【发布时间】：2017-08-03 03:36:17
【问题描述】：
我在调试器中收到Unable to simultaneously satisfy constraints. 错误。我知道这种类型的问题已经被问过很多次了，而且我知道如何跟踪约束以查看问题所在 - 但这个问题对我来说毫无意义。我正在使用UITableViewAutomaticDimension 功能来自动调整单元格的大小。以下是我的限制条件。为了简化图像，图像上的每个对象都有一个指定的高度，除了 postTextView，它具有灵活的高度，以便它可以扩展不同数量的文本。我希望其他所有东西都有一个特定的高度。
一旦约束被打破，它声明它将在控制台中尝试，屏幕上的布局是正确的，一切都按照我的预期运行。
这是我在运行应用程序时遇到的错误：
2017-08-02 23:29:29.932838-0400 StudyHub[35782:3472431] [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.
(
"<NSLayoutConstraint:0x60400048e9c0 UIImageView:0x7fe16cd55110.height == 55 (active)>",
"<NSLayoutConstraint:0x60400048b680 UIButton:0x7fe16cd5a1d0'0'.height == 25 (active)>",
"<NSLayoutConstraint:0x60400048ee70 UIStackView:0x7fe16cd5cf60.height == 308 (active)>",
"<NSLayoutConstraint:0x60400048f550 V:|-(8)-[UIImageView:0x7fe16cd55110] (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048f640 V:[UIImageView:0x7fe16cd55110]-(8)-[UITextView:0x7fe16d8ff000'This is a test of the pos...'] (active)>",
"<NSLayoutConstraint:0x60400048f780 V:[UITextView:0x7fe16d8ff000'This is a test of the pos...']-(8)-[UIStackView:0x7fe16cd5cf60] (active)>",
"<NSLayoutConstraint:0x60400048f8c0 V:[UIStackView:0x7fe16cd5cf60]-(8)-[UIButton:0x7fe16cd5a1d0'0'] (active)>",
"<NSLayoutConstraint:0x60400048f910 V:[UIButton:0x7fe16cd5a1d0'0']-(8)-| (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048fb90 V:|-(8)-[UIView:0x7fe16cd543b0] (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x60400048fc30 V:[UIView:0x7fe16cd543b0]-(8)-| (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x600000499460 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7fe16cd53650.height == 50 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60400048ee70 UIStackView:0x7fe16cd5cf60.height == 308 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-08-02 23:29:29.962013-0400 StudyHub[35782:3472431] [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.
(
"<NSLayoutConstraint:0x60400048e9c0 UIImageView:0x7fe16cd55110.height == 55 (active)>",
"<NSLayoutConstraint:0x60400048b680 UIButton:0x7fe16cd5a1d0'0'.height == 25 (active)>",
"<NSLayoutConstraint:0x60400048f550 V:|-(8)-[UIImageView:0x7fe16cd55110] (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048f640 V:[UIImageView:0x7fe16cd55110]-(8)-[UITextView:0x7fe16d8ff000'This is a test of the pos...'] (active)>",
"<NSLayoutConstraint:0x60400048f780 V:[UITextView:0x7fe16d8ff000'This is a test of the pos...']-(8)-[UIStackView:0x7fe16cd5cf60] (active)>",
"<NSLayoutConstraint:0x60400048f8c0 V:[UIStackView:0x7fe16cd5cf60]-(8)-[UIButton:0x7fe16cd5a1d0'0'] (active)>",
"<NSLayoutConstraint:0x60400048f910 V:[UIButton:0x7fe16cd5a1d0'0']-(8)-| (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048fb90 V:|-(8)-[UIView:0x7fe16cd543b0] (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x60400048fc30 V:[UIView:0x7fe16cd543b0]-(8)-| (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x6000004990f0 'UISV-canvas-connection' UIStackView:0x7fe16cd5cf60.top == UIStackView:0x7fe16cd5d9c0.top (active)>",
"<NSLayoutConstraint:0x600000498fb0 'UISV-canvas-connection' V:[UIStackView:0x7fe16cd5e110]-(0)-| (active, names: '|':UIStackView:0x7fe16cd5cf60 )>",
"<NSLayoutConstraint:0x600000499190 'UISV-fill-equally' UIStackView:0x7fe16cd5e110.height == UIStackView:0x7fe16cd5d9c0.height (active)>",
"<NSLayoutConstraint:0x6000004991e0 'UISV-spacing' V:[UIStackView:0x7fe16cd5d9c0]-(8)-[UIStackView:0x7fe16cd5e110] (active)>",
"<NSLayoutConstraint:0x600000499460 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7fe16cd53650.height == 50 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x6000004991e0 'UISV-spacing' V:[UIStackView:0x7fe16cd5d9c0]-(8)-[UIStackView:0x7fe16cd5e110] (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-08-02 23:29:29.963167-0400 StudyHub[35782:3472431] [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.
