无法同时满足约束 - Swift

Question

无法同时满足约束 - Swift

摘要： 我刚刚完成自动布局，当我运行它时，它全部被挤在一起。然后我查看命令提示符，它显示上面的错误。我尝试用谷歌搜索它，但它只显示了 Obj-C 的解决方案，而我正在 Swift 中进行。我该如何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.

Run Code Online (Sandbox Code Playgroud)

我的约束图片 https://www.dropbox.com/s/1l3ys9k7bdr8qrk/Screenshot%202014-10-20%2021.08.47.png?dl=0 我的 iPhone 4 预览图片 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

如果大家有疑问或需要澄清，请在下面评论

Answer 1

aks*_*gde 6

仅通过查看您发布的错误来跟踪哪个是坏约束会有点困难。但我可以给出一般规则或在使用自动布局或一般约束时要记住的事情，

更喜欢在 XIB/Storyboards 中设置约束。当您设置它们时，它会告诉您到底哪里出了问题。除非有特殊情况，否则您几乎可以在界面生成器中执行所有操作。
始终相对于其周围的视图设置约束，尽量不要将所有内容都修复到超级视图
尽可能使用宽高比限制。
尝试使用视图的内在约束大小并避免设置固定的宽度/高度。
请记住，当您设置太多限制时，您总是会陷入所面临的错误。因此，始终要考虑约束是否“足以”在运行时找出其框架。不多或少，但够用即可。
利用不等式约束，它们非常有帮助。另外，不要忘记您有拥抱优先级和抗压优先级。

在您的错误中，我看到很多具有固定大小的约束，当您对这些视图有间距约束时，它们会产生干扰。因此，从第一个开始，保留我提到的要点并删除不需要的约束。

参考，

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