textView字数限制

//正在改变
- (void)textViewDidChange:(UITextView *)textView
{
    NSLog(@"%@", textView.text);
    //实时显示字数
    self.strlength.text = [NSString stringWithFormat:@"%lu/120", (unsigned long)textView.text.length];
    
    //字数限制操作
    if (textView.text.length >= 120) {
        
        textView.text = [textView.text substringToIndex:120];
        self.strlength.text = @"120/120";
        SHOW_ALERT(@"最多只能输入120字");
    } else {
    }
   
}

#pragma mark  - lazy
- (TextViewPlaceHolder *)textView
{
    if (!_textView) {
        _textView = [[TextViewPlaceHolder alloc]init];
        _textView.delegate = self;
        _textView.placeholder = @"请发表您的评论...";
        _textView.font = SFONT(ChangeSizeNOPlus(16));
    }
    return _textView;
}

- (UILabel *)strlength
{
    if (!_strlength) {
        _strlength = [[UILabel alloc]init];
        _strlength.font = SFONT(ChangeSizeNOPlus(13));
        _strlength.textColor = Text_Color;
        _strlength.text = @"0/120";
    }
    return _strlength;
}

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