Question

要点： 我刚刚完成了自动布局，当我运行它时，它们全部被碾压在一起。然后我查看命令提示符，它说上面的错误。我试过谷歌搜索它，但它只显示Obj-C的解决方案，我在Swift中做它。我怎样才能解决这个自动布局问题？

错误：

2014-10-20 00:07:41.102 Fraction Calculator[74247:6698760] 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) 
(
    "<NSLayoutConstraint:0x7c440f10 V:[UIButton:0x7c440db0'Divide It!'(30)]>",
    "<NSLayoutConstraint:0x7af7bdb0 V:[UIImageView:0x7af7bae0(8)]>",
    "<NSLayoutConstraint:0x7ae928b0 V:[UITextField:0x7ae952d0(30)]>",
    "<NSLayoutConstraint:0x7ae97110 V:[UITextField:0x7ae96f70(30)]>",
    "<NSLayoutConstraint:0x7ae97eb0 V:[UILabel:0x7ae97d70'Enter Your Fraction To Be...'(48)]>",
    "<NSLayoutConstraint:0x7ae99cd0 V:[_UILayoutGuide:0x7ae990c0]-(0)-[UILabel:0x7ae97d70'Enter Your Fraction To Be...']>",
    "<NSLayoutConstraint:0x7ae9a000 V:[UILabel:0x7ae97d70'Enter Your Fraction To Be...']-(41)-[UITextField:0x7ae96f70]>",
    "<NSLayoutConstraint:0x7ae9a090 V:[UITextField:0x7ae96f70]-(14)-[UIImageView:0x7af7bae0]>",
    "<NSLayoutConstraint:0x7ae9a150 V:[UIImageView:0x7af7bae0]-(13)-[UITextField:0x7ae952d0]>",
    "<NSLayoutConstraint:0x7ae9a270 V:[UITextField:0x7ae952d0]-(59)-[UIButton:0x7c440db0'Divide It!']>",
    "<NSLayoutConstraint:0x7ae9a2a0 V:[UIButton:0x7c440db0'Divide It!']-(50)-[UILabel:0x7ae98df0]>",
    "<NSLayoutConstraint:0x7ae9a300 V:[UILabel:0x7ae98df0]-(166)-[_UILayoutGuide:0x7ae99680]>",
    "<_UILayoutSupportConstraint:0x7c441e80 V:[_UILayoutGuide:0x7ae990c0(20)]>",
    "<_UILayoutSupportConstraint:0x7c441770 V:|-(0)-[_UILayoutGuide:0x7ae990c0]   (Names: '|':UIView:0x7af7abc0 )>",
    "<_UILayoutSupportConstraint:0x7c443610 V:[_UILayoutGuide:0x7ae99680(0)]>",
    "<_UILayoutSupportConstraint:0x7c4429d0 _UILayoutGuide:0x7ae99680.bottom == UIView:0x7af7abc0.bottom>",
    "<NSLayoutConstraint:0x7c44acf0 'UIView-Encapsulated-Layout-Height' V:[UIView:0x7af7abc0(480)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7ae97eb0 V:[UILabel:0x7ae97d70'Enter Your Fraction To Be...'(48)]>

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.

我的约束形象 https://www.dropbox.com/s/1l3ys9k7bdr8qrk/Screenshot%202014-10-20%2021.08.47.png?dl=0 我的iPhone 4预览图像 https://www.dropbox.com/s/7uoulzppalex2r8/Screenshot%202014-10-20%2021.09.48.png?dl=0 模拟器中iPhone 4的图像 https://www.dropbox.com/s/c1qedgoytcnetri/iOS%20Simulator%20Screen%20Shot%20Oct%2020%2C%202014%2C%209.10.03%20PM.png?dl=0

如果您有疑问或需要澄清，请在下方发表评论

Answer 1

通过查看您发布的错误来跟踪哪个是坏约束会有点困难。但是，在处理autolayout或一般约束时，我可以给出一般规则或事项，

首选在XIB / Storyboards中设置约束。当你设置它时，它会告诉你哪里出错了。除非是特殊情况，否则几乎可以在界面构建器中执行所有操作。
始终相对于周围的视图设置约束，尝试不将所有内容修复为超级视图
尽可能使用宽高比限制。
尝试使用视图的内在约束大小，避免设置固定的宽度/高度。
请记住，当您设置太多限制时，您将始终遇到您所面临的错误。所以总是认为约束“足够”在运行时间中找出它的框架。不多或少，但足够。
利用不等的约束，它们非常有用。另外，不要忘记你拥有优先权和抗压优先权。

在你的错误中，我看到很多具有固定大小的约束，当你对这些视图有间距约束时它们会干扰。所以从第一个开始，保留我提到的点并删除你不需要的约束。

参考，

Answer 2

我很难搞清楚导致此错误的约束条件。这是一种更简单的方法。

我正在使用Xcode 6.1.1

＆＃34; Command + A＆＃34;选择所有UILabels，UIImages等点击编辑 - ＆gt; Pin＆gt; （选择......）到Superview 再次单击编辑器 - ＆gt;解决自动布局问题 - ＆gt;添加缺失约束或重置为建议的约束。这取决于你的情况。

无法同时满足约束 - Swift

2 个答案: