutletUILabel*label;

@end

ViewController.m文件：

#import"ViewController.h"

@interfaceViewController()

@end

@implementationViewController

- (void)viewDidLoad {
    [superviewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.myView.delegate= self;

   
}

//单击、双击
- (void)touchTap:(NSString*)str
{
    self.label.text= str;
}
- (void)distance:(CGFloat)dis
{
    if (dis < 0) {
        self.label.text= @"向左轻扫";
    }elseif(dis >0) {
        self.label.text= @"向右轻扫";

    }
}

//捏合
- (void)change:(CGFloat)distance
{
    if (distance > 0) {
        self.label.text= @"捏合放大";
    }elseif (distance < 0){
        self.label.text= @"捏合缩小";
       
    }else{
        self.label.text= @"平移";
    }
}

@end

UI09-homework：使用touch的几种方法在label上打印出一只手单击，一只手双击，两只手单击，两只手双击，向左轻扫，向右轻扫

MyView.h文件：

#import<UIKit/UIKit.h>

@protocolMyPotocol <NSObject>

//单击、双击
- (void)touchTap:(NSString*)str;
//捏合
- (void)change:(CGFloat)distance;
//轻扫

- (void)distance:(CGFloat)dis;

@end

@interfaceMyView : UIView

@property(nonatomic,assign)id<MyPotocol> delegate;

@end

MyView.m文件：

#import"MyView.h"

@implementationMyView
- (void)awakeFromNib
{
    [superawakeFromNib];

    self.multipleTouchEnabled= YES;

}

//单击、双击
- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
    //拿到手指的个数
    NSInteger fingures = touches.count;
    //拿到某一对象
    UITouch *touch = touches.anyObject;
    //对象的点击次数
    NSInteger count = touch.tapCount;

    [selftapTouch:fingurestapCount:count];

}
//单击、双击方法
- (void)tapTouch:(NSInteger)touches tapCount:(NSInteger)count
{
    if (touches < 2) {
        if (count < 2) {
            [selfperformSelector:@selector(singleTap1)withObject:nilafterDelay:0.5];
           
        }else{
            [NSObjectcancelPreviousPerformRequestsWithTarget:selfselector:@selector(singleTap1)object:nil];
            [selfdoubleTap1];
        }
    }elseif (touches ==2){
        if (count < 2) {
            [selfperformSelector:@selector(singleTap2)withObject:nilafterDelay:0.5];
        }
        else{
            [NSObjectcancelPreviousPerformRequestsWithTarget:selfselector:@selector(singleTap2)object:nil];
            [selfdoubleTap2];
        }
    }
}

- (void)singleTap1
{
    NSString *str = @"一只手单击";
    if ([self.delegaterespondsToSelector:@selector(touchTap:)]) {
        [self.delegatetouchTap:str];
    }
}
- (void)doubleTap1
{
    NSString *str = @"一只手双击";
    if ([self.delegaterespondsToSelector:@selector(touchTap:)]) {
        [self.delegatetouchTap:str];
    }
}
- (void)singleTap2
{
    NSString *str = @"两只手单击";
    if ([self.delegaterespondsToSelector:@selector(touchTap:)]) {
        [self.delegatetouchTap:str];
    }
   
}
- (void)doubleTap2
{
    NSString *str = @"两只手双击";
    if ([self.delegaterespondsToSelector:@selector(touchTap:)]) {
        [self.delegatetouchTap:str];
    }
}

//捏合放大,捏合缩小，向左向右清扫
- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
    //拿到手指的个数
    NSInteger fingures = touches.count;
    if (fingures == 1) {
        //拿到某一对象
        UITouch *touch = touches.anyObject;
        CGPoint nowPoint = [touchlocationInView:self];
        CGPoint prePoint = [touchpreviousLocationInView:self];
        CGFloat distance = nowPoint.x- prePoint.x;
        if ([self.delegaterespondsToSelector:@selector(distance:)]) {
            [self.delegatedistance:distance];
        }
    }elseif (fingures == 2) {
       
        NSArray *allObjects = touches.allObjects;
       

        UITouch *touch1 = allObjects[0];
        UITouch *touch2 = allObjects[1];
       
        CGPoint nowPoint1 = [touch1locationInView:self];
        CGPoint prePoint1 = [touch1previousLocationInView:self];
       
        CGPoint nowPoint2 = [touch2locationInView:self];
        CGPoint prePoint2 = [touch2previousLocationInView:self];
       
        //计算两点间的距离
        CGFloat nowDistance = [selfdistanceWithFirstPosition:nowPoint1SecondPoint:nowPoint2];
        CGFloat PreDistence = [selfdistanceWithFirstPosition:prePoint1SecondPoint:prePoint2];
       
        CGFloat sub = nowDistance - PreDistence;
       
        if ([self.delegaterespondsToSelector:@selector(change:)]) {

            [self.delegatechange:sub];

        }

    }

}

//计算两点间的距离
- (CGFloat)distanceWithFirstPosition:(CGPoint) firstP SecondPoint:(CGPoint) secondP
{
    CGFloat distance = powf(firstP.x- secondP.x,2) +powf(firstP.y- secondP.y,2);
    return sqrtf(distance);

}

@end