意外的NSAutoresizingMaskLayoutConstraint从笔尖添加UIView到自动布局故事板场景

Question

我在IB中有以下内容，两个视图都有“使用自动布局”和“调整子视图大小”。

我只是尝试将一个Autolayout View实例添加到容器视图中，使其边缘与容器视图的边缘相交。容器视图使用“自动布局”并且高度相同但宽度是两倍。这是代码：

- (IBAction)addSubviewButton:(id)sender
{
  UIView *autolayoutView = [[[NSBundle mainBundle] loadNibNamed:@"AutolayoutView" owner:nil options:nil] objectAtIndex:0];
  [self.containerView addSubview:autolayoutView];

  [self.containerView addConstraint:
   [NSLayoutConstraint constraintWithItem:autolayoutView
                            attribute:NSLayoutAttributeLeading
                            relatedBy:NSLayoutRelationEqual
                               toItem:self.containerView
                            attribute:NSLayoutAttributeLeading
                           multiplier:1
                             constant:0]];
  [self.containerView addConstraint:
   [NSLayoutConstraint constraintWithItem:autolayoutView
                            attribute:NSLayoutAttributeTrailing
                            relatedBy:NSLayoutRelationEqual
                               toItem:self.containerView
                            attribute:NSLayoutAttributeTrailing
                           multiplier:1
                             constant:0]];
  [self.containerView addConstraint:
  [NSLayoutConstraint constraintWithItem:autolayoutView
                           attribute:NSLayoutAttributeTop
                           relatedBy:NSLayoutRelationEqual
                              toItem:self.containerView
                           attribute:NSLayoutAttributeTop
                          multiplier:1.0
                            constant:0.0]];
  [self.containerView addConstraint:
  [NSLayoutConstraint constraintWithItem:autolayoutView
                           attribute:NSLayoutAttributeBottom
                           relatedBy:NSLayoutRelationEqual
                              toItem:self.containerView
                           attribute:NSLayoutAttributeBottom
                          multiplier:1.0 constant:0.0]];
}

发生错误：

Probably at least one of the constraints in the following list is one you don't want...
(
"<NSIBPrototypingLayoutConstraint:0x8c364d0 'IB auto generated at build time for view with fixed frame' H:[UIView:0x8c356f0(275)]>",
"<NSLayoutConstraint:0x8d43d80 H:|-(0)-[AutolayoutView:0x8d47a30]   (Names: '|':UIView:0x8c356f0 )>",
"<NSLayoutConstraint:0x8d09260 AutolayoutView:0x8d47a30.trailing == UIView:0x8c356f0.trailing>",
"<NSAutoresizingMaskLayoutConstraint:0x8d0eca0 h=--& v=--& AutolayoutView:0x8d47a30.midX == + 70>"
)

看起来在将Autolayout View添加为子视图后，会自动在Autolayout View上创建NSAutoresizingMaskLayoutConstraint吗？在didMoveToSuperview中打印Autolayout View的约束时，它尚不存在。怎么解决这个问题？我想尝试在IB中创建对Autolayout View的约束作为占位符在构建时忽略，但IB为Autolayout View禁用了所有自动布局选项。

Answer 1

删除此约束的最简单方法是将视图的translatesAutoresizingMaskIntoConstraints设置为Swift中的false（或Objective-C中的NO）。你可以在没有任何代码的情况下使用它。您可以在界面构建器中使用键路径（附加屏幕）。