我的代码有问题，我需要处理屏幕上的平移或捏合。
但有时当我的两根手指在屏幕上时，手柄Panl 方法会调用。
我做错了什么？
-(void)addGestureRecognizer
{
// handle Pinch
imageViewForCrop.userInteractionEnabled = YES;
UIPinchGestureRecognizer *PinchOnScreen = [[UIPinchGestureRecognizer alloc]
initWithTarget:self action:@selector(handlePinch:)];
[imageViewForCrop addGestureRecognizer:PinchOnScreen];
// handle Pan
UIPanGestureRecognizer *panOnScreen = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
[imageViewForCrop addGestureRecognizer:panOnScreen];
}
这是平移方法：
-(void)handlePan:(UIPanGestureRecognizer *)recognizer
{
switch (recognizer.state)
{
case UIGestureRecognizerStateChanged:
{
NSLog(@"%lu",(unsigned long)recognizer.numberOfTouches);
CGPoint translation = [recognizer translationInView:imageViewForCrop];
if (image.size.width > image.size.height) // weight image
{
// after user pinch in the screen
if (imageViewForCrop.frame.size.height > self.view.frame.size.height - bottomImageCropView.frame.size.height)
{
// allow dragging only in Y coordinates by only updating the Y coordenates with translation position
recognizer.view.center = CGPointMake(recognizer.view.center.x, recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:imageViewForCrop];
// get the top edge coordinate for the top left corner of crop frame
float topEdgeImagePosition = CGRectGetMinY(imageViewForCrop.frame);
float topEdgeCropEreaPosition = CGRectGetMinY(cropErea.frame);
//get the buttom edge coordinate for bottom left corner of crop frame
float bottomEdgeImagePosition = CGRectGetMaxY(imageViewForCrop.frame);
float bottomEdgeCropEreaPosition = CGRectGetMaxY(cropErea.frame);
//
// if the top edge coordinate is less than or equal to Crop Erea frame
if (topEdgeImagePosition > topEdgeCropEreaPosition)
{
// draw drag view in max top position
imageViewForCrop.frame = CGRectMake(imageViewForCrop.frame.origin.x,topEdgeCropEreaPosition,imageViewForCrop.frame.size.width,imageViewForCrop.frame.size.height);
}
// if bottom edge coordinate is greater than or equal to 480
if (bottomEdgeImagePosition < bottomEdgeCropEreaPosition)
{
float ratio = (imageViewForCrop.frame.size.height - cropErea.frame.size.height) * -1;
// draw drag view in max bottom position
imageViewForCrop.frame = CGRectMake(imageViewForCrop.frame.origin.x,ratio,imageViewForCrop.frame.size.width,imageViewForCrop.frame.size.height);
}
}
// allow dragging only in X coordinates by only updating the X coordenates with translation position
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:imageViewForCrop];
// get the top edge coordinate for the top left corner of crop frame
float leftEdgeImagePosition = CGRectGetMinX(imageViewForCrop.frame);
float leftEdgeCropEreaPosition = CGRectGetMinX(cropErea.frame);
//get the buttom edge coordinate for bottom left corner of crop frame
float rightEdgeImagePosition = CGRectGetMaxX(imageViewForCrop.frame);
float rightEdgeCropEreaPosition = CGRectGetMaxX(cropErea.frame);
//
// if the top edge coordinate is less than or equal to Crop Erea frame
if (leftEdgeImagePosition > leftEdgeCropEreaPosition)
{
// draw drag view in max top position
imageViewForCrop.frame = CGRectMake(leftEdgeCropEreaPosition,0,imageViewForCrop.frame.size.width,imageViewForCrop.frame.size.height);
}
// if bottom edge coordinate is greater than or equal to 480
if (rightEdgeImagePosition < rightEdgeCropEreaPosition)
{
float ratio = (imageViewForCrop.frame.size.width - cropErea.frame.size.width) * -1;
// draw drag view in max bottom position
imageViewForCrop.frame = CGRectMake(ratio,0,imageViewForCrop.frame.size.width,imageViewForCrop.frame.size.height);
}
}
else if (image.size.width < image.size.height) // Height image
{
// after user pinch in the screen
if (imageViewForCrop.frame.size.width > self.view.frame.size.width)
{
// allow dragging only in X coordinates by only updating the X coordenates with translation position
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:imageViewForCrop];
// get the top edge coordinate for the top left corner of crop frame
float leftEdgeImagePosition = CGRectGetMinX(imageViewForCrop.frame);
float leftEdgeCropEreaPosition = CGRectGetMinX(cropErea.frame);
//get the buttom edge coordinate for bottom left corner of crop frame
float rightEdgeImagePosition = CGRectGetMaxX(imageViewForCrop.frame);
float rightEdgeCropEreaPosition = CGRectGetMaxX(cropErea.frame);
//
// if the top edge coordinate is less than or equal to Crop Erea frame
