ios开发点击文本（TextField）输入的时候向上推以及输入之后恢复的动画

最新推荐文章于 2018-06-16 11:49:06 发布

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最新推荐文章于 2018-06-16 11:49:06 发布

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文章标签：移动开发

本文介绍如何通过UITextFieldDelegate实现键盘显示时的动画效果，并管理键盘的显示与隐藏。包括UITextField的代理方法设置、键盘显示与隐藏的通知处理及相应动画实现。

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1.添加委托UITextFieldDelegate

-(BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    return YES;
}  //隐藏键盘

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    [self animateTextField: textField up: YES];
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
    [self animateTextField: textField up: NO];
}

- (void) animateTextField: (UITextField*) textField up: (BOOL) up {
    const int movementDistance = 60; // tweak as needed
    const float movementDuration = 0.3f; // tweak as needed
    
    int movement = (up ? -movementDistance : movementDistance);
    
    [UIView beginAnimations: @"anim" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];
    self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    [UIView commitAnimations];
}

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardWillHide:) name:UIKeyboardWillHideNotification object:nil];


#pragma mark - 键盘处理
#pragma mark 键盘即将显示

- (void)keyBoardWillShow:(NSNotification *)note{
    
    CGRect rect = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat ty = - rect.size.height;
    [UIView animateWithDuration:[note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue] animations:^{
        self.view.transform = CGAffineTransformMakeTranslation(0, ty + kNavigationBarHeight);
    }];
    
}

#pragma mark 键盘即将退出

- (void)keyBoardWillHide:(NSNotification *)note{
    
    [UIView animateWithDuration:[note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue] animations:^{
        self.view.transform = CGAffineTransformIdentity;
    }];
}