IOS 学习札记（15）监听手势动作

IOS 学习笔记（15）监听手势动作

监听并捕获到长久按住屏幕的手势动作

创建一个UILongPressGestureRecognizer的实例对象，并把这个对象绑定在你的视图控制器里面。

numberOfTapsRequired  这个属性保存了用户的点击次数，当这个手势动作触发之前，并没有一个手势是在屏幕上的，当第一次把手指点击在屏幕上，然后拿开，这个动作可以称为一次点击事件。

numberOfTouchesRequired 这个属性保存了多少个手指点击了屏幕，因此你要确保你每次的点击手指数目是一样的，默认值为0；

minimumPressDuration 这个参数表示两次点击之间的时间长度。

allowableMovement:100 连续点击100次

@property(nonatomic,strong)UILongPressGestureRecognizer *longPressGestureRecognizer;

@property(nonatomic,strong)UIButton *dummyButton;

@synthesize longPressGestureRecognizer,dummyButton;

- (void)viewDidLoad

{

    [superviewDidLoad];

self.view.backgroundColor = [UIColorwhiteColor];

    dummyButton = [UIButtonbuttonWithType:UIButtonTypeRoundedRect];

    dummyButton.frame =CGRectMake(0.0f,0.0f, 72.0f,37.0f);

    dummyButton.center =self.view.center;

    [self.viewaddSubview:dummyButton];

    

   longPressGestureRecognizer = [[UILongPressGestureRecognizeralloc]initWithTarget:selfaction:@selector(handleLongPressGestures:)];

    longPressGestureRecognizer.numberOfTouchesRequired =2;

    longPressGestureRecognizer.allowableMovement =100.0f;

    longPressGestureRecognizer.minimumPressDuration =1.0;

    [self.viewaddGestureRecognizer:longPressGestureRecognizer];

}

-(void)handleLongPressGestures:(UILongPressGestureRecognizer *)paramSender{

    if([paramSenderisEqual:longPressGestureRecognizer]){

       if(paramSender.numberOfTouchesRequired ==2){

           CGPoint touchPoint1 = [paramSender locationOfTouch:0 inView:paramSender.view];

           CGPoint touchPoint2 = [paramSender locationOfTouch:1 inView:paramSender.view];

           CGFloat midPointX = (touchPoint1.x + touchPoint2.x)/2.0f;

           CGFloat midPointY = (touchPoint1.y + touchPoint2.y)/2.0f;

           CGPoint midPoint = CGPointMake(midPointX, midPointY);

           dummyButton.center = midPoint;

        }else{

           NSLog(@"111");

        }

    }

}

监听捕获轻击的手势动作

创建一个UITapGestureRecognizer类的实例对象看，然后把他们绑定到我们的视图上。

@property(nonatomic,strong)UITapGestureRecognizer *tapGestureRecognizer;

tapGestureRecognizer = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(handleTaps:)];

    tapGestureRecognizer.numberOfTouchesRequired =2;

    tapGestureRecognizer.numberOfTapsRequired =3;

    [self.viewaddGestureRecognizer:tapGestureRecognizer];

-(void)handleTaps:(UITapGestureRecognizer *)paramSender{

   NSUInteger touchCounter = 0;

   for(touchCounter = 0;touchCounter < paramSender.numberOfTouchesRequired; touchCounter++){

       CGPoint touchPoint = [paramSender locationOfTouch:touchCounter inView:paramSender.view];

       NSLog(@"Touch #%lu:%@",(unsignedlong)touchCounter+1,NSStringFromCGPoint(touchPoint));

    }

}

NSStringFromCGPoint 把一个物理 的位置信息转换成一个NSString类型的数据。

放大和缩小的手势监听和处理

创建一个UIPinchGestureRecognizer类的实例化对象，然后把这个对象添加到你的视图中去。

@property(nonatomic,strong)UIPinchGestureRecognizer *pinchGestureRecognizer;

@property(nonatomic,strong)UILabel *myBlackLabel;

@property(nonatomic,unsafe_unretained)CGFloat currentScale;

@synthesize pinchGestureRecognizer,myBlackLabel,currentScale;

CGRect labelRect =CGRectMake(0.0f,0.0f, 200.0f,200.0f);

   myBlackLabel = [[UILabelalloc]initWithFrame:labelRect];

    myBlackLabel.center =self.view.center;

    myBlackLabel.backgroundColor = [UIColorblackColor];

    myBlackLabel.userInteractionEnabled =YES;

    [self.viewaddSubview:myBlackLabel];

    

   pinchGestureRecognizer = [[UIPinchGestureRecognizeralloc]initWithTarget:selfaction:@selector(handlePinches:)];

    [myBlackLabel addGestureRecognizer:pinchGestureRecognizer];

-(void)handlePinches:(UIPinchGestureRecognizer *)paramSender{

    if (paramSender.state ==UIGestureRecognizerStateEnded) {

       self.currentScale = paramSender.scale;

    }elseif(paramSender.state ==UIGestureRecognizerStateBegan && self.currentScale != 0.0f){

        paramSender.scale =self.currentScale;

    }

   if(paramSender.scale !=NAN && paramSender.scale !=0.0){

        paramSender.view.transform =CGAffineTransformMakeScale(paramSender.scale, paramSender.scale);

    }

}