需求描述
1. 发布信息时,通过键盘键入@符号,或者点选相关功能键,唤醒@列表,进行选择
2.选择结束后,输入栏改色显示相关内容
3.删除时,整体删除@区块,且不能让光标落在@区块之间
实现步骤
1. 键入@符号,触发相关功能
1 - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{ 2 //判断键入的字符 3 if ([text isEqualToString:@"@"]) { 4 //触发相关功能 5 //[self pickRemaidBtnClick]; 6 return NO; 7 } 8 9 return YES; 10 }
2. @区块颜色修改
(1)使用到的正则表达式
#define kATRegular @"@[\\u4e00-\\u9fa5\\w\\-\\_]+ "
(2)获取匹配到的区块下标数组
+ (NSArray *) getMatchsWithStr : (NSString *) text { // 找到文本中所有的@ NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:kATRegular options:NSRegularExpressionCaseInsensitive error:nil]; NSArray *matches = [regex matchesInString:text options:NSMatchingReportProgress range:NSMakeRange(0, [text length])]; return matches; }
(3)修改文本颜色
-(void)textViewDidChange:(UITextView *)textView { NSArray *matchs = [RemaidUserUtils getMatchsWithStr:textView.text]; //改色 [textView.textStorage addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithHexString:@"#333333"] range:NSMakeRange(0, textView.text.length)]; for (NSTextCheckingResult *match in matchs) { [textView.textStorage addAttribute:NSForegroundColorAttributeName value:BLUECOLOR range:NSMakeRange(match.range.location, match.range.length - 1)]; } }
3.删除时整体删除@区块
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{ if ([text isEqualToString:@""]) { NSRange selectRange = textView.selectedRange; if (selectRange.length > 0) { //用户长按选择文本时不处理 return YES; } // 判断删除的是一个@中间的字符就整体删除 NSMutableString *string = [NSMutableString stringWithString:textView.text]; NSArray *matches = [RemaidUserUtils getMatchsWithStr:string]; BOOL inAt = NO; NSInteger index = range.location; for (NSTextCheckingResult *match in matches) { NSRange newRange = NSMakeRange(match.range.location + 1, match.range.length - 1); if (NSLocationInRange(range.location, newRange)) { inAt = YES; index = match.range.location; [textView.textStorage replaceCharactersInRange:match.range withString:@""]; textView.selectedRange = NSMakeRange(index, 0); [self textViewDidChange:textView]; return NO; break; } } } return YES; }
4.不允许光标落在@区块之间
- (void)textViewDidChangeSelection:(UITextView *)textView { // 光标不能点落在@词中间 NSRange range = textView.selectedRange; if (range.length > 0) { // 选择文本时可以 return; } NSArray *matches = [RemaidUserUtils getMatchsWithStr:textView.text]; for (NSTextCheckingResult *match in matches) { NSRange newRange = NSMakeRange(match.range.location + 1, match.range.length - 1); if (NSLocationInRange(range.location, newRange)) { if (range.location == match.range.location + 1) { textView.selectedRange = NSMakeRange(match.range.location + match.range.length, 0); } else { textView.selectedRange = NSMakeRange(match.range.location , 0); } break; } } }
BY: chu
原文地址:https://www.cnblogs.com/widgetbox/p/11957484.html
时间: 2024-10-21 09:08:57