kCTUnderlineStyleSingle對某些字符不起作用

Question

我正在使用NSAttributedstring，屬性kCTUnderlineStyleSingle。 字符正確下劃線。但某些字符如g，q，p無法正常顯示。

即使用戶也無法區分g和q。

有沒有解決方案？

Answer 1

您可以使用此方法解決它：

- (void)addUnderlineWithRange:(NSRange)range 
{ 
    int lineThickness = [EnvUtils isIpadEnv] ? 2 : 1; 
    UIColor *lineColor = self.textColor; 
    NSString *string = self.text; 

    CGRect labelFrame = self.frame; 
    CGSize expectedLabelSize = [NSString getMultilineTextSize:[string substringWithRange:range] forMaxSize:labelFrame.size font:self.font]; 
    CGSize expectedLabelFullSize = [NSString getMultilineTextSize:string forMaxSize:labelFrame.size font:self.font]; 

    CGSize xOffset = [NSString getMultilineTextSize:[string substringWithRange:NSMakeRange(0, range.location)] forMaxSize:labelFrame.size font:self.font]; 

    CGFloat originX = (labelFrame.size.width - expectedLabelFullSize.width)/2 + xOffset.width; 
    CGFloat originY = expectedLabelSize.height + (labelFrame.size.height - expectedLabelFullSize.height)/2; 
    CGRect lineFrame = CGRectMake(originX, originY, expectedLabelSize.width, lineThickness); 

    UIView *lineView = [[[UIView alloc] initWithFrame:lineFrame] autorelease]; 
    lineView.backgroundColor = lineColor; 

    [self.superview addSubview:lineView]; 
}