UITextView(YYTextView) limits the number of input characters

Use AllInputNo to record the maximum number of input characters. canInputNo to record the remaining input characters.

@property (nonatomic ,assign) NSInteger AllInputNo;
@property (nonatomic ,assign) NSInteger canInputNo;

Then there are mainly two methods:

- (BOOL)textView:(YYTextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    //输入之后所有的字符是否超出了界限,能够检测出粘贴
    NSString *str = [NSString stringWithFormat:@"%@%@", textView.text, text];
    if (str.length > self.AllInputNo) {
        textView.text = [str substringToIndex:self.AllInputNo];
//        return NO;
    }
    return YES;
}

- (void)textViewDidChange:(YYTextView *)textView {

    //该判断用于联想输入
    if (textView.text.length > self.AllInputNo) {

        textView.text = [textView.text substringToIndex:self.AllInputNo];
    }
    self.canInputNo = self.AllInputNo - textView.text.length;
}