[英]iOS “Unable to simultaneously satisfy constraints”
我将使用以下表示法来解释已入侵的视图:
在iPad-Air2模拟器上运行时,我得到以下输出:
2016-11-03 08:09:07.700117 MyApp[16645:6976134] [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:0x60000009d600 h=--& v=--& QuizButtons:0x7fcb8e521830.width == 717 (active)>",
"<NSLayoutConstraint:0x608000281fe0 H:|-(0)-[ImgWhiteBar:0x7fcb8e525020] (active, names: '|':ViewTestVC:0x7fcb8e639b30 )>",
"<NSLayoutConstraint:0x6080002820d0 H:[ImgWhiteBar:0x7fcb8e525020]-(0)-| (active, names: '|':ViewTestVC:0x7fcb8e639b30 )>",
"<NSLayoutConstraint:0x608000282210 ImgWhiteBar:0x7fcb8e525020.width == 1.07143*QuizButtons:0x7fcb8e521830.width (active)>",
"<NSLayoutConstraint:0x60000009b9e0 'UIView-Encapsulated-Layout-Width' ViewTestVC:0x7fcb8e639b30.width == 768 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x6080002820d0 H:[ImgWhiteBar:0x7fcb8e525020]-(0)-| (active, names: '|':ViewTestVC:0x7fcb8e639b30 )>
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.
我对记录的约束的解释是:
<h=--& v=--&>
,宽度= 717 也许更简单
问题:
在这里将不胜感激!
编辑
这是三个约束:
冲突约束的列表包括h=--& v=--&
,这是默认的非自动布局形式。
我试图使用自动布局获取初始大小和位置,然后尝试通过设置translatesAutoresizingMaskIntoConstraints = YES来关闭自动布局。 我在Apple开发人员论坛上得到了一个答案,说在这种情况下,我需要删除视图的所有约束,可能是通过从超级视图中删除并添加回来。
小费
在研究此错误时,我发现了一种使约束冲突日志更易于理解的方法。 问题是视图显示为匿名,仅指定类而不指定名称。
为了使您的视图可识别 ,请打开您的.m
文件之一,并为要标识的每个视图添加一个新类,如下所示:
@interface ImgWhiteBar: UIImageView
@end
@implementation ImgWhiteBar
@end
@interface Spacer1: UIView
@end
@implementation Spacer1
@end
之后,在InterfaceBuilder中,选择每个视图,然后在右侧的“ Identity Inspector”中,将通用类(UIVIew,UIImageView等)修改为您刚创建的类之一。
现在再次运行,然后运行Abracadabra-所有视图现在都通过其自定义类进行标识,从而使您能够了解那里发生的情况。
享受有趣的调试约束!
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