显示没有动画的键盘

Question

看着,UIKeyboardAnimationDurationUserInfoKey但我无法找到任何地方如何将其设置为自定义值.

Answer 1

UIKeyboardAnimationDurationUserInfoKey 是保存动画持续时间的字典键的const字符串标识符,因此无法轻松更改它.

使键盘在没有动画的情况下显示的一种方法是观察键盘通知并在即将出现时禁用动画,然后重新启用它们.当然,这也会禁用任何其他动画.

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

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(didShowKeyboard:) 
                                             name:UIKeyboardDidShowNotification 
                                           object:nil];

- (void)willShowKeyboard:(NSNotification *)notification {
    [UIView setAnimationsEnabled:NO];
}

- (void)didShowKeyboard:(NSNotification *)notification {
    [UIView setAnimationsEnabled:YES];
}

然后是相同的UIKeyboardWillHideNotification/UIKeyboardDidHideNotification通知.

Answer 2

iOS8上的兼容:

添加适当的委托方法:

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    [UIView setAnimationsEnabled:NO];
}

要么

- (void)textViewDidBeginEditing:(UITextView *)textView {
    [UIView setAnimationsEnabled:NO];
}

添加键盘通知:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didShowKeyboard:) name:UIKeyboardDidShowNotification object:nil];

方法:

- (void)didShowKeyboard:(NSNotification *)notification {
    [UIView setAnimationsEnabled:YES];
}

Answer 3

尝试

[UIView performWithoutAnimation:^{
    [textField becomeFirstResponder];
}];

Answer 4

我发现最好的解决方案是使用UIView.setAnimationsEnabled(_ enabled: Bool).

斯威夫特3

UIView.setAnimationsEnabled(false)
textField.becomeFirstResponder()
// or textField.resignFirstResponder() if you want to dismiss the keyboard
UIView.setAnimationsEnabled(true)