UILabel结合了字体大小

Question

I use a UITextField to input text and automatically the UILabel shows that text.

Now, I want to increase the second character's font size, ONLY if user typed 3 characters, if user typed less or more than 3, then all characters should get the default font size.

See attached image.

I want to use NSAttributedText, but I don't know how to increase the second character size only.

Answer 1

Here's what you do:

NSMutableAttributedString *text = [[myTextField attributedText] mutableCopy];
NSDictionary *sizeAttributes = @{NSFontAttributeName:[UIFont systemFontOfSize:24.0]};
NSRange secondChar = NSMakeRange(1,1);
[text setAttributes:sizeAttributes range:secondChar];
[myTextField setAttributedText:text];
// might want to release text here, to avoid memory leak