step1.
首先要創一個 ViewController
step2.
在ViewController 後面加上UITextViewDelegate 如下
@interface ViewController ()<UITextViewDelegate >
{
        UITextView * commentTextView;
        UITextView * realCommentTextView;
}step3.
在ViewController 的viewDidLoad
//新增一個bottomview
 UIToolbar *bottomView = [[UIToolbar alloc] initWithFrame:CGRectMake(0,[UIScreen mainScreen].bounds.size.height-49, 320, 49)];
    [self.view addSubview:bottomView];
    bottomView.backgroundColor = [UIColor blackColor];
    bottomView.tintColor = [UIColor grayColor];
//新增一個輸入textview
    commentTextView = [[UITextView alloc] initWithFrame:CGRectMake(8, 10, 250, 30)];
    [bottomView addSubview:commentTextView];
    commentTextView.delegate = self;
    commentTextView.backgroundColor = [UIColor whiteColor];
    [commentTextView.layer setCornerRadius:5];
    commentTextView.clipsToBounds = YES;
    [commentTextView.layer setBorderWidth: 1.0];
    [commentTextView.layer setBorderColor: [[UIColor grayColor] CGColor]];
    commentTextView.font = [UIFont systemFontOfSize:16];
//新增一個輸入button
    UIButton *commentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    commentButton.frame = CGRectMake(265, 10, 45, 30);
    [commentButton setTitle:NSLocalizedString(@"Send", nil) forState:UIControlStateNormal];
    [bottomView addSubview: commentButton];
    [commentButton addTarget:self action:@selector(addCommentButPressed:) forControlEvents:UIControlEventTouchUpInside];
step4.
在新增點下後的樣子
//新增一個bottomview
UIToolbar *bottomView2 = [[UIToolbar alloc] initWithFrame:CGRectMake(0, [UIScreen mainScreen].bounds.size.height-20-44-49, 320, 49)];
    bottomView2.backgroundColor = [UIColor blackColor];
    bottomView2.tintColor = [UIColor grayColor];
//新增一個輸入textview   
    realCommentTextView = [[UITextView alloc] initWithFrame:CGRectMake(8, 10, 250, 30)];
    realCommentTextView.delegate = self;
    realCommentTextView.backgroundColor = [UIColor whiteColor];
    realCommentTextView.clipsToBounds = YES;
    [realCommentTextView.layer setCornerRadius:5];
    [bottomView2 addSubview:realCommentTextView];
    [realCommentTextView.layer setBorderWidth: 1.0];
    [realCommentTextView.layer setBorderColor: [[UIColor grayColor] CGColor]];
    realCommentTextView.font = [UIFont systemFontOfSize:16];
//新增一個輸入button
    UIButton *commentButton2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    commentButton2.frame = CGRectMake(265, 10, 45, 30);
    [commentButton2 setTitle:NSLocalizedString(@"Send", nil) forState:UIControlStateNormal];
    [bottomView2 addSubview: commentButton2];
    [commentButton2 addTarget:self action:@selector(addCommentButPressed:) forControlEvents:UIControlEventTouchUpInside];
step5.
讓點下後出現bottomView2
    commentTextView.inputAccessoryView = bottomView2;
step6.
加上UITextViewDelegate當輸入很多的時候高會改變並且開起scrolls
#pragma mark - UITextViewDelegate
- (void)textViewDidChange:(UITextView *)textView
{
    if(textView.contentSize.height > 50)
    {
        textView.superview.frame = CGRectMake(0, 0, 320, 98);
        textView.frame = CGRectMake(5, 14.5, 250, 60);
        [textView scrollsToTop];
    }
}














 
 
 
 
