[英]Handling NSRange In UITableViewCell
我在NSRange
遇到了一些問題。 我有一個CommentViewController
可以正常工作,但是我想擁有一個tapGesture
並在@之后更改文本的顏色,就像Twitter上提到的那樣。 由於某些原因,在某些單元格中,所有文本都會更改顏色,而不僅僅是提及。 這是代碼:
NSMutableAttributedString * string = [[NSMutableAttributedString alloc]initWithString:message[@"text"]];
NSArray *words=[message[@"text"] componentsSeparatedByString:@""];
for (NSString *word in words) {
if ([word hasPrefix:@"@"]) {
NSRange range=[message[@"text"] rangeOfString:word];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:range];
}
}
[cell.bodyLabel setAttributedText:string];
我在做什么錯,我該如何在彩色部分添加手勢?
更換
NSArray *words=[message[@"text"] componentsSeparatedByString:@""];
用
NSArray *words=[message[@"text"] componentsSeparatedByString:@" "];
分隔單詞而不是字母時,應使用空格分隔組成部分!!
你有試過嗎
NSMutableAttributedString *attributedString =[[NSMutableAttributedString alloc] initWithString:message[@"text"]];
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(@[A-Za-z0-9]*)" options:kNilOptions error:nil];
NSRange range = NSMakeRange(0,message[@"text"].length);
[regex enumerateMatchesInString:message[@"text"] options:kNilOptions range:range usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
NSRange subStringRange = [result rangeAtIndex:1];
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:subStringRange];
}];
cell.bodyLabel.attributedText = attributedString;
NSString *message = @"hello@gmail.com";
NSRange initialRange = [message rangeOfString:@"@"];
NSRange endRange = [message rangeOfString:@"."];
NSUInteger length = endRange.location - initialRange.location;
NSRange markupRange = NSMakeRange(initialRange.location, length);
NSMutableAttributedString * attString = [[NSMutableAttributedString alloc]initWithString:message];
[attString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:markupRange];
[cell.bodyLabel setAttributedText:attString];
這相當粗糙,建議您添加一些條件檢查,以確保不會因崩潰而崩潰。 @之前,但確實可以。
請嘗試這個
NSMutableAttributedString *attributedString =[[NSMutableAttributedString alloc] initWithString:message[@"text"]];
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(@[A-Za-z0-9]*)" options:kNilOptions error:nil];
NSArray *a = [message[@"text"]componentsSeparatedByString:@" "];
for (NSString *str in a)
{
NSRange range = NSMakeRange(0,str.length);
[regex enumerateMatchesInString:str options:kNilOptions range:range usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
NSRange subStringRange = [result rangeAtIndex:1];
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:subStringRange];
}];
label.attributedText = attributedString;
}
我想通了。 在大多數情況下,我認為這是正則表達式的問題! 這是我的最終代碼:
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:strFirst];
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor darkGrayColor] range:(NSRange){0, strFirst.length}];
UIColor *mentionColor = [UIColor hx_colorWithHexRGBAString:@"2cb8f6"];
NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[#@](\\w+)" options:0 error:&error];
NSArray *matches = [regex matchesInString:strFirst options:0 range:NSMakeRange(0, strFirst.length)];
for (NSTextCheckingResult *match in matches) {
NSRange wordRange = [match rangeAtIndex:0];
// NSString *word = [strFirst substringWithRange:wordRange];
[attributedString addAttribute:NSForegroundColorAttributeName
value: mentionColor
range:wordRange];
}
cell.bodyLabel.attributedText = attributedString;
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