在attributedString中加入subAttributed

//http://stackoverflow.com/questions/19551856/how-would-i-create-a-uibutton-with-two-lines-of-text-and-the-first-line-of-text

const CGFloat fontSize = 13;
UIFont *boldFont = [UIFont boldSystemFontOfSize:fontSize];
UIFont *regularFont = [UIFont systemFontOfSize:fontSize];
//UIColor *foregroundColor = [UIColor whiteColor];

// Create the attributes
NSDictionary *attrs = [NSDictionary dictionaryWithObjectsAndKeys:
                               regularFont, NSFontAttributeName, nil];
NSDictionary *subAttrs = [NSDictionary dictionaryWithObjectsAndKeys:
                                  boldFont, NSFontAttributeName, nil];
const NSRange range = NSMakeRange(iFrom,iTo - iFrom);

// Create the attributed string (text + attributes)
NSMutableAttributedString *attributedText =
[[NSMutableAttributedString alloc] initWithString:aText
                                               attributes:attrs];
[attributedText setAttributes:subAttrs range:range];

// Set it in our UILabel and we are done!
[aLabel setAttributedText:attributedText];