如何更改某个属性字符串的文本颜色或使其变为粗体？

Question

说我有NSString*hello = @"hello world";

现在我想要一个有问题的字符串,其中hello world中的地狱是粗体.

网络上有一个功能:

- (NSMutableAttributedString*) word:(NSString*)substringToHighlight{

    NSMutableAttributedString * mutableAttributedString = [[ NSMutableAttributedString alloc]initWithString:self];
    NSUInteger count = 0, length = [mutableAttributedString length];
    NSRange range = NSMakeRange(0, length);

    count = 0,
    length = [mutableAttributedString length];
    range = NSMakeRange(0, length);
    while(range.location != NSNotFound)
    {
        range = [[mutableAttributedString string] rangeOfString:substringToHighlight options:0 range:range];
        if(range.location != NSNotFound) {

            //[mutableAttributedString setTextColor:[UIColor blueColor] range:NSMakeRange(range.location, [word length])];
            range = NSMakeRange(range.location + range.length, length - (range.location + range.length));
            count++;
        }
    }
    return mutableAttributedString;
}

但是,该函数不起作用,因为mutableAttributedString不支持setTextColor

我也试过了

NSDictionary * dict = @{kCTFontAttributeName:boldFontName};
        [mutableAttributedString setAttributes:{kCTFontAttributeName:boldFontName} range:NSMakeRange(range.location, substringToHighlight.length)];

但得到了一条消息kCTFontAttributeName未定义.

Answer 1

您可以使用rangeOfString:options:range:或NSScanner(还有其他可能性,如regexps但无论如何).

根据给定的选项,在给定的接收器范围内查找并返回给定字符串第一次出现的范围.

• (NSRange)rangeOfString:(NSString *)aString options:(NSStringCompareOptions)mask range:(NSRange)aRange

这是另一种解决方案:

然后你需要转换成NSMutableAttributedString这样的方式.

NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:@"hello world"];
NSRange selectedRange = NSMakeRange(0, 4); // 4 characters, starting at index 0

[string beginEditing];

[string addAttribute:NSFontAttributeName
           value:[NSFont fontWithName:@"Helvetica-Bold" size:12.0]
           range:selectedRange];

[string endEditing];

我认为这是最好的解决方案.