-(void)btnPanGesture:(UIPanGestureRecognizer*)panGesture
{
 UIView *vw = panGesture.view;
 CGRect oldFrame = self.frame;
 CGRect oldIntersectRect = CGRectIntersection(self.frame, self.superview.bounds);

 CGPoint transport = [panGesture translationInView:vw];
 if (vw.tag == 4) {
  self.width = self.preFrame.size.width + transport.x;
  self.height = self.preFrame.size.height + transport.y;
 }
 else if(vw.tag == 3)
 {
  self.x = self.preFrame.origin.x + transport.x;
  self.width = self.preFrame.size.width - transport.x;
  self.height = self.preFrame.size.height + transport.y;
 }
 else if(vw.tag == 2)
 {
  self.width = self.preFrame.size.width + transport.x;
  self.y = self.preFrame.origin.y + transport.y;
  self.height = self.preFrame.size.height - transport.y;
 }
 else if(vw.tag == 1)
 {
  self.x = self.preFrame.origin.x + transport.x;
  self.width = self.preFrame.size.width - transport.x;
  self.y = self.preFrame.origin.y + transport.y;
  self.height = self.preFrame.size.height - transport.y;
 }
 if (panGesture.state == UIGestureRecognizerStateEnded) {
  self.preFrame = self.frame;
 }
 if (self.width < MinWidth || self.height < MinHeight) {
  self.frame = oldFrame;
 }
 CGRect newFrame = self.frame;
 if (newFrame.size.width * newFrame.size.height > oldFrame.size.height * oldFrame.size.width) {

  CGRect newIntersectRect = CGRectIntersection(self.frame, self.superview.bounds);
  if (newFrame.size.width * newFrame.size.height > newIntersectRect.size.width * newIntersectRect.size.height) {
   self.frame = oldFrame;
  }
 }
 self.preCenter = self.center;
}

-(void)viewPanGesture:(UIPanGestureRecognizer*)panGesture
{
 UIView *vw = panGesture.view;
 CGRect oldFrame = self.frame;
 CGRect oldIntersectRect = CGRectIntersection(self.frame, self.superview.bounds);

 CGPoint transport = [panGesture translationInView:vw];
 if (vw.tag == 1) {
  self.y = self.preFrame.origin.y + transport.y;
  self.height = self.preFrame.size.height - transport.y;
 }
 else if(vw.tag == 2)
 {
  self.x = self.preFrame.origin.x + transport.x;
  self.width = self.preFrame.size.width - transport.x;
 }
 else if(vw.tag == 3)
 {
  self.height = self.preFrame.size.height + transport.y;
 }
 else if(vw.tag == 4)
 {
  self.width = self.preFrame.size.width + transport.x;
 }
 if (panGesture.state == UIGestureRecognizerStateEnded) {
  self.preFrame = self.frame;
 }
 if (self.width < MinWidth || self.height < MinHeight) {
  self.frame = oldFrame;

 }
 self.preCenter = self.center;
 CGRect newFrame = self.frame;
 if (newFrame.size.width * newFrame.size.height > oldFrame.size.height * oldFrame.size.width) {

  CGRect newIntersectRect = CGRectIntersection(self.frame, self.superview.bounds);
  if (oldIntersectRect.size.width * oldIntersectRect.size.height >= newIntersectRect.size.width * newIntersectRect.size.height) {
   self.frame = oldFrame;
   self.preCenter = self.preCenter;
  }

 }

}

-(void)contentViewPanGestureAction:(UIPanGestureRecognizer*)panGesture
{
 CGPoint transport = [panGesture translationInView:self];
 CGRect oldFrame = self.frame;
 CGRect oldIntersectRect = CGRectIntersection(self.frame, self.superview.bounds);
 CGFloat oldMj = oldIntersectRect.size.width * oldIntersectRect.size.height;

 self.center = CGPointMake(self.preCenter.x + transport.x, self.preCenter.y + transport.y);

 if (panGesture.state == UIGestureRecognizerStateEnded) {

  self.preCenter = self.center;
 }
 CGRect newIntersectRect = CGRectIntersection(self.frame, self.superview.bounds);
 CGFloat newMj = newIntersectRect.size.width * newIntersectRect.size.height;

 if (newMj < oldMj) {
  self.frame = oldFrame;
  self.preCenter = self.center;
 }
}

-(void)cropImg
{
 CGRect cropFrame = self.cropView.frame;
 CGFloat orgX = cropFrame.origin.x * (self.img.size.width / self.imgView.frame.size.width);
 CGFloat orgY = cropFrame.origin.y * (self.img.size.height / self.imgView.frame.size.height);
 CGFloat width = cropFrame.size.width * (self.img.size.width / self.imgView.frame.size.width);
 CGFloat height = cropFrame.size.height * (self.img.size.height / self.imgView.frame.size.height);
 CGRect cropRect = CGRectMake(orgX, orgY, width, height);
 CGImageRef imgRef = CGImageCreateWithImageInRect(self.img.CGImage, cropRect);

 CGFloat deviceScale = [UIScreen mainScreen].scale;
 UIGraphicsBeginImageContextWithOptions(cropFrame.size, 0, deviceScale);
 CGContextRef context = UIGraphicsGetCurrentContext();
 CGContextTranslateCTM(context, 0, cropFrame.size.height);
 CGContextScaleCTM(context, 1, -1);
 CGContextDrawImage(context, CGRectMake(0, 0, cropFrame.size.width, cropFrame.size.height), imgRef);
 UIImage *newImg = UIGraphicsGetImageFromCurrentImageContext();
 CGImageRelease(imgRef);
 UIGraphicsEndImageContext();

 ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
 [library toolWriteImageToSavedPhotosAlbum:newImg.CGImage metadata:nil completionBlock:^(NSURL *assetURL, NSError *error) {
  if(error)
  {
   JGLog(@"写入出错");
  }
 } groupName:@"相册名称"];
}

CGContextTranslateCTM(context, 0, cropFrame.size.height);
CGContextScaleCTM(context, 1, -1);