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- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{ /* if ([text isEqualToString:@"\n"]) { [textView resignFirstResponder]; return NO; }else if([textView.text length] >= 30 && ![text isEqualToString:@""]){ return NO; } return YES; */// return YES; int _textMaxLength = 60; if (_textMaxLength == 0) { return YES; } void(^dealWithTexts)(void) = ^() { NSString *textInField = [textView.text substringToIndex:range.location]; int inputedHanzi = [[textInField componentsMatchedByRegex:@"[\u4e00-\u9fa5]"] count]; int inputedLength = textInField.length + inputedHanzi; int allowedLength = _textMaxLength - inputedLength; int length = 0; int stop = text.length; for (int i = 0; i < text.length; i++) { NSString *c = [text substringWithRange:NSMakeRange(i, 1)]; if ([c isMatchedByRegex:@"[\u4e00-\u9fa5]"]) { if (length + 2 > allowedLength) { stop = i; break; } length += 2; } else { if (length + 1 > allowedLength) { stop = i; break; } length++; } } NSString *shouldAddedString = [text substringToIndex:stop]; NSString *textShouldInField = [NSString stringWithFormat:@"%@%@",textInField,shouldAddedString]; [textView performSelector:@selector(setText:) withObject:textShouldInField afterDelay:0.0]; }; if ( 1 == range.length && text.length == 0) { return YES; //删除 } else if (range.length > 1) { dealWithTexts(); return YES; } else { NSString * text2 = [textView.text stringByReplacingCharactersInRange:range withString:text]; text2 = [text2 stringByReplacingOccurrencesOfRegex:@"[\u4e00-\u9fa5]" withString:@"##"]; int symbol = [[text2 componentsMatchedByRegex:@"\u2006"] count]; if ( _textMaxLength > 0 && text2.length - symbol > _textMaxLength ) { if (text.length > 1) { dealWithTexts(); return YES; } return NO; } return YES; }}标签：
原文地址：http://www.cnblogs.com/-ios/p/4670052.html
