运行可以了，但是会报很多警告

[realcarlos]

2016-05-04 15:24:31.521 CFCityPickerVC[17697:4651979] 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:0x1545ad770 h=-&- v=-&- CFCityPickerVC.HeaderItemView:0x1545985a0.height == UIView:0x1545903e0.height - 344>",
"<NSLayoutConstraint:0x1546434a0 V:|-(8)-[UILabel:0x1547078e0'\U5f53\U524d\U57ce\U5e02'] (Names: '|':CFCityPickerVC.HeaderItemView:0x1545985a0 )>",
"<NSLayoutConstraint:0x154642cb0 V:[UILabel:0x1547078e0'\U5f53\U524d\U57ce\U5e02']-(15)-[CFCityPickerVC.CFCPContentView:0x154598c20]>",
"<NSLayoutConstraint:0x154637570 V:[CFCityPickerVC.CFCPContentView:0x154598c20]-(15)-| (Names: '|':CFCityPickerVC.HeaderItemView:0x1545985a0 )>",
"<NSLayoutConstraint:0x154629ee0 V:|-(10)-[CFCityPickerVC.CitySearchBar:0x1545906c0] (Names: '|':UIView:0x1545903e0 )>",
"<NSLayoutConstraint:0x154631d70 V:[CFCityPickerVC.CitySearchBar:0x1545906c0(36)]>",
"<NSLayoutConstraint:0x154631dc0 V:[CFCityPickerVC.CitySearchBar:0x1545906c0]-(0)-| (Names: '|':UIView:0x1545903e0 )>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x154642cb0 V:[UILabel:0x1547078e0'当前城市']-(15)-[CFCityPickerVC.CFCPContentView:0x154598c20]>

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.
2016-05-04 15:24:31.523 CFCityPickerVC[17697:4651979] 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:0x1545ad770 h=-&- v=-&- CFCityPickerVC.HeaderItemView:0x1545985a0.height == UIView:0x1545903e0.height - 344>",
"<NSLayoutConstraint:0x154629ee0 V:|-(10)-[CFCityPickerVC.CitySearchBar:0x1545906c0] (Names: '|':UIView:0x1545903e0 )>",
"<NSLayoutConstraint:0x154631d70 V:[CFCityPickerVC.CitySearchBar:0x1545906c0(36)]>",
"<NSLayoutConstraint:0x154631dc0 V:[CFCityPickerVC.CitySearchBar:0x1545906c0]-(0)-| (Names: '|':UIView:0x1545903e0 )>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x154631dc0 V:[CFCityPickerVC.CitySearchBar:0x1545906c0]-(0)-| (Names: '|':UIView:0x1545903e0 )>

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.
2016-05-04 15:24:31.530 CFCityPickerVC[17697:4651979] 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:0x1545ade40 h=-&- v=-&- CFCityPickerVC.HeaderItemView:0x1545985a0.width == UIView:0x1545903e0.width>",
"<NSLayoutConstraint:0x1546434f0 UILabel:0x1547078e0'\U5f53\U524d\U57ce\U5e02'.leading == CFCityPickerVC.CFCPContentView:0x154598c20.leading>",
"<NSLayoutConstraint:0x154642d40 H:|-(18)-[UILabel:0x1547078e0'\U5f53\U524d\U57ce\U5e02'] (Names: '|':CFCityPickerVC.HeaderItemView:0x1545985a0 )>",
"<NSLayoutConstraint:0x154642c60 H:[CFCityPickerVC.CFCPContentView:0x154598c20]-(30)-| (Names: '|':CFCityPickerVC.HeaderItemView:0x1545985a0 )>",
"<NSLayoutConstraint:0x1545b3890 'UIView-Encapsulated-Layout-Width' H:[UIView:0x1545903e0(0)]>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1546434f0 UILabel:0x1547078e0'当前城市'.leading == CFCityPickerVC.CFCPContentView:0x154598c20.leading>

