调整字体大小以填充UITextView？ [英] Resize font size to fill UITextView?

问题描述

我如何设置UITextView中的文本的字体大小，以便它填充整个UITextView？我想让用户输入他们的文本，然后让文本填充整个UITextView。

How would I set the font size of text in a UITextView such that it fills the entire UITextView? I'd like the user to type in their text, then have the text fill the entire UITextView.

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推荐答案

在UITextView的类别中，应该做的伎俩。为什么您需要Fudgefactor，请参见此帖

This, in a category on UITextView, should do the trick. For why you need the fudgefactor, see this post

#define kMaxFieldHeight 9999 

-(BOOL)sizeFontToFit:(NSString*)aString minSize:(float)aMinFontSize maxSize:(float)aMaxFontSize 
{   
float fudgeFactor = 16.0;
float fontSize = aMaxFontSize;

self.font = [self.font fontWithSize:fontSize];

CGSize tallerSize = CGSizeMake(self.frame.size.width-fudgeFactor,kMaxFieldHeight);
CGSize stringSize = [aString sizeWithFont:self.font constrainedToSize:tallerSize lineBreakMode:UILineBreakModeWordWrap];

while (stringSize.height >= self.frame.size.height)
       {
       if (fontSize <= aMinFontSize) // it just won't fit
           return NO;

       fontSize -= 1.0;
       self.font = [self.font fontWithSize:fontSize];
       tallerSize = CGSizeMake(self.frame.size.width-fudgeFactor,kMaxFieldHeight);
       stringSize = [aString sizeWithFont:self.font constrainedToSize:tallerSize lineBreakMode:UILineBreakModeWordWrap];
       }

return YES; 
}

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