UIPanGestureRecognizer使用小结(3)

p>        NSLog(@"pan gesture testPanView begin  is %@,%@", NSStringFromCGPoint([recognizer view].center), NSStringFromCGRect([recognizer view].frame));

p>    }

p> 

p>    if ([(UIPanGestureRecognizer *)recognizer state] == UIGestureRecognizerStateChanged) {

p>        CGFloat x = firstX + translatedPoint.x;

p>        CGFloat y = firstX + translatedPoint.y;

p> 

p>        if (x < recognizer.view.width / 2.0) {

p>            x = recognizer.view.width / 2.0;

p>        } else if (x + recognizer.view.width / 2.0 > self.view.width) {

p>            x = self.view.width - recognizer.view.width / 2.0;

p>        }

p> 

p>        if (y < recognizer.view.height / 2.0) {

p>            y = recognizer.view.height / 2.0;

p>        } else if (y + recognizer.view.height / 2.0 > self.view.height) {

p>            y = self.view.height - recognizer.view.height / 2.0;

p>        }

p> 

p>        NSLog(@"gesture translatedPoint moving  is %@", NSStringFromCGPoint(translatedPoint));

p> 

p>        recognizer.view.center = CGPointMake(x, y);

p>    }

p> 

p>    if (([(UIPanGestureRecognizer *)recognizer state] == UIGestureRecognizerStateEnded) || ([(UIPanGestureRecognizer *)recognizer state] == UIGestureRecognizerStateCancelled)) {

p>        CGFloat x = recognizer.view.center.x;

p>        CGFloat y = recognizer.view.center.y;

p> 

p>        if (x > firstX) {

p>            x = self.view.width - recognizer.view.width / 2.0;

p>        } else {

p>            x = recognizer.view.width / 2.0;

p>        }

p> 

p>        if (y > firstY) {

p>            y = self.view.height - recognizer.view.height / 2.0;

p>        } else {

p>            y = recognizer.view.height / 2.0;

p>        }

p> 

p>        CGFloat velocityX = (0.2 *[recognizer velocityInView:self.view].x);

p> 

p>        [UIView beginAnimations:nil context:NULL];

p> 

p>        [UIView setAnimationDuration:ABS(velocityX * 0.00002 + 0.2)];

p> 

p>        [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];

p> 

p>        recognizer.view.center = CGPointMake(x, y);