NSAttributedString设置文本的位置

最新推荐文章于 2021-01-26 16:45:02 发布

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最新推荐文章于 2021-01-26 16:45:02 发布

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分类专栏：技术文章标签： NSAttributedString设置 NSAttributedString文字

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NSAttributedString作为一种强大的文本处理工具，常用于复杂的文本布局和格式设定。本文将深入探讨如何精准设置NSAttributedString中文本的位置，助你更好地掌握这一技术。

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//1. 如NSAttributedString与iOS上的核心文本，你有CTParagraphStyle而不是NSParagraphStyle。没有可变的变体。 例如：
CTTextAlignment alignment = kCTCenterTextAlignment;
CTParagraphStyleSetting alignmentSetting;
alignmentSetting.spec = kCTParagraphStyleSpecifierAlignment;
alignmentSetting.valueSize = sizeof(CTTextAlignment);
alignmentSetting.value = &alignment;
CTParagraphStyleSetting settings[1] = {alignmentSetting};
CFIndex settingCount = 1;
CTParagraphStyleRef paragraphRef = CTParagraphStyleCreate(settings, settingsCount);
NSDictionary *attributes = @{(__bridge id)kCTParagraphStyleAttributeName : (__bridge id)paragraphRef};
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:@"Hello World" attributes:attributes];

//2.
NSMutableParagraphStyle *paragrapStyle = [[NSMutableParagraphStyle alloc] init];
paragrapStyle.alignment = NSTextAlignmentCenter;
NSDictionary *attributes = @{
        NSParagraphStyleAttributeName: paragrapStyle
        };
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:text attributes:attributes];

//3. 我正在寻找的问题，并能中心对齐在NSAttributedString的文字是这样的：
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init] ;
[paragraphStyle setAlignment:NSTextAlignmentCenter];
NSMutableAttributedString *attribString = [[NSMutableAttributedString alloc]initWithString:string];
[attribString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [string length])];

//4.
  [averagRatioArray addObject:[NSString stringWithFormat:@"When you respond Yes to %@ the average response to %@ was %0.02f",QString1,QString2,M1]];
  [averagRatioArray addObject:[NSString stringWithFormat:@"When you respond No to %@ the average response to %@ was %0.02f",QString1,QString2,M0]];
  UIFont *font2 = [UIFont fontWithName:@"Helvetica-Bold" size:15];
  UIFont *font = [UIFont fontWithName:@"Helvetica-Bold" size:12];
  NSMutableAttributedString *str=[[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"When you respond Yes to %@ the average response to %@ was",QString1,QString2]];
  [str addAttribute:NSFontAttributeName value:font range:NSMakeRange(0,[@"When you respond Yes to " length])];
  [str addAttribute:NSFontAttributeName value:font2 range:NSMakeRange([@"When you respond Yes to " length],[QString1 length])];
  [str addAttribute:NSFontAttributeName value:font range:NSMakeRange([QString1 length],[@" the average response to " length])];
  [str addAttribute:NSFontAttributeName value:font2 range:NSMakeRange([@" the average response to " length],[QString2 length])];
  [str addAttribute:NSFontAttributeName value:font range:NSMakeRange([QString2 length] ,[@" was" length])];
  // [str addAttribute:NSFontAttributeName value:font2 range:NSMakeRange(49+[QString1 length]+[QString2 length] ,8)];
  [averagRatioArray addObject:[NSString stringWithFormat:@"%@",str]];

NSAttributedString设置太常用了，功能也蛮强大的！好好学学