Ios 使用UITextview调整字体大小

我想创建

UITextView

，它可以通过一个手指触摸（平移手势）进行缩放和旋转。但问题是文本字体大小没有正确缩放。请帮忙

它可以工作，但并不完美

-(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];
     }
}

-（void）resizeTranslate:（UIPangestureRecognitor*）识别器
{
if（[Recognitor state]==UIgestureRecognitzerState开始）
{
prevPoint=[识别器位置视图：vw_txtfield.superview]；
[vw_txtfield设置需要显示]；
olddistance=sqrt（功率（（vw_txtfield.frame.origin.x-prevPoint.x），2.0）+功率（（vw_txtfield.frame.origin.y-prevPoint.y），2.0）；
}
else if（[Recognitor state]==UIgestureRecognitzerStateChanged）
{
CGPoint point=[识别器位置视图：vw_txtfield.superview]；
newdistance=sqrt（功率（（vw_txtfield.frame.origin.x-point.x），2.0）+功率（（vw_txtfield.frame.origin.y-point.y），2.0）；
浮动wChange=0.0，hChange=0.0；
wChange=newdistance/olddistance；//减慢增量
NSLog（@“wchange%f”，wchange）；
hChange=新距离/旧距离；
NSLog（@“hchange%f”，hchange）；
如果（txt_LableText.font.pointSize）添加了一些代码，那么我们可以帮助您。您的
UITextView
是可编辑的吗？一个想法：尝试使用
UITextView
的初始帧，而不是使用最后一帧。这可能会奏效。您喜欢这个问题吗？