iOS 中 UITextView 限制最大输入字数

显示UITextView最大输入字数的代码

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    //如果是删除减少字数，都返回允许修改
    if ([text isEqualToString:@""]) {
        return YES;
    }
    if (range.location>= MaxCount)
    {
        return NO;
    }
    else
    {
        return YES;
    }
}
- (void)textViewDidChange:(UITextView *)textView {
    [self updateRemainCount];
}
- (void)updateRemainCount {
    long count = MAX(0, (int)(MaxCount - self.textView.text.length));
    self.lbRemainCount.text = [NSString stringWithFormat:@"当前可输入文字：%ld",count];
}