Question

我遇到了一个UIView的问题，我添加到屏幕底部并设置动画以填充大部分屏幕（如果按下按钮）。视图将上下动画并按预期旋转。如果我尝试在横向中制作动画，它会中断并给出错误消息：

*** Assertion failure in -[UIScrollView _edgeExpressionInContainer:vertical:max:], /SourceCache/UIKit_Sim/UIKit-2380.17/NSLayoutConstraint_UIKitAdditions.m:2174
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Autolayout doesn't support crossing rotational bounds transforms with edge layout constraints, such as right, left, top, bottom. The offending view is: <UIView: 0x9199340; frame = (20 0; 748 1024); transform = [0, -1, 1, 0, 0, 0]; autoresize = RM+BM; layer = <CALayer: 0x91993d0>>'

违规观点是self.view。

我如何创建UIView：

[self.myContentView addSubview:subBar.filterListView];

[self.myContentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[filterListView]|"
                                                                           options:0
                                                                           metrics:nil
                                                                             views:@{@"filterListView": subBar.filterListView}]];

subBar.filterListView.bottomConstraint = [NSLayoutConstraint constraintWithItem:subBar.filterListView
                                                                      attribute:NSLayoutAttributeBottom
                                                                      relatedBy:NSLayoutRelationEqual
                                                                         toItem:self.mapView
                                                                      attribute:NSLayoutAttributeBottom
                                                                     multiplier:1
                                                                       constant:0];

subBar.filterListView.topConstraint = [NSLayoutConstraint constraintWithItem:subBar.filterListView
                                                                   attribute:NSLayoutAttributeTop
                                                                   relatedBy:NSLayoutRelationEqual
                                                                      toItem:self.mapView
                                                                   attribute:NSLayoutAttributeBottom
                                                                  multiplier:1
                                                                    constant:0];

[self.myContentView addConstraint:subBar.filterListView.bottomConstraint];
[self.myContentView addConstraint:subBar.filterListView.topConstraint];

self.myContentView是一个占据整个self.view的UIView：

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[contentView]|"
                                                                  options:0
                                                                  metrics:nil
                                                                    views:NSDictionaryOfVariableBindings(contentView)]];

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[contentView]|"
                                                                         options:0
                                                                         metrics:nil
                                                                           views:NSDictionaryOfVariableBindings(contentView)]];

要为subBar.filterListView设置动画，我会移除顶部和底部约束，重新分配它们，添加它们并设置动画：

[self.myContentView removeConstraint:view.topConstraint];
[self.myContentView removeConstraint:view.bottomConstraint];

view.topConstraint = [NSLayoutConstraint constraintWithItem:view
                                                  attribute:NSLayoutAttributeTop
                                                  relatedBy:NSLayoutRelationEqual
                                                     toItem:self.topToolBar
                                                  attribute:NSLayoutAttributeBottom
                                                 multiplier:1
                                                   constant:0];

view.bottomConstraint.constant -= SUB_BAR_SIZE.height;

[self.myContentView addConstraint:view.topConstraint];
[self.myContentView addConstraint:view.bottomConstraint];

[self.myContentView setNeedsUpdateConstraints];

[UIView animateWithDuration:.25 animations:^{
    [self.myContentView layoutIfNeeded];
}];

代码在旋转时是否与顶部和底部混淆了？是否认为肖像顶部是景观的左侧？

Answer 1

好的，我找到了解决方案。它没有解决上述问题，而是找到另一种方法来解决它。

我改为将约束改为Visual Format Language（VFL）方法：

subBar.filterListView.verticalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[filtersSubBar][filterListView(0)]" options:0
                                                                                    metrics:nil
                                                                                      views:@{@"filterListView": subBar.filterListView, @"filtersSubBar" : subBar.filtersSubBar}];

我认为问题是使用导致问题的NSLayoutAttributeTop，NSLayoutAttributeRight等属性。

Autolayout无法处理轮换并尝试使用NSLayoutAttributeTop时应将其更改为NSLayoutAttributeRight以表达新方向。我想我们可以手动更改约束。

似乎VFL以不同的方式处理它并且不使用属性？

这感觉好像它只是一个bug或只是iOS的缺点。

Answer 2

对于从谷歌来到这里的任何人：我在自定义PushSegue中调用presentView控制器时遇到此异常：

@implementation PushSegue
- (void) perform
{
    UIViewController* fromController = (UIViewController*) self.sourceViewController;
    UIViewController* toController = (UIViewController*) self.destinationViewController;

    CATransition* transition = [CATransition animation];

    BOOL iPad = [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad;

    transition.duration = iPad ? 0.5 : 0.3;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionPush;

    switch ([UIApplication sharedApplication].statusBarOrientation)
    {
        case UIInterfaceOrientationPortraitUpsideDown:
            transition.subtype = kCATransitionFromLeft;
            break;

        case UIInterfaceOrientationLandscapeLeft:
            transition.subtype = kCATransitionFromBottom;
            break;

        case UIInterfaceOrientationLandscapeRight:
            transition.subtype = kCATransitionFromTop;
            break;

        default:
            transition.subtype = kCATransitionFromRight;
            break;
    }

    [fromController.view.window.layer addAnimation:transition forKey:nil];

    [fromController presentViewController:toController animated:NO completion:nil];
}
@end

原因是我的代码中出现了一些误解：

[self.view setTranslatesAutoresizingMaskIntoConstraints:NO];

（这是我的第一个ios应用程序）你不应该执行这样的调用，所以我删除它，现在一切正常

Answer 3

你是对的，自动布局不适用于影响UI对象的对齐矩形的动画变换。

自动布局，屏幕旋转和UIView动画

3 个答案: