UITouch

ViewController-UITouch

//触摸开始
- (void)touchesBegan:(NSSet )touches withEvent:(UIEvent )event
{
//获取坐标信息
//获取到触摸点
UITouch *touch = [touches anyObject];

//转化为当前视图的具体坐标
CGPoint point = [touch locationInView:self.view];

NSLog(@"point == %@",NSStringFromCGPoint(point));

}

//触摸移动
- (void)touchesMoved:(NSSet )touches withEvent:(UIEvent )event
{
//获取坐标信息
//获取到触摸点
UITouch *touch = [touches anyObject];

//转化为当前视图的具体坐标
CGPoint point = [touch locationInView:self.view];

NSLog(@"point == %@",NSStringFromCGPoint(point));

}

//触摸结束
- (void)touchesEnded:(NSSet )touches withEvent:(UIEvent )event
{
//获取坐标信息
//获取到触摸点
UITouch *touch = [touches anyObject];

//转化为当前视图的具体坐标
CGPoint point = [touch locationInView:self.view];

NSLog(@"point == %@",NSStringFromCGPoint(point));

}

//触摸取消
- (void)touchesCancelled:(NSSet )touches withEvent:(UIEvent )event
{
//获取坐标信息
//获取到触摸点
UITouch *touch = [touches anyObject];

//转化为当前视图的具体坐标
CGPoint point = [touch locationInView:self.view];

NSLog(@"point == %@",NSStringFromCGPoint(point));

}

左右滑动切换图片练习

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  _imgView = [[UIImageView alloc] initWithFrame:self.view.bounds];
  _imgView.image = [UIImage imageNamed:@”1.jpg”];
  [self.view addSubview:_imgView];

  _count = 1;
  }

• (void)touchesBegan:(NSSet )touches withEvent:(UIEvent )event
  {
  UITouch *touch = [touches anyObject];
  _beiginPoint = [touch locationInView:self.view];
  }

• (void)touchesEnded:(NSSet )touches withEvent:(UIEvent )event
  {
  UITouch *touch = [touches anyObject];
  _endPoint = [touch locationInView:self.view];

  [self compare];
  }

• (void)compare
  {
  //右滑
  if (_beiginPoint.x - _endPoint.x > 0) {
  _count ++;
  if (_count == 5) {
  _count = 1;
  }
  _imgView.image = [UIImage imageNamed:[NSString stringWithFormat:@”%ld.jpg”,_count]];
  }

  //左滑
  else if(_beiginPoint.x - _endPoint.x < 0)
  {
  _count –;
  if (_count == 0) {
  _count = 4;
  }
  _imgView.image = [UIImage imageNamed:[NSString stringWithFormat:@”%ld.jpg”,_count]];
  }

}