多個關鍵字高亮
在做搜尋時，經常用到關鍵字高亮。以下是我的專案用到的關鍵字高亮。
1 //關鍵字陣列 關鍵字顏色
[lb setAttributedText:text withRegularPattern:[text regularPattern:keyArr] attributes:@{ NSForegroundColorAttributeName : [UIColor redColor]}];
2
/**
關鍵字 正則判斷
*/
-(NSString *)regularPattern:(NSArray *)keys{
NSMutableString *pattern = [[NSMutableString alloc]initWithString:@"(?i)"];
for (NSString *key in keys) {
[pattern appendFormat:@"%@|",key];
}
return pattern;
}
3
/**
關鍵字高亮設定
*/
- (void)setAttributedText:(NSString *)text
withRegularExpression:(NSRegularExpression *)expression
attributes:(NSDictionary *)attributesDict
{
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:text];
[expression enumerateMatchesInString:text
options:0
range:NSMakeRange(0, [text length])
usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
NSRange matchRange = [result range];
if (attributesDict) {
[attributedString addAttributes:attributesDict range:matchRange];
}
if ([result resultType] == NSTextCheckingTypeLink) {
NSURL *url = [result URL];
[attributedString addAttribute:NSLinkAttributeName value:url range:matchRange];
}
}];
[self setAttributedText:attributedString];
}