UIToolBar + UITextField = Chat

Question

拥有：

@property (weak, nonatomic) IBOutlet UIToolbar *toolBar;

[nc addObserver:self selector:@selector(notificationKeyboard:) name:UIKeyboardWillShowNotification object:nil];
[nc addObserver:self selector:@selector(notificationKeyboard:) name:UIKeyboardWillHideNotification object:nil];

试试这个：

- (void)notificationKeyboard:(NSNotification *)notification {

UIViewAnimationOptions keyboardCurve = [notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
double keyboardDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect keyboardRect = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
keyboardRect = [self.view convertRect:keyboardRect fromView:nil];
CGFloat pointY = CGRectGetMinY(keyboardRect);

void (^animations)(void) = ^{

    CGRect toolBarRect = self.toolBar.frame;
    toolBarRect.origin.y = pointY - CGRectGetHeight(toolBarRect);
    self.toolBar.frame = toolBarRect;

};

[UIView animateWithDuration:keyboardDuration
                      delay:0
                    options:keyboardCurve
                 animations:animations
                 completion:nil];
}

但在我看来没有动画：

一些故事：-在故事情节提要1工具栏与约束空间(左，右，按钮)

Answer 1

如果使用自动布局配置此视图，则无法对视图的框架进行动画化。相反，您需要公开您需要更改的约束(在您的例子中，我猜是bottom )，并更改此约束的值。

Answer 2

我的解决方案：

void (^animations)(void) = ^{

    CGRect toolBarRect = self.toolBar.frame;
    toolBarRect.origin.y = pointY - CGRectGetHeight(toolBarRect);

    for(NSLayoutConstraint *constraint in self.view.constraints) {
        if(constraint.secondAttribute == NSLayoutAttributeBottom && constraint.secondItem == self.toolBar) {
            constraint.constant = CGRectGetHeight(self.view.frame) - pointY;
        }
    }

    self.toolBar.frame = toolBarRect;
    [self.toolBar layoutIfNeeded];

};

谢谢你的帮助