更改 NSMutableAttributedString 多个部分的属性

Question

我需要检查一个 NSMutableString 与我在最初是 NSString 时插入的值。

一个例子是：

NString* textToDraw = @"";
textToDraw = [textToDraw stringByAppendingString:[[NSString alloc] initWithFormat:@"       
Summary of currently worked on process\n\nTitle name:\nResults for Process\n    %@\n%@\n%@\n, resultOne, resultTwo, resultThree]];

resultOne、resultTwo、resultThree 只是标准的 NSString 值

然后我初始化一个 NSMutableAttributedString 以添加一些格式。

NSMutableAttributedString *summaryBody  = [[NSMutableAttributedString alloc]  initWithString:textToDraw];

CTFontRef centuryGothicStandard;
CTFontRef centuryGothicTitle;

centuryGothicStandard = CTFontCreateWithName(CFSTR("Century Gothic"), 12.0, nil);
centuryGothicTitle = CTFontCreateWithName(CFSTR("Century Gothic-Bold"), 24.0, nil);

//Modify the summary, so that the title is larger, and bolded, the subtitles are bolded, and the text is century gothic font
[summaryBody addAttribute:(id)kCTFontAttributeName
                    value:(__bridge id)centuryGothicStandard
                    range:NSMakeRange(0, [summaryBody length])];

我需要做的是将resultOne、resultTwo 和resultThree 修改为红色，我尝试了Change attributes of substrings in a NSAttributedString 中的答案解决方案，但我不明白这个概念。

我可以简单地遍历 NSMutableAttributedString 并找到我插入的特定字符，比如“|”作为起点和“？”为终点？ 我已经搜索了一个特定的索引，但没有任何与 NSAttributedMutatableString 相关的弹出，只是 NSRange，我不会具体知道。

这里有一些伪代码来帮助解释我认为可能的解决方案：

textToDraw = [textToDraw stringByAppendingString:[[NSString alloc] initWithFormat:@" Summary of currently worked on process\n\nTitle name:\nResults for Process\n    |%@?\n|%@?\n|%@?\n, resultOne, resultTwo, resultThree]];
(for int i = 0; i < [NSAttributedMutatableString length]; i++)
{
    if(char at i == '|')
    {
        get an NSRange from this value to the char at i == '?'
        [NSAttributedMutatableStringS addAttribute:(id)kCTForegroundColorAttributeName
                    value:(id)[UIColor redColor].CGColor
                    range:NSMakeRange(0, NSRangeAbove])];
    }
}

我目前可以获取resultOne之类的值，并创建带有改变颜色的附加属性的NSAttributedStrings，唯一的问题当然是不知道索引值，所以这是另一种可能。

Answer 1

如果您确定它们永远不会出现在 resultX 字符串中，则可以搜索起始字符或字符序列...

一种方法是逐段构建字符串并动态创建范围数组。最后，您只需将属性打在他们身上。

NSMutableString *mTextToDraw = [[NSMutableString alloc] init];
NSMutableArray *mRangesToMod = [[NSMutableArray alloc] init];
NSValue *mRange = nil;

[mTextToDraw appendFormat:@"Summary of currently worked on process\n\nTitle name:\nResults for Process\n    "];

mRange = [NSValue valueWithRange:NSMakeRange(mTextToDraw.length,resultOne.length)];;
[mRangesToMod addObject: mRange];
[mString appendFormat:@"%@\n",resultOne];

mRange = [NSValue valueWithRange:NSMakeRange(mTextToDraw.length,resultTwo.length)];;
[mRangesToMod addObject: mRange];
[mString appendFormat:@"%@\n",resultTwo];

mRange = [NSValue valueWithRange:NSMakeRange(mTextToDraw.length,resultThree.length)];;
[mRangesToMod addObject: mRange];
[mString appendFormat:@"%@\n",resultThree];

NSMutableAttributedString *summaryBody = [[NSMutableAttributedString alloc] initWithString:mTextToDraw];

for (NSValue *vRange in mRangesToMod)
{
    NSRange range = vRange.rangeValue;

    [summaryBody setAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Roboto-Light" size:smallFont]}
                         range:range];

    // or you can use addAttribute...
}

我在我的应用中使用了“Roboto-Light”——它在你的应用中无法正常工作。举个例子。为了测试，只需在基本（原始）字体之外放一些字体......