#Objective - C - UI-design - 第四天 -UIKit框架-UIKit-事件手势-刮刮乐小游戏

响应者

• iOS中所有能响应事件(触摸、晃动、远程事件)的对象都是响应者。
• 系统定义了一个抽象的父类UIResponder来表示响应者。 其子类都是响应者。

阻断响应者链

• 响应者链可以被打断。无法完成检测查询过程。
• 视图类的属性 : userInteractionEnabled ,关闭后能阻断查询过程。

    //UIView和Label用户交互默认为NO    //页面多控件尤其复合时,容易使touch被阻断覆盖,将其调整为YES以解决问题    //用户交互,可开启或阻断事件    //tv.userInteractionEnabled = NO;    //UILabel

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各种手势

{//全局变量    int i ;    UIImageView *imageView;    UIImageView *image;}//手势初始化设置#pragma mark- 准备    image = [[UIImageView alloc]initWithFrame:self.view.bounds];    image.image = [UIImage imageNamed:@"1.jpg"];    imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 300, 150, 150)];//初始化    [imageView setBackgroundColor:[UIColor redColor]];    imageView.alpha = .5;    //层级圆角    imageView.layer.masksToBounds = YES;    imageView.layer.borderWidth = 5.;    imageView.layer.borderColor = [[UIColor blackColor]CGColor];    imageView.layer.cornerRadius = 15.;#pragma mark- 必须打开交互开关    [imageView setUserInteractionEnabled:YES];    [self.view addSubview:image];    [self.view addSubview:imageView];#pragma mark- 轻击,点击(tap)    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapse:)];//创建手势识别对象    tap.numberOfTapsRequired = 1; //点击次数    tap.numberOfTouchesRequired = 1; //点击屏幕的手指数    [imageView addGestureRecognizer:tap];    //屏幕换背景    UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapse1:)];    [self.view addGestureRecognizer:tap1];#pragma mark- 捏合,收缩(pinch)    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinse:)];    [imageView addGestureRecognizer:pinch];#pragma mark- 旋转(rotate)    UIRotationGestureRecognizer *rotate = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rose:)];    [imageView addGestureRecognizer:rotate];#pragma mark- 拖动(pan)    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panse:)];    //手指数最大最小值    [pan setMinimumNumberOfTouches:1];    [pan setMaximumNumberOfTouches:1];    [imageView addGestureRecognizer:pan];#pragma mark- 长按(longpress)    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longse:)];    //次数    longPress.numberOfTapsRequired = 1;    //手指    longPress.numberOfTouchesRequired = 1;    //长按最小时间    [longPress setMinimumPressDuration:.2f];    [imageView addGestureRecognizer:longPress];#pragma mark- 轻扫(swipe)    UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipese:)];    //指定划的方向    [swipeUp setDirection:UISwipeGestureRecognizerDirectionUp];    //2    UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipese:)];    [swipeDown setDirection:UISwipeGestureRecognizerDirectionDown];    //3    UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipese:)];    swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;    //4    UISwipeGestureRecognizer *swiperRight = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipese:)];    swiperRight.direction = UISwipeGestureRecognizerDirectionRight;    //放入屏幕    [self.view addGestureRecognizer:swiperRight];    [self.view addGestureRecognizer:swipeUp];    [self.view addGestureRecognizer:swipeLeft];    [self.view addGestureRecognizer:swipeDown];#pragma mark- 摇动(shake)    //摇动手势操作方法，点击硬件设备上Hardware的Shake Gesture按钮即可//手势触发时方法#pragma mark- 轻击后实现方法-(void)tapse:(UITapGestureRecognizer *)tap{    if (imageView.backgroundColor == [UIColor redColor]) {        [imageView setBackgroundColor:[UIColor cyanColor]];    }else{        imageView.backgroundColor = [UIColor redColor];    }}-(void)tapse1:(UITapGestureRecognizer *)tap{    if (i > 5) {        i = 1;    }    NSString *string = [NSString stringWithFormat:@"%d.jpg",i++];    [image setImage:[UIImage imageNamed:string]];}#pragma mark- 捏合实现方法-(void)pinse:(UIPinchGestureRecognizer *)pin{    if (pin.state == UIGestureRecognizerStateChanged) {//状态改变        //使用仿射变换来放大缩小        CGAffineTransform trans = imageView.transform;        trans = CGAffineTransformScale(trans, pin.scale, pin.scale);        imageView.transform = trans;    }    pin.scale = 1.0;//复位}#pragma mark- 旋转(rotate)实现-(void)rose:(UIRotationGestureRecognizer *)rot{    if (rot.state == UIGestureRecognizerStateChanged) {        imageView.transform = CGAffineTransformMakeRotation(rot.rotation);    }}#pragma mark- 拖动实现-(void)panse:(UIPanGestureRecognizer*)pan{    if (pan.state == UIGestureRecognizerStateChanged) {        CGPoint point = [pan translationInView:self.view];//pan相对于屏幕的坐标(移动距离)        CGPoint center = imageView.center;//要移动物件的中心坐标        imageView.center = CGPointMake(point.x + center.x, point.y + center.y);    }    [pan setTranslation:CGPointZero inView:self.view];//复位}#pragma mark- 长按实现-(void)longse:(UILongPressGestureRecognizer *)lp{    if (lp.state == UIGestureRecognizerStateChanged) {//长按时间到变黄        imageView.backgroundColor = [UIColor yellowColor];    }    else if(lp.state == UIGestureRecognizerStateEnded){//松开鼠标变回红色        imageView.backgroundColor = [UIColor redColor];    }}#pragma mark- 轻扫实现-(void)swipese:(UISwipeGestureRecognizer *)swipe{    if (swipe.direction == UISwipeGestureRecognizerDirectionUp) {        imageView.backgroundColor = [UIColor yellowColor];    }else if (swipe.direction == UISwipeGestureRecognizerDirectionDown){        imageView.backgroundColor = [UIColor cyanColor];    }else if (swipe.direction == UISwipeGestureRecognizerDirectionLeft){        imageView.backgroundColor = [UIColor grayColor];    }else if (swipe.direction == UISwipeGestureRecognizerDirectionRight){        imageView.backgroundColor = [UIColor brownColor];        NSLog(@"草那么麻烦");    }}#pragma mark- 摇动(shake)-(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{    //重写    if (event.subtype == UIEventSubtypeMotionShake) {        imageView.image = [UIImage imageNamed:@"5"];        NSLog(@"草泥马");    }}

刮刮乐小游戏

{        UIImageView *girl;//底图        UIImageView *clear;//遮罩图}    //底图    girl = [[UIImageView alloc]initWithFrame:self.view.bounds];    [girl setImage:[UIImage imageNamed:@"001.jpg"]];    [self.view addSubview:girl];    //遮罩图    clear = [[UIImageView alloc]initWithFrame:girl.bounds];    [clear setImage:[UIImage imageNamed:@"002.jpg"]];    [self.view addSubview:clear];

//消除实现方法//手势移动时触发-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    //图片覆盖清除事件    UITouch *touch = [touches anyObject];    CGPoint point = [touch locationInView:clear];    UIGraphicsBeginImageContext(clear.frame.size);    [clear.image drawInRect:clear.bounds];    CGContextClearRect(UIGraphicsGetCurrentContext(), CGRectMake(point.x, point.y, 50, 50));    clear.image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();}