Ios 沿键盘设置UIView动画显示动画
我正在使用Ios 沿键盘设置UIView动画显示动画,ios,animation,uikeyboard,Ios,Animation,Uikeyboard,我正在使用UIKeyboardWillShowNotification和UIKeyboardWillHideNotification沿键盘显示动画视图，使用UIKeyboardAnimationDurationUserInfoKey，uikeyboardanimationcurveueinfokey和UIKeyboardFrameEndUserInfoKey 只要元素的起始位置在屏幕底部，一切正常。我的元素（屏幕截图中的输入框）从UITabBarController上方开始，因此，如果我的动画开
UIKeyboardWillShowNotificationUIKeyboardWillHideNotificationUIKeyboardAnimationDurationUserInfoKeyuikeyboardanimationcurveueinfokeyUIKeyboardFrameEndUserInfoKey通常有两种方法可用于在键盘动画设置到位时将视图保持在键盘上方。如您所知，第一种方法是监听
ui键盘willshowNotificationUITextFieldinputAccessoryViewUIKeyboardWillShowNotificationUIToolbaruitabarITextFieldinputAccessoryViewUIToolbar@implementation TSViewController
{
IBOutlet UIToolbar* _toolbar; // parented in your view somewhere
IBOutlet UITextField* _textField; // the customView of a UIBarButtonItem in the toolbar
IBOutlet UIToolbar* _inputAccessoryToolbar; // not parented. just owned by the view controller.
IBOutlet UITextField* _inputAccessoryTextField; // the customView of a UIBarButtonItem in the inputAccessoryToolbar
}
- (void) viewDidLoad
{
[super viewDidLoad];
_textField.delegate = self;
_inputAccessoryTextField.delegate = self;
_textField.inputAccessoryView = _inputAccessoryToolbar;
}
- (void) textFieldDidBeginEditing: (UITextField *) textField
{
if ( textField == _textField )
{
// can't change responder directly during textFieldDidBeginEditing. postpone:
dispatch_async(dispatch_get_main_queue(), ^{
_inputAccessoryTextField.text = textField.text;
[_inputAccessoryTextField becomeFirstResponder];
});
}
}
- (BOOL) textFieldShouldBeginEditing: (UITextField *) textField
{
if ( textField == _textField )
{
// only become first responder if the inputAccessoryTextField isn't the first responder.
return ![_inputAccessoryTextField isFirstResponder];
}
return YES;
}
- (void) textFieldDidEndEditing: (UITextField *) textField
{
if ( textField == _inputAccessoryTextField )
{
_textField.text = textField.text;
}
}
// invoke this when you want to dismiss the keyboard!
- (IBAction) done: (id) sender
{
[_inputAccessoryTextField resignFirstResponder];
}
@end
我能想到最后一种可能性。上述方法的缺点是有两个单独的工具栏/文本字段。理想情况下，您需要的只是其中的一组，并且您希望键盘将它们向上“推”或向下拉。在现实中，动画的速度足够快，我不认为大多数人会注意到上面的方法有两套，但也许你不喜欢 最后一种方法监听键盘的显示/隐藏，并使用
CADisplayLink@implementation TSViewController
{
IBOutlet UITextField* _textField;
IBOutlet UIToolbar* _toolbar;
IBOutlet NSLayoutConstraint* _toolbarBottomDistanceConstraint;
CADisplayLink* _displayLink;
}
- (void) dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver: self];
}
- (void) viewDidLoad
{
[super viewDidLoad];
[self.view addGestureRecognizer: [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector( dismiss:) ]];
_textField.inputAccessoryView = [[UIView alloc] init];
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(keyboardWillShowHide:)
name: UIKeyboardWillShowNotification
object: nil];
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(keyboardWillShowHide:)
name: UIKeyboardWillHideNotification
object: nil];
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(keyboardDidShowHide:)
name: UIKeyboardDidShowNotification
object: nil];
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(keyboardDidShowHide:)
name: UIKeyboardDidHideNotification
object: nil];
}
- (void) keyboardWillShowHide: (NSNotification*) n
{
_displayLink = [CADisplayLink displayLinkWithTarget: self selector: @selector( tick: )];
[_displayLink addToRunLoop: [NSRunLoop currentRunLoop] forMode: NSRunLoopCommonModes];
}
- (void) keyboardDidShowHide: (NSNotification*) n
{
[_displayLink removeFromRunLoop: [NSRunLoop currentRunLoop] forMode: NSRunLoopCommonModes];
}
- (void) tick: (CADisplayLink*) dl
{
CGRect r = [_textField.inputAccessoryView.superview.layer.presentationLayer frame];
r = [self.view convertRect: r fromView: _textField.inputAccessoryView.superview.superview];
CGFloat fromBottom = self.view.bounds.size.height - r.origin.y;
_toolbarBottomDistanceConstraint.constant = fromBottom;
}
- (IBAction) dismiss: (id) sender
{
[self.view endEditing: YES];
}
@end