IOS development of touch events detailed introduction

- (void)touchesBegan:(NSSet )touches withEvent:(UIEvent )event; 
- (void)touchesMoved:(NSSet )touches withEvent:(UIEvent )event; 
- (void)touchesEnded:(NSSet )touches withEvent:(UIEvent )event; 
- (void)touchesCancelled:(NSSet )touches withEvent:(UIEvent )event;

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

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

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

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

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

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

The window in which the touch is generated
@property(nonatomic,readonly,retain) UIWindow *window;
The view in which the touch is generated
@property(nonatomic,readonly,retain) UIView  *view;
Number of times the screen is tapped in a short time，Can be based ontapCountJudgment click、Double-click or more clicks
@property(nonatomic,readonly) NSUInteger tapCount;
Records the time when the touch event occurs or changes，Unit is seconds
@property(nonatomic,readonly) NSTimeInterval  timestamp;
The current state of the touch event
@property(nonatomic,readonly) UITouchPhase phase;

- (CGPoint)locationInView:(UIView *)view;
The return value indicates that the touch isviewLocation on
The returned location here is forviewof coordinate system（byviewThe upper left corner is the origin(0, 0)）
Passed in during callviewThe parameters arenilWord，The touch point is returnedUIWindowLocation
- (CGPoint)previousLocationInView:(UIView *)view;
该方法记录了前一个触摸点Location

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{

 //Get UITouch object UITouch *touch = [touches anyObject];
 //Get the previous point CGPoint p = [touch previousLocationInView:self];
 //Get the current point CGPoint currp = [touch locationInView:self];
 //Produce translation and drag effect  = CGAffineTransformTranslate(,  - ,  - );

}

private int x, y;
@Override
 public boolean onTouchEvent(MotionEvent event) {
  switch (()){
   case MotionEvent.ACTION_DOWN:
    x = (int) ();
    y = (int) ();
    break;
   case MotionEvent.ACTION_MOVE:
    int mx = (int)();
    int my = (int)();

//    setTranslationX(getTranslationX()+mx-x);
//    setTranslationY(getTranslationY()+my-y);

    layout(getLeft()+mx-x,getTop()+my-y,getLeft()+getMeasuredWidth()+mx-x,getTop()+getMeasuredHeight()+my-y);

    x = mx;
    y = my;
    break;
  }
  return true;
 }

UIGestureRecognizer

UIGestureRecognizerIt's an abstract class，Defines the basic behavior of all gestures，Use its subclass to handle specific gestures
UITapGestureRecognizer(tap)
UIPinchGestureRecognizer(Pinch，For zoom)
UIPanGestureRecognizer(Drag and drag)
UISwipeGestureRecognizer(Swipe lightly)
UIRotationGestureRecognizer(Rotate)
UILongPressGestureRecognizer(Long press)

//Create a gesture recognizer objectUITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init];
//Set specific properties of gesture recognizer object// Tap twice in a row = 2;
// 2 fingers are required to tap together = 2;
//Add gesture recognizer to the corresponding view[ addGestureRecognizer:tap];
Triggering of monitor gestures
[tap addTarget:self action:@selector(tapIconView:)];

//Called when the page is loaded- (void)viewDidLoad {
 [super viewDidLoad];
 //Create a gesture recognizer object  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
 //Add gesture recognizer to the corresponding view [ addGestureRecognizer:pan];
}

- (void)pan:(UIPanGestureRecognizer *)pan
{
 // Get the touch point of gesture // CGPoint curP = [pan locationInView:];

 // Get the movement of the gesture, which is also relative to the initial position CGPoint transP = [pan translationInView:];

  = CGAffineTransformTranslate(, , );

 // Reset [pan setTranslation:CGPointZero inView:];
 //Judge the current finger status //if ( == UIGestureRecognizerStateBegan) {// When pressing the finger, it is similar to ACTION_DOWN in Android //}
}

// No touch event occurs, the default state of all gesture recognition UIGestureRecognizerStatePossible,
 // When a gesture has begun but has not changed or has been completed UIGestureRecognizerStateBegan,
 // Change of gesture status UIGestureRecognizerStateChanged,
 // gesture completed UIGestureRecognizerStateEnded,
 // The gesture is cancelled and restored to Possible state UIGestureRecognizerStateCancelled, 
 // The gesture fails and returns to Possible state UIGestureRecognizerStateFailed,
 // Identify gesture recognition UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded 

#pragma mark - Gesture Proxy Method// Whether to enable triggering gestures//- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
//{
// return NO;
//}

// Whether to support multiple gestures at the same time, the default is that multiple gestures are not supported// Return to yes to support multiple gestures- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
 return YES;
}

// Whether to accept finger touch points//- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
// // Get the current touch point// CGPoint curP = [touch locationInView:];
//  return YES;
//}

// Called when event is passed// When the event is passed to the control, this method of the control will be called to find the most suitable view// point: the current touch point, the coordinate system of point point is the method caller- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
 // The method of calling the system is to find the most suitable view and return the most suitable view UIView *fitView = [super hitTest:point withEvent:event];

// NSLog(@"fitView--%@",fitView);
 return fitView;
}

// Function: determine whether the current point is on the method caller (control)- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
 return YES;
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{

 // 1. Determine whether the current control can receive events if ( == NO ||  == YES ||  <= 0.01) return nil;

 // 2. Whether the point is in the current control if ([self pointInside:point withEvent:event] == NO) return nil;

 // 3. traverse your own child control from behind to front NSInteger count = ;

 for (NSInteger i = count - 1; i >= 0; i--) {
  UIView *childView = [i];

  // Convert the coordinate system on the current control to the coordinate system on the subcontrol  CGPoint childP = [self convertPoint:point toView:childView];

  UIView *fitView = [childView hitTest:childP withEvent:event];


  if (fitView) { // Find the most suitable view   return fitView;
  }
 }
 // The end of the loop means that there is no more suitable view than yourself return self;
}