如何通过捏合手势使UITextView可调整大小以及缩放（调整大小）它的能力。
问题是在使用旋转调整大小时会变得模糊。
以下是我的代码：
- (void)handlePinchOrRotateGesture:(UIGestureRecognizer *)recognizer
{
switch (recognizer.state) {
case UIGestureRecognizerStateBegan: {
if ([recognizer isKindOfClass:[UIRotationGestureRecognizer class]]) {
self.currentRotateTransform = self.referenceRotateTransform;
self.activeRotationRecognizer = (UIRotationGestureRecognizer *)recognizer;
} else {
NSLog(@"height %f, width %f",currentTF.frame.size.height,currentTF.frame.size.width);
self.activePinchRecognizer = (UIPinchGestureRecognizer *)recognizer;
}
break;
}
case UIGestureRecognizerStateChanged: {
CGAffineTransform currentTransform = self.referenceRotateTransform;
if ([recognizer isKindOfClass:[UIRotationGestureRecognizer class]]) {
self.currentRotateTransform = [self.class applyRecognizer:recognizer toTransform:self.referenceRotateTransform];
}
currentTransform = [self.class applyRecognizer:self.activePinchRecognizer toTransform:currentTransform];
currentTransform = [self.class applyRecognizer:self.activeRotationRecognizer toTransform:currentTransform];
currentTF.transform = currentTransform;
break;
}
case UIGestureRecognizerStateEnded:
{
CGAffineTransform currentTransform = self.referenceRotateTransform;
if ([recognizer isKindOfClass:[UIRotationGestureRecognizer class]]) {
self.referenceRotateTransform = [self.class applyRecognizer:recognizer toTransform:self.referenceRotateTransform];
self.currentRotateTransform = self.referenceRotateTransform;
self.activeRotationRecognizer = nil;
} else if ([recognizer isKindOfClass:[UIPinchGestureRecognizer class]]) {
self.scale *= [(UIPinchGestureRecognizer *)recognizer scale];
self.activePinchRecognizer = nil;
CGFloat currentFontSize = fontSize * _scale;
if (!isRotaed)
{
if (CGPointEqualToPoint(self.referenceCenter, CGPointZero)) {
currentTF.center = CGPointMake(CGRectGetMidX(self.view.bounds),
CGRectGetMidY(self.view.bounds));
}
currentTransform = [self.class applyRecognizer:self.activePinchRecognizer toTransform:currentTransform];
NSLog(@"height %f, width %f",currentTF.frame.size.height,currentTF.frame.size.width);
currentTF.transform = currentTransform;
UITextView *newText = [[UITextView alloc]init];
newText.scrollEnabled=YES;
newText.text=currentTF.text;
newText.font =[UIFont fontWithName:strFont size:currentFontSize];
[newText sizeToFit];
newText.scrollEnabled=NO;
currentTF.font = [UIFont fontWithName:strFont size:currentFontSize];
NSLog(@"height %f, width %f",currentTF.frame.size.height,currentTF.frame.size.width);
currentTF.frame =CGRectIntegral(newText.frame);
currentTF.center = CGPointMake(CGRectGetMidX(self.veText.bounds),
CGRectGetMidY(self.veText.bounds));
}
}
break;
}
default:
break;
}
}
+ (CGAffineTransform)applyRecognizer:(UIGestureRecognizer *)recognizer toTransform:(CGAffineTransform)transform
{
if (!recognizer
|| !([recognizer isKindOfClass:[UIRotationGestureRecognizer class]]
|| [recognizer isKindOfClass:[UIPinchGestureRecognizer class]])) {
return transform;
}
if ([recognizer isKindOfClass:[UIRotationGestureRecognizer class]]) {
return CGAffineTransformRotate(transform, [(UIRotationGestureRecognizer *)recognizer rotation]);
}
CGFloat scale = [(UIPinchGestureRecognizer *)recognizer scale];
return CGAffineTransformScale(transform, scale, scale);
}