添加像典型的聊天应用程序的textfield和发送按钮

Question

我正在努力与似乎应该是简单的事情，但结果不是。我想添加一个UITextField并将发送按钮固定到我的标签栏上方的屏幕底部，并在我的'UITableview'下方。我尝试了一个页脚，但它只是增加了最后一行的底部。

当键盘出现时，我需要它向上移动。

Answer 1

您可以在自定义UIViewController中插入tableView，并在底部添加一个带有发送UITextField的子视图。然后，按照您的意愿按照关于键盘演示的通知和更改tableView并发送UITextField帧。类似的东西：

- (void)viewWillAppear:(BOOL)animated 
{ 
    [super viewWillAppear:(BOOL)animated]; 
    [[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(keyboardWillAppear:) 
              name:UIKeyboardWillShowNotification 
              object:nil]; 
    [[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(keyboardWillDisappear:) 
              name:UIKeyboardWillHideNotification 
              object:nil]; 
} 

- (void)viewWillDisappear:(BOOL)animated 
{ 
    [super viewWillDisappear:(BOOL)animated]; 
    [[NSNotificationCenter defaultCenter] removeObserver:self]; 
} 

#pragma mark - Keyboard appearance/disappearance handling 

- (void)keyboardWillAppear:(NSNotification *)notification 
{ 
    NSDictionary *userInfo = [notification userInfo]; 
    CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size; 

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height, 0.0); 
    [self.tableView setContentInset:contentInsets]; 
    [self.tableView setScrollIndicatorInsets:contentInsets]; 

    CGRect messageFrame = self.messageTextView.frame; 
    messageFrame.origin.y -= keyboardSize.height; 
    [self.messageTextView setFrame:messageFrame]; 
} 

- (void)keyboardWillDisappear:(NSNotification *)notification 
{ 
    NSDictionary *userInfo = [notification userInfo]; 
    CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size; 

    [UIView beginAnimations:nil context:nil]; 
    [UIView setAnimationDuration:0.25]; 
    [self.tableView setContentInset:UIEdgeInsetsZero]; 
    [UIView commitAnimations]; 
    [self.tableView setScrollIndicatorInsets:UIEdgeInsetsZero]; 

    CGRect messageFrame = self.messageTextView.frame; 
    messageFrame.origin.y += keyboardSize.height; 
    [self.messageTextView setFrame:messageFrame]; 
} 

Answer 2

斯威夫特：

var commentField:UITableViewCell! 


override func viewDidLoad() { 
    super.viewDidLoad() 

    NSNotificationCenter.defaultCenter().addObserver(self, selector:"keyboardWillAppear:", name: UIKeyboardWillShowNotification, object: nil) 
    NSNotificationCenter.defaultCenter().addObserver(self, selector:"keyboardWillDisappear:", name: UIKeyboardWillHideNotification, object: nil) 
} 

override func viewWillDisappear(animated: Bool) { 
    super.viewWillDisappear(true) 
    NSNotificationCenter.defaultCenter().removeObserver(self) 
} 

func keyboardWillAppear(notification: NSNotification){ 

    var userInfo:NSDictionary = notification.userInfo! 
    var keyboardSize:CGSize = userInfo.objectForKey(UIKeyboardFrameBeginUserInfoKey)!.CGRectValue().size 

    var contentInsets:UIEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0) 

    self.tableView.contentInset = contentInsets 
    self.tableView.scrollIndicatorInsets = contentInsets 

    var messageFrame:CGRect = self.commentField.frame 
    messageFrame.origin.y -= keyboardSize.height 
    self.commentField.frame = messageFrame 

} 

func keyboardWillDisappear(notification: NSNotification){ 
    var userInfo:NSDictionary = notification.userInfo! 
    var keyboardSize:CGSize = userInfo.objectForKey(UIKeyboardFrameBeginUserInfoKey)!.CGRectValue().size 

    UIView.beginAnimations(nil, context: nil) 
    UIView.setAnimationDuration(0.25) 
    self.tableView.contentInset = UIEdgeInsetsZero 
    UIView.commitAnimations() 

    self.tableView.scrollIndicatorInsets = UIEdgeInsetsZero 

    var messageFrame:CGRect = self.commentField.frame 
    messageFrame.origin.y += keyboardSize.height 
    self.commentField.frame = messageFrame 
}