macos-sierra - macOS 10.12自动布局问题

Question

10.12中有几个巨大的变化，但我认为最大的变化是新的自动版式系统(或修改/重写的旧版式...谁知道)。我准备了一个简单的项目来演示该问题。这与通过按钮折叠拆分 View 项有关。它仅在10.12上发生。您需要做的就是编译项目，然后单击按钮。将出现错误:

2016-10-04 15:10:28.284296 test-12[64932:7425277] [Layout] Detected missing constraints for . It cannot be placed because there are not enough constraints to fully define the size and origin. Add the missing constraints, or set translatesAutoresizingMaskIntoConstraints=YES and constraints will be generated for you. If this view is laid out manually on macOS 10.12 and later, you may choose to not call [super layout] from your override. Set a breakpoint on DETECTED_MISSING_CONSTRAINTS to debug. This error will only be logged once.

设置断点后，我们可以发现问题 View 是:

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

我是完全错误的还是10.12确实存在问题？并请提出建议，如果可能的话，如何防止此类错误。

可以从 github下载该项目

再次感谢您的帮助。

尼科洛夫(I. Nikolov)

Answer 1

我有同样的自动版式问题，并且找到了针对我的项目的解决方法。
在添加带有约束的 subview 之后，我将窗口称为“布局”。不幸的是，我在每次“添加”调用之后都这样做，否则系统将再次抛出难看的消息。它对我有用，我只是在初始化时就称呼它。

  // 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];