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有人可以幫我解決這個問題嗎？我添加了另一個ViewController並將其與原始視圖控制器模塊化地鏈接起來。它最初的工作，但我再次運行它，因爲我在文本中進行了更改，現在它不會編譯。我刪除了所有的約束，並刪除了它所說的沒有正確鏈接的「按鈕」。XCode 7編譯錯誤Swift
2015-10-26 00:48:43.611 XXXX[5790:2031206] 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:0x15ce8dac0 V:|-(20)-[UIInputSetContainerView:0x15ce2e050] (Names: '|':UITextEffectsWindow:0x15ce694a0)>",
"<NSLayoutConstraint:0x15ce8e630 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x15ce2e050] (Names: '|':UITextEffectsWindow:0x15ce694a0)>")
Will attempt to recover by breaking constraint
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.
2015-10-26 00:48:44.446 XXXXX[5790:2031206] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<XXXXXX.CreateAnAccountViewController 0x15cd1fd40> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key SignUpLabel.'
*** First throw call stack:
(0x185198f5c 0x19a67ff80 0x185198c1c 0x18600f534 0x18aa4f9b8 0x18ab9b4b8 0x1850c2acc 0x18ab99ea0 0x18aa52cfc 0x18a827ea8 0x18a6ef258 0x18a6ef1b0 0x18af713a4 0x18aa3705c 0x18aa5c508 0x18aa5f294 0x18a7e60c0 0x18adea5d8 0x18adddcf8 0x18adddafc 0x18addddc4 0x18a7263e4 0x18a726360 0x18a70ec88 0x18a725c78 0x18a7258a8 0x18a71eadc 0x18a6efa2c 0x18a6edf18 0x1851505a4 0x185150038 0x18514dd38 0x18507cdc0 0x190518088 0x18a756f60 0x1000d56e4 0x19ae9e8b8)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)