我想创建UITextView缩放并用手指触摸旋转（平移手势）。但问题是文本字体大小未正确缩放。请帮忙。
它有效但不完美。
-(void)resizeTranslate:(UIPanGestureRecognizer *)recognizer
{
if ([recognizer state]== UIGestureRecognizerStateBegan)
{
prevPoint = [recognizer locationInView:vw_txtfield.superview];
[vw_txtfield setNeedsDisplay];
olddistance = sqrt(pow((vw_txtfield.frame.origin.x - prevPoint.x), 2.0) + pow((vw_txtfield.frame.origin.y - prevPoint.y), 2.0));
}
else if ([recognizer state] == UIGestureRecognizerStateChanged)
{
CGPoint point = [recognizer locationInView:vw_txtfield.superview];
newdistance = sqrt(pow((vw_txtfield.frame.origin.x - point.x), 2.0) + pow((vw_txtfield.frame.origin.y - point.y), 2.0));
float wChange = 0.0, hChange = 0.0;
wChange = newdistance / olddistance ;//Slow down increment
NSLog(@"wchange %f",wChange);
hChange= newdistance / olddistance;
NSLog(@"hchange %f",hChange);
if (txt_LableText.font.pointSize<=6 && wChange<1) {
return;
}
else
{
vw_txtfield.bounds = CGRectMake(vw_txtfield.bounds.origin.x, vw_txtfield.bounds.origin.y, vw_txtfield.bounds.size.width * (wChange), vw_txtfield.bounds.size.height * (hChange));
[txt_LableText setContentScaleFactor: newdistance / olddistance ];
float int_NewFontsize= ( newdistance / olddistance) * txt_LableText.font.pointSize;
NSLog(@"font size %f",int_NewFontsize);
[txt_LableText setFont:[UIFont fontWithName:txt_LableText.font.fontName size:int_NewFontsize]];
prevPoint = [recognizer locationInView:vw_txtfield.superview];
[vw_txtfield setNeedsDisplay];
olddistance = sqrt(pow((vw_txtfield.frame.origin.x - point.x), 2.0) + pow((vw_txtfield.frame.origin.y - point.y), 2.0));
}
}
else if ([recognizer state] == UIGestureRecognizerStateEnded)
{
prevPoint = [recognizer locationInView:vw_txtfield.superview];
[vw_txtfield setNeedsDisplay];
}
}