if (leftEdgeImagePosition > leftEdgeCropEreaPosition)
{
// draw drag view in max top position
imageViewForCrop.frame = CGRectMake(leftEdgeCropEreaPosition,imageViewForCrop.frame.origin.y,imageViewForCrop.frame.size.width,imageViewForCrop.frame.size.height);
}
// if bottom edge coordinate is greater than or equal to 480
if (rightEdgeImagePosition < rightEdgeCropEreaPosition)
{
float ratio = (imageViewForCrop.frame.size.width - cropErea.frame.size.width) * -1;
// draw drag view in max bottom position
imageViewForCrop.frame = CGRectMake(ratio,imageViewForCrop.frame.origin.y,imageViewForCrop.frame.size.width,imageViewForCrop.frame.size.height);
}
}
// allow dragging only in Y coordinates by only updating the Y coordenates with translation position
recognizer.view.center = CGPointMake(recognizer.view.center.x, recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:imageViewForCrop];
// get the top edge coordinate for the top left corner of crop frame
float topEdgeImagePosition = CGRectGetMinY(imageViewForCrop.frame);
float topEdgeCropEreaPosition = CGRectGetMinY(cropErea.frame);
//get the buttom edge coordinate for bottom left corner of crop frame
float bottomEdgeImagePosition = CGRectGetMaxY(imageViewForCrop.frame);
float bottomEdgeCropEreaPosition = CGRectGetMaxY(cropErea.frame);
//
// if the top edge coordinate is less than or equal to Crop Erea frame
if (topEdgeImagePosition > topEdgeCropEreaPosition)
{
// draw drag view in max top position
imageViewForCrop.frame = CGRectMake(0,topEdgeCropEreaPosition,imageViewForCrop.frame.size.width,imageViewForCrop.frame.size.height);
}
// if bottom edge coordinate is greater than or equal to 480
if (bottomEdgeImagePosition < bottomEdgeCropEreaPosition)
{
float ratio = (imageViewForCrop.frame.size.height - cropErea.frame.size.height) * -1;
// draw drag view in max bottom position
imageViewForCrop.frame = CGRectMake(0,ratio,imageViewForCrop.frame.size.width,imageViewForCrop.frame.size.height);
}
}
else
{
imageViewForCrop.frame = CGRectMake(cropErea.frame.origin.x, cropErea.frame.origin.y, 320, 320);
}
}
default:
break;
}
}
这是捏法：
- (void)handlePinch:(UIPinchGestureRecognizer *)pinchGestureRecognizer
{
NSLog(@" X %i " ,(int)imageViewForCrop.frame.origin.x );
if ((int)imageViewForCrop.frame.origin.x > 0 )
{
[UIView animateWithDuration:0.4 animations:^
{
[imageViewForCrop setFrame:CGRectMake( 0 , imageViewForCrop.frame.origin.y , imageViewForCrop.frame.size.width , imageViewForCrop.frame.size.height )];
}];
}
NSLog(@" Y %i " , (int)imageViewForCrop.frame.origin.y );
if ((int)imageViewForCrop.frame.origin.y > 0)
{
[UIView animateWithDuration:0.4 animations:^
{
[imageViewForCrop setFrame:CGRectMake( imageViewForCrop.frame.origin.x , 0 , imageViewForCrop.frame.size.width , imageViewForCrop.frame.size.height )];
}];
}
NSLog(@" Width %i and %i " , (int)imageViewForCrop.frame.size.width , (int)originalSizeForIphoneWidth );
if ((int)imageViewForCrop.frame.size.width < (int)originalSizeForIphoneWidth)
{
[UIView animateWithDuration:0.4 animations:^
{
[imageViewForCrop setFrame:CGRectMake( imageViewForCrop.frame.origin.x , imageViewForCrop.frame.origin.y , originalSizeForIphoneWidth+1, imageViewForCrop.frame.size.height)];
}];
}
NSLog(@"Hight %i and %i " , (int)imageViewForCrop.frame.size.height , (int)originalSizeForIphoneHight );
if ((int)imageViewForCrop.frame.size.height < (int)originalSizeForIphoneHight)
{
[UIView animateWithDuration:0.4 animations:^
{
[imageViewForCrop setFrame:CGRectMake(imageViewForCrop.frame.origin.x , imageViewForCrop.frame.origin.y , imageViewForCrop.frame.size.width, originalSizeForIphoneHight+1)];
}];
//return;
}
CGFloat factor = [(UIPinchGestureRecognizer *) pinchGestureRecognizer scale];
if(factor >1)
{
// for the first time bug when pinch in or out
if (lastScaleFactor == 0 )
{
lastScaleFactor = 1;
}
imageViewForCrop.transform =CGAffineTransformMakeScale(lastScaleFactor +(factor-1), lastScaleFactor +(factor-1));
}
else // pinch in
{
imageViewForCrop.transform=CGAffineTransformMakeScale(lastScaleFactor * factor, lastScaleFactor*factor);
}
if (pinchGestureRecognizer.state == UIGestureRecognizerStateEnded)
{
if (factor>1) {
lastScaleFactor +=(factor-1);
}
else {
lastScaleFactor*= factor;
}
}
}
我用limitmaxOfTouches解决了这个问题：
// handle Pan
UIPanGestureRecognizer *panOnScreen = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
panOnScreen.maximumNumberOfTouches = 1;
[imageViewForCrop addGestureRecognizer:panOnScreen];
我希望这对某人有所帮助（-： .