如何在NSString中获取特定字符的所有NSRange？

I have two NSStrings: orgText and searchLetter.
I want to highlight every occurrences of the searchLetter in the orgText with a red color.
How can I get the NSRange of all occurrences of the searchLetter ?
for eg :

我有两个NSStrings：orgText和searchLetter。我想用红色突出显示orgText中每次出现的searchLetter。如何获取所有出现的searchLetter的NSRange？例如：

suppose: orgText = "abcahaiapaoiuiapplma"
         searchLetter = "a".

I want to hightlight all "a" occurrences in "abcahaiapaoiuiapplma" with red color.
Thanks.

我想高亮显示红色“abcahaiapaoiuiapplma”中的所有“a”事件。谢谢。

4 个解决方案

#1

I wrote this method for my project - SUITextView with highlight:

我为我的项目编写了这个方法 - 带有高亮显示的SUITextView：

- (NSMutableAttributedString*) setColor:(UIColor*)color word:(NSString*)word inText:(NSMutableAttributedString*)mutableAttributedString {

    NSUInteger count = 0, length = [mutableAttributedString length];
    NSRange range = NSMakeRange(0, length);

    while(range.location != NSNotFound)
    {
        range = [[mutableAttributedString string] rangeOfString:word options:0 range:range];
        if(range.location != NSNotFound) {
            [mutableAttributedString setTextColor:color range:NSMakeRange(range.location, [word length])];
            range = NSMakeRange(range.location + range.length, length - (range.location + range.length));
            count++; 
        }
    }

    return mutableAttributedString;
}

And in my category of NSMutableAttributedString:

在我的NSMutableAttributedString类别中：

- (void) setTextColor:(UIColor*)color range:(NSRange)range {
    // kCTForegroundColorAttributeName
    [self removeAttribute:(NSString*)kCTForegroundColorAttributeName range:range]; // Work around for Apple leak
    [self addAttribute:(NSString*)kCTForegroundColorAttributeName value:(id)color.CGColor range:range];
}

#2

I'm not seeing any solution with regular expression, so I've created an elegant one, it may be useful for someone in the future.

我没有看到任何正则表达式的解决方案，所以我创建了一个优雅的解决方案，它可能对将来的某个人有用。

- (BOOL)highlightString:(NSString *)string inText:(NSMutableAttributedString *)attributedString withColour:(UIColor *)color {
    NSError *_error;
    NSRegularExpression *_regexp = [NSRegularExpression regularExpressionWithPattern:string options:NSRegularExpressionCaseInsensitive error:&_error];
    if (_error == nil) {
        [_regexp enumerateMatchesInString:attributedString.string options:NSMatchingReportProgress range:NSMakeRange(0, attributedString.string.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
            if (result.numberOfRanges > 0) {
                for (int i = 0; i < result.numberOfRanges; i++) {
                    [attributedString addAttribute:NSBackgroundColorAttributeName value:color range:[result rangeAtIndex:i]];
                }
            }
        }];
        return TRUE;
    } else {
        return FALSE;
    }
}

#3

Code crash at "setTextColor" for MutableAttributeString

MutableAttributeString的“setTextColor”代码崩溃

instead of it use below code

而不是使用下面的代码

NSDictionary *tempdict=[NSDictionary dictionaryWithObjectsAndKeys:[UIFont boldSystemFontOfSize:12.0],NSFontAttributeName,color,NSForegroundColorAttributeName, nil];
[mutableAttributedString setAttributes:tempdict range:NSMakeRange(range.location, [word length])];

#4

-1

this is an easier way of doing it

这是一种更简单的方法

NSString *str = @"hello world";
NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithString:str];
[attr addAttributes:@{NSForegroundColorAttributeName : [UIColor redColor]} 
              range:[str rangeOfString:@"world"]];

#1