键盘顶部的工具栏和firstresponder

Question

这是一个非常常见的话题，并且有很多答案。

情况：我有一个全屏（不包括工具栏）UITextView，底部有一个UIToolbar。当 UITextView 获得第一响应者时，我想让工具栏随键盘向上滑动，并添加一个“完成”按钮，该按钮将关闭键盘。

到目前为止：我已经完全正常工作了，基于这个例子。除了当我将 [textViewBecomeFirstResponder]; 放入 viewDidLoad 中时，工具栏不会显示动画。即使 keyboardWillShow 被调用。有人知道吗？

代码：这样您就不必查看示例代码，这就是发生的情况：

在viewDidLoad中：

- (void)viewDidLoad {
    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
   [nc addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
   [nc addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
   [textView becomeFirstResponder];
       [super viewDidLoad];
}

在keyboardWillShow中：

- (void)keyboardWillShow:(NSNotification *)notification {
NSLog(@"keyboard will show");
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationCurve:[[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
    [UIView setAnimationDuration:[[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];

    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone 
                                                                            target:self 
                                                                            action:@selector(keyboardDone)];
    NSMutableArray *toolbarItems = [NSMutableArray arrayWithArray:[toolbar items]];
    [toolbarItems addObject:doneButton];
    [toolbar setItems:toolbarItems];

    CGRect frame = self.view.frame;
    frame.size.height -= [[[notification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey] CGRectValue].size.height;
    self.view.frame = frame;
     [UIView commitAnimations];
 }

Answer 1

尝试将 -becomeFirstResponder 调用移至 -viewWillAppear:animated: 或 -viewDidAppear:animated:。我认为 -viewDidLoad 通常在视图实际添加到视图层次结构之前调用。

Answer 2

将其添加到您的代码中

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {

    return YES;
}

-(BOOL)textViewShouldBeginEditing:(UITextView *)textView{

    UIToolbar* keyboardDoneButtonView   = [[UIToolbar alloc] init];
    keyboardDoneButtonView.barStyle     = UIBarStyleBlack;
    keyboardDoneButtonView.translucent  = YES;
    keyboardDoneButtonView.tintColor    = nil;
    [keyboardDoneButtonView sizeToFit];

    UIBarButtonItem* doneButton    = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleBordered  target:self action:@selector(doneBtnTapped:)];

    // I put the spacers in to push the doneButton to the right side of the picker view
    UIBarButtonItem *spacer1    = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace 
                                                                                target:nil action:nil];

    // I put the spacers in to push the doneButton to the right side of the picker view
    UIBarButtonItem *spacer    = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace 
                                                                               target:nil action:nil];

    [keyboardDoneButtonView setItems:[NSArray arrayWithObjects:spacer, spacer1, doneButton, nil]];

    // Plug the keyboardDoneButtonView into the text field...
    textView.inputAccessoryView = keyboardDoneButtonView;

    return YES;
}

- (void)doneBtnTapped:(id)sender {
     [yourTextView resignFirstResponder];
}

并且一切都完成了......