对textView的输入个数进行判断代码,ObjC代码库,德仔网

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【ObjC】对textView的输入个数进行判断

作者:伯钊 / 发布于2014/11/17/ 375

首先需要对textview输入框加上代理实现代理才能调用这个方法；


	- (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;
	}
	}

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　textView　　输入个数　

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