IOS gestures UIGestureRecognizer

IOS gestures UIGestureRecognizer

      Contains the UIGestureRecognizer class in UIKit for gesture detection device.Contains the UIGestureRecognizer class in UIKit for gesture detection device. UIGestureRecognizer is an abstract class defines the basic behavior of all gestures, it has the following sub-class for handling the specific gestures:

A the slap UITapGestureRecognizer (any number of times the slap)

2, the inward or outward pinch UIPinchGestureRecognizer (for scaling)

3, shake or drag UIPanGestureRecognizerCollision UISwipeGestureRecognizer (in any direction)Rotation UIRotationGestureRecognizer (finger towards the opposite direction)

6, long press UILongPressGestureRecognizer For different types of gesture recognition, with a different configuration properties. UITapGestureRecognizer, can be configured to slap the number. Interface receiver to the gestures can send a message for the task in response to gestures. Of course, different gesture recognition, messages sent method will be different. Here are a few specific examples of code:

UITapGestureRecognizer *oneFingerTwoTaps = 
 
  [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerTwoTaps)] autorelease]; 
 
// Set required taps and number of touches 
 
[oneFingerTwoTaps setNumberOfTapsRequired:2]; 
 
[oneFingerTwoTaps setNumberOfTouchesRequired:1]; 
 
// Add the gesture to the view 
 
[[self view] addGestureRecognizer:oneFingerTwoTaps]; 
 
oneFingerTwoTaps 
 
- (void)oneFingerTwoTaps 
 
{ 
 
  NSLog(@"Action: One finger, two taps"); 
 
} 

Two fingers, slap the two gestures

  UITapGestureRecognizer *twoFingersTwoTaps = 
 
      [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersTwoTaps)] autorelease]; 
 
    [twoFingersTwoTaps setNumberOfTapsRequired:2]; 
 
    [twoFingersTwoTaps setNumberOfTouchesRequired:2]; 
 
    [[self view] addGestureRecognizer:twoFingersTwoTaps]; 
 
twoFingersTwoTaps 
 
    - (void)twoFingersTwoTaps { 
 
      NSLog(@"Action: Two fingers, two taps"); 
 
    } 

A finger up, down gestures collision

  UISwipeGestureRecognizer *oneFingerSwipeUp = 
 
      [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeUp:)] autorelease]; 
 
    [oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp]; 
 
    [[self view] addGestureRecognizer:oneFingerSwipeUp]; 
 
      
 
    - (void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer 
 
    { 
 
      CGPoint point = [recognizer locationInView:[self view]]; 
 
      NSLog(@"Swipe up - start location: %f,%f", point.x, point.y); 
 
    } 

UISwipeGestureRecognizer *oneFingerSwipeDown = 
 
      [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeDown:)] autorelease]; 
 
    [oneFingerSwipeDown setDirection:UISwipeGestureRecognizerDirectionDown]; 
 
    [[self view] addGestureRecognizer:oneFingerSwipeDown]; 
 
      
 
    - (void)oneFingerSwipeDown:(UISwipeGestureRecognizer *)recognizer 
 
    { 
 
      CGPoint point = [recognizer locationInView:[self view]]; 
 
      NSLog(@"Swipe down - start location: %f,%f", point.x, point.y); 
 
    } 
 

Rotation gesture

UIRotationGestureRecognizer *twoFingersRotate = 
 
  [[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersRotate:)] autorelease]; 
 
[[self view] addGestureRecognizer:twoFingersRotate]; 
 
 
 
- (void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer 
 
{ 
 
  // Convert the radian value to show the degree of rotation 
 
  NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI)); 
 
} 

 Inward or outward pinching gestures

UIPinchGestureRecognizer *twoFingerPinch = 
 
  [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease]; 
 
[[self view] addGestureRecognizer:twoFingerPinch]; 
 
 
 
- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer 
 
{ 
 
  NSLog(@"Pinch scale: %f", recognizer.scale); 
 
}