[英]How to get all NSRange of a particular character in a NSString?
I have two NSStrings: orgText
and searchLetter
. 我有两个NSStrings: orgText
和searchLetter
。
I want to highlight every occurrences of the searchLetter in the orgText
with a red color. 我想在该searchLetter的每一个出现的突出orgText
为红色。
How can I get the NSRange
of all occurrences of the searchLetter
? 我怎样才能获得NSRange
中所有出现的searchLetter
?
for eg : 例如:
suppose: orgText = "abcahaiapaoiuiapplma"
searchLetter = "a".
I want to hightlight all "a" occurrences in "abcahaiapaoiuiapplma" with red color. 我想高亮显示红色“abcahaiapaoiuiapplma”中的所有“a”事件。
Thanks. 谢谢。
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];
}
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;
}
}
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])];
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"]];
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