如何在搜索时突出显示UILabel格式的电话号码

Question

如何在搜索时用格式化的电话号码突出显示UILabel？

示例：

一个单元格显示联系人列表，其号码为：[phone]

如果我键入3，我希望+和3突出显示(颜色不同(

如果我键入38160，我希望+381 60高亮显示(颜色不同(。

等等…

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这个问题的要点是如何通过跳过空格和+号来给匹配的数字上色？

以下是我迄今为止尝试过的内容，但只有当我从标签的文本值中删除空格和+号时，它才有效：

// Highlighted search for numbers
NSString *phoneString = @"[phone]";
NSString *searchString = @"38160";
NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:phoneString];
NSRange selectedRange = [[string string] rangeOfString:searchString options:NSRegularExpressionSearch];
if (selectedRange.location != NSNotFound) {
[string beginEditing];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:selectedRange];
[string endEditing];
}
cell.phoneNumberLabel.attributedText = string;

Answer 1

感谢@Larme，我已经回答了我自己的问题：(

// Highlighted search for numbers
NSString *phoneString = @"[phone]";
NSString *firstComponent = @"\+?"; // Skip a leading + char
NSMutableArray *digits = [[NSMutableArray alloc] init];
[self.searchString enumerateSubstringsInRange:NSMakeRange(0, [self.searchString length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull stop) {
[digits addObject:substring];
}];
NSString *pattern = [[NSString alloc] initWithFormat:@"%@%@", firstComponent, [digits componentsJoinedByString:@"\s?"]];
NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:phoneString];
NSRange selectedRange = [[string string] rangeOfString:pattern options:NSRegularExpressionSearch];
if (selectedRange.location != NSNotFound) {
[string beginEditing];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:selectedRange];
[string endEditing];
}
cell.phoneNumberLabel.attributedText = string;