(
"<NSLayoutConstraint:0x60400048e9c0 UIImageView:0x7fe16cd55110.height == 55 (active)>",
"<NSLayoutConstraint:0x60400048b680 UIButton:0x7fe16cd5a1d0'0'.height == 25 (active)>",
"<NSLayoutConstraint:0x60400048f550 V:|-(8)-[UIImageView:0x7fe16cd55110] (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048f640 V:[UIImageView:0x7fe16cd55110]-(8)-[UITextView:0x7fe16d8ff000'This is a test of the pos...'] (active)>",
"<NSLayoutConstraint:0x60400048f780 V:[UITextView:0x7fe16d8ff000'This is a test of the pos...']-(8)-[UIStackView:0x7fe16cd5cf60] (active)>",
"<NSLayoutConstraint:0x60400048f8c0 V:[UIStackView:0x7fe16cd5cf60]-(8)-[UIButton:0x7fe16cd5a1d0'0'] (active)>",
"<NSLayoutConstraint:0x60400048f910 V:[UIButton:0x7fe16cd5a1d0'0']-(8)-| (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048fb90 V:|-(8)-[UIView:0x7fe16cd543b0] (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x60400048fc30 V:[UIView:0x7fe16cd543b0]-(8)-| (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x600000499460 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7fe16cd53650.height == 50 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60400048e9c0 UIImageView:0x7fe16cd55110.height == 55 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-08-02 23:29:29.963961-0400 StudyHub[35782:3472431] [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.
(
"<NSLayoutConstraint:0x60400048b680 UIButton:0x7fe16cd5a1d0'0'.height == 25 (active)>",
"<NSLayoutConstraint:0x60400048f550 V:|-(8)-[UIImageView:0x7fe16cd55110] (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048f640 V:[UIImageView:0x7fe16cd55110]-(8)-[UITextView:0x7fe16d8ff000'This is a test of the pos...'] (active)>",
"<NSLayoutConstraint:0x60400048f780 V:[UITextView:0x7fe16d8ff000'This is a test of the pos...']-(8)-[UIStackView:0x7fe16cd5cf60] (active)>",
"<NSLayoutConstraint:0x60400048f8c0 V:[UIStackView:0x7fe16cd5cf60]-(8)-[UIButton:0x7fe16cd5a1d0'0'] (active)>",
"<NSLayoutConstraint:0x60400048f910 V:[UIButton:0x7fe16cd5a1d0'0']-(8)-| (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048fb90 V:|-(8)-[UIView:0x7fe16cd543b0] (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x60400048fc30 V:[UIView:0x7fe16cd543b0]-(8)-| (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x600000499460 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7fe16cd53650.height == 50 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60400048b680 UIButton:0x7fe16cd5a1d0'0'.height == 25 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-08-02 23:29:29.964742-0400 StudyHub[35782:3472431] [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.
(
"<NSLayoutConstraint:0x60400048f550 V:|-(8)-[UIImageView:0x7fe16cd55110] (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048f640 V:[UIImageView:0x7fe16cd55110]-(8)-[UITextView:0x7fe16d8ff000'This is a test of the pos...'] (active)>",
"<NSLayoutConstraint:0x60400048f780 V:[UITextView:0x7fe16d8ff000'This is a test of the pos...']-(8)-[UIStackView:0x7fe16cd5cf60] (active)>",
"<NSLayoutConstraint:0x60400048f8c0 V:[UIStackView:0x7fe16cd5cf60]-(8)-[UIButton:0x7fe16cd5a1d0'0'] (active)>",
"<NSLayoutConstraint:0x60400048f910 V:[UIButton:0x7fe16cd5a1d0'0']-(8)-| (active, names: '|':UIView:0x7fe16cd543b0 )>",
"<NSLayoutConstraint:0x60400048fb90 V:|-(8)-[UIView:0x7fe16cd543b0] (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x60400048fc30 V:[UIView:0x7fe16cd543b0]-(8)-| (active, names: '|':UITableViewCellContentView:0x7fe16cd53650 )>",
"<NSLayoutConstraint:0x600000499460 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7fe16cd53650.height == 50 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60400048f640 V:[UIImageView:0x7fe16cd55110]-(8)-[UITextView:0x7fe16d8ff000'This is a test of the pos...'] (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
【问题讨论】：
-
这很复杂，但这里有一个猜测。如果堆栈视图的高度不受限制，它可以改变大小，但中心必须距离底部 38。这意味着到底部的距离会有所不同。然而，到底部的距离也受到下方按钮的间距以及它们与底部的间距的限制。这些限制似乎是固定的。也许尝试删除该中心约束，看看会发生什么。
-
我同意。要使自动行大小调整起作用，您需要从上到下的连续垂直约束链；由于按钮的底部约束和堆栈视图的底部约束，您有两个。这导致了冲突
-
我看到我提供的图形存在一个小问题并对其进行了更新。垂直约束仅在底部中心按钮上，而不在堆栈视图上。我从上到下有连续的垂直约束，除了中心文本视图没有设置垂直高度，因此它是有弹性的。
标签： ios swift xcode uitableview autolayout