ConstraintsMonitor 1.0.0

ConstraintsMonitor 1.0.0

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由 Francisco Depascuali 维护。

ConstraintsMonitor 1.0.0

  • 作者
  • FranDepascuali

ConstraintsMonitor

一个用于理解约束警告的工具，仅作为依赖项添加。

没有 ConstraintsMonitor

[LayoutConstraints] Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don't want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don't expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
	(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSAutoresizingMaskLayoutConstraint:0x600003220d20 h=--& v=--& ConstraintsMonitor_Example.MyView:0x7fcdaff03e10.height == 896   (active)>",
    "<NSLayoutConstraint:0x600003220a50 UIView:0x7fcdaff031e0.height == 200   (active)>",
    "<NSLayoutConstraint:0x600003220410 V:|-(0)-[UIView:0x7fcdaff031e0]   (active, names: '|':ConstraintsMonitor_Example.MyView:0x7fcdaff03e10 )>",
    "<NSLayoutConstraint:0x600003220aa0 V:[UIView:0x7fcdaff031e0]-(0)-[UIView:0x7fcdaff03fc0]   (active)>",
    "<NSLayoutConstraint:0x600003220b90 UIView:0x7fcdaff03fc0.bottom == ConstraintsMonitor_Example.MyView:0x7fcdaff03e10.bottom   (active)>",
    "<NSLayoutConstraint:0x600003220be0 UIView:0x7fcdaff03fc0.height == 0.2*ConstraintsMonitor_Example.MyView:0x7fcdaff03e10.height   (active)>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x600003220a50 UIView:0x7fcdaff031e0.height == 200   (active)>

有 ConstraintsMonitor

[LayoutConstraints] Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don't want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don't expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
	(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "UIViewControllerWrapperView.MyView.height == 896.0 (Did you set translatesAutoresizingMaskIntoConstraints = false?)",
    "MyView.UIView.height == 200.0 ",
    "MyView.UIView.top == UIViewControllerWrapperView.MyView.top (constant: 0.0)",
    "MyView.UIView.top == UIView.bottom (constant: 0.0)",
    "MyView.UIView.bottom == UIViewControllerWrapperView.MyView.bottom (constant: 0.0)",
    "MyView.UIView.height == UIViewControllerWrapperView.MyView.height (multiplier: 0.200)"
)

Will attempt to recover by breaking constraint 
MyView.UIView.height == 200.0 

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.

为什么？

我厌倦了寻找约束问题，并意识到真正的問題所在，因此我创建了这个小工具来打印更漂亮的约束信息。

安装

ConstraintsMonitor可通过CocoaPods获取。要安装它，只需将以下行添加到Podfile中

pod 'ConstraintsMonitor'

用法

仅通过拥有这个库，你将看到更漂亮的约束警告

主要功能

  • 如果提供，请使用约束标识符。
  • 如果视图是 UIView 的子类，请使用视图标识符或类名。
  • 显示父视图，这样更容易找到问题所在的位置。

它是如何工作的？

通过重写有关联的 NSLayoutConstraint 的描述属性，我们有一种更好的方式来查看约束。

作者

您可以在我的博客 https://deep-thought.netlify.com/ 或推特上 @FranDepascuali 找到我。

许可协议

ConstraintsMonitor 在 MIT 许可证下可用。有关更多信息，请参阅 LICENSE 文件。