macOS 10.12自动布局问题

Question

在10.12中有几个巨大的变化,但在我看来最大的是新的自动布局系统(或修改/重写旧的...谁知道).我准备了一个简单的项目来证明这个问题.它与通过按钮折叠拆分视图项目有关.它只发生在10.12.您需要做的就是编译项目并单击按钮.将出现错误:

2016-10-04 15:10:28.284296 test-12 [64932:7425277] [布局]检测到缺失约束.它无法放置,因为没有足够的约束来完全定义大小和原点.添加缺少的约束,或设置translatesAutoresizingMaskIntoConstraints = YES,并为您生成约束.如果此视图在macOS 10.12及更高版本上手动布局,您可以选择不从覆盖中调用[super layout].在DETECTED_MISSING_CONSTRAINTS上设置断点以进行调试.此错误仅记录一次.

设置断点后,我们可以发现有问题的视图是:

(lldb) po $arg1
<NSSplitDividerView: 0x618000161980>

我完全错了还是10.12有明确的问题？如果可能的话,请建议如何防止此类错误.

该项目可以从github下载

再次感谢您的帮助.

I. Nikolov

Answer 1

我有同样的自动布局问题，我找到了适合我的项目的解决方法。添加子视图及其约束后，我将窗口称为“布局”。不幸的是，我在每次“添加”调用后都会这样做，否则系统将再次抛出丑陋的消息。它对我有用，我只是在初始化期间调用它。

  // Left Split View
  [self.scrollviewMain setTranslatesAutoresizingMaskIntoConstraints:NO];
  [self.viewMainLeft addSubview:self.scrollviewMain];
  [self.viewMainLeft addConstraint:[NSLayoutConstraint constraintWithItem:self.viewMainLeft attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.scrollviewMain attribute:NSLayoutAttributeBottom multiplier:1.0 constant:l_floatConstant]];
  [self.viewMainLeft addConstraint:[NSLayoutConstraint constraintWithItem:self.viewMainLeft attribute:NSLayoutAttributeTop    relatedBy:NSLayoutRelationEqual toItem:self.scrollviewMain attribute:NSLayoutAttributeTop    multiplier:1.0 constant:-l_floatConstant]];
  [self.viewMainLeft addConstraint:[NSLayoutConstraint constraintWithItem:self.viewMainLeft attribute:NSLayoutAttributeLeft   relatedBy:NSLayoutRelationEqual toItem:self.scrollviewMain attribute:NSLayoutAttributeLeft   multiplier:1.0 constant:-l_floatConstant]];
  [self.viewMainLeft addConstraint:[NSLayoutConstraint constraintWithItem:self.viewMainLeft attribute:NSLayoutAttributeRight  relatedBy:NSLayoutRelationEqual toItem:self.scrollviewMain attribute:NSLayoutAttributeRight  multiplier:1.0 constant:l_floatConstant]];
  [self.windowMain layoutIfNeeded];
  // Right Split View
  [self.scrollviewDetails setTranslatesAutoresizingMaskIntoConstraints:NO];
  [self.viewMainRight addSubview:self.scrollviewDetails];
  [self.viewMainRight addConstraint:[NSLayoutConstraint constraintWithItem:self.viewMainRight attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.scrollviewDetails attribute:NSLayoutAttributeBottom multiplier:1.0 constant:l_floatConstant]];
  [self.viewMainRight addConstraint:[NSLayoutConstraint constraintWithItem:self.viewMainRight attribute:NSLayoutAttributeTop    relatedBy:NSLayoutRelationEqual toItem:self.scrollviewDetails attribute:NSLayoutAttributeTop    multiplier:1.0 constant:-l_floatConstant-1]];
  [self.viewMainRight addConstraint:[NSLayoutConstraint constraintWithItem:self.viewMainRight attribute:NSLayoutAttributeLeft   relatedBy:NSLayoutRelationEqual toItem:self.scrollviewDetails attribute:NSLayoutAttributeLeft   multiplier:1.0 constant:-l_floatConstant]];
  [self.viewMainRight addConstraint:[NSLayoutConstraint constraintWithItem:self.viewMainRight attribute:NSLayoutAttributeRight  relatedBy:NSLayoutRelationEqual toItem:self.scrollviewDetails attribute:NSLayoutAttributeRight  multiplier:1.0 constant:l_floatConstant]];
  [self.windowMain layoutIfNeeded];