ios - CollisionBehaviour 不适用于自动布局

Question

我正在尝试实现两个视图之间的冲突。

firstView是带有文本字段的视图。如果某些文本字段成为 firstRecognizer 和键盘框架重叠firstView。它向上移动，如果firstView与 碰撞secondView，它也应该向上推。但这不会发生。而是firstView向上移动直到碰撞，secondView然后放回旧位置。

这里的代码，我使用：

- (void) keyboardChangeValueWithFrame:(CGRect)keyboardFrame isOpening:(BOOL)isOpening isClosing:(BOOL)isClosing {
    CGFloat animTime = .3f;
    if (isOpening && !isClosing) {
        CGRect authFillerViewFrame = self.regFillerView.frame;
        CGFloat rectDif = keyboardFrame.origin.y - authFillerViewFrame.origin.y - authFillerViewFrame.size.height;
        if ([_animator.behaviors containsObject:_collision]) {
            [_animator removeBehavior:_collision];
        }
        if (rectDif < 0) {
            [self.view layoutIfNeeded];
            self.regFillerViewHorizCenterConst.constant = rectDif;
            [self.logoView layoutIfNeeded];
            [UIView animateWithDuration:animTime animations:^{
                _collision = [[UICollisionBehavior alloc] initWithItems:@[self.regFillerView, self.logoView]];
                _collision.translatesReferenceBoundsIntoBoundary = NO;
                _collision.collisionDelegate = self;
                _collision.collisionMode = UICollisionBehaviorModeItems;
                [_animator addBehavior:_collision];
                _collision.action = ^{

                };
                [self.view layoutIfNeeded];
            } completion:^(BOOL finished) {
                if (finished) {
                    //
                }
            }];
        }
    } else if (!isOpening && isClosing) {
        [self.view layoutIfNeeded];
        self.regFillerViewHorizCenterConst.constant = 0.f;
        [UIView animateWithDuration:animTime animations:^{
            [self.view layoutIfNeeded];
        } completion:^(BOOL finished) {
            //
        }];
    }
}

有人可以告诉我的错误吗？或者，可能有人知道更好的解决方案？

Answer 1

我找到了解决方案。我的错误是在调用layoutIfNeeded. 现在我layoutIfNeeded在添加碰撞行为之前调用它并且效果很好。

[UIView animateWithDuration:animTime animations:^{
                _collision = [[UICollisionBehavior alloc] initWithItems:@[self.regFillerView, self.logoView]];
                [self.view layoutIfNeeded];
                _collision.translatesReferenceBoundsIntoBoundary = NO;
                _collision.collisionDelegate = self;
                _collision.collisionMode = UICollisionBehaviorModeItems;
                [_animator addBehavior:_collision];
                _collision.action = ^{

                };
            } completion:^(BOOL finished) {
                if (finished) {
                    //
                }
            }];