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.
2016-05-04 15:24:31.534 CFCityPickerVC[17697:4651979] 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:0x15471fa60 h=-&- v=-&- CFCityPickerVC.HeaderItemView:0x154704520.width == UIView:0x1545903e0.width>",
"<NSLayoutConstraint:0x15470a330 UILabel:0x1547080e0'\U70ed\U95e8\U57ce\U5e02'.leading == CFCityPickerVC.CFCPContentView:0x1547082f0.leading>",
"<NSLayoutConstraint:0x15470a380 H:|-(18)-[UILabel:0x1547080e0'\U70ed\U95e8\U57ce\U5e02'] (Names: '|':CFCityPickerVC.HeaderItemView:0x154704520 )>",
"<NSLayoutConstraint:0x15470a420 H:[CFCityPickerVC.CFCPContentView:0x1547082f0]-(30)-| (Names: '|':CFCityPickerVC.HeaderItemView:0x154704520 )>",
"<NSLayoutConstraint:0x1545b3890 'UIView-Encapsulated-Layout-Width' H:[UIView:0x1545903e0(0)]>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x15470a330 UILabel:0x1547080e0'热门城市'.leading == CFCityPickerVC.CFCPContentView:0x1547082f0.leading>

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.
2016-05-04 15:24:31.538 CFCityPickerVC[17697:4651979] 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:0x1545b1900 h=-&- v=-&- CFCityPickerVC.HeaderItemView:0x1547085d0.width == UIView:0x1545903e0.width>",
"<NSLayoutConstraint:0x154709850 UILabel:0x154708770'\U5386\U53f2\U9009\U62e9'.leading == CFCityPickerVC.CFCPContentView:0x154708d60.leading>",
"<NSLayoutConstraint:0x1547098a0 H:|-(18)-[UILabel:0x154708770'\U5386\U53f2\U9009\U62e9'] (Names: '|':CFCityPickerVC.HeaderItemView:0x1547085d0 )>",
"<NSLayoutConstraint:0x154709940 H:[CFCityPickerVC.CFCPContentView:0x154708d60]-(30)-| (Names: '|':CFCityPickerVC.HeaderItemView:0x1547085d0 )>",
"<NSLayoutConstraint:0x1545b3890 'UIView-Encapsulated-Layout-Width' H:[UIView:0x1545903e0(0)]>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x154709850 UILabel:0x154708770'历史选择'.leading == CFCityPickerVC.CFCPContentView:0x154708d60.leading>

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.
2016-05-04 15:24:31.540 CFCityPickerVC[17697:4651979] 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:0x15462a040 H:|-(18)-[CFCityPickerVC.CitySearchBar:0x1545906c0] (Names: '|':UIView:0x1545903e0 )>",
"<NSLayoutConstraint:0x154629ac0 H:[CFCityPickerVC.CitySearchBar:0x1545906c0]-(20)-| (Names: '|':UIView:0x1545903e0 )>",
"<NSLayoutConstraint:0x1545b3890 'UIView-Encapsulated-Layout-Width' H:[UIView:0x1545903e0(0)]>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x154629ac0 H:[CFCityPickerVC.CitySearchBar:0x1545906c0]-(20)-| (Names: '|':UIView:0x1545903e0 )>

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.
2016-05-04 15:24:31.545 CFCityPickerVC[17697:4651979] 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:0x15471fa60 h=-&- v=-&- CFCityPickerVC.HeaderItemView:0x154704520.width == UIView:0x1545903e0.width>",
"<NSLayoutConstraint:0x15470a380 H:|-(18)-[UILabel:0x1547080e0'\U70ed\U95e8\U57ce\U5e02'] (Names: '|':CFCityPickerVC.HeaderItemView:0x154704520 )>",
"<NSLayoutConstraint:0x15470a510 H:[UIView:0x154703d40]-(0)-| (Names: '|':CFCityPickerVC.HeaderItemView:0x154704520 )>",
"<NSLayoutConstraint:0x15470a560 H:[UILabel:0x1547080e0'\U70ed\U95e8\U57ce\U5e02']-(6)-[UIView:0x154703d40]>",
"<NSLayoutConstraint:0x1545b3890 'UIView-Encapsulated-Layout-Width' H:[UIView:0x1545903e0(0)]>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x15470a560 H:[UILabel:0x1547080e0'热门城市']-(6)-[UIView:0x154703d40]>

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.
2016-05-04 15:24:31.546 CFCityPickerVC[17697:4651979] 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:0x1545b1900 h=-&- v=-&- CFCityPickerVC.HeaderItemView:0x1547085d0.width == UIView:0x1545903e0.width>",
"<NSLayoutConstraint:0x1547098a0 H:|-(18)-[UILabel:0x154708770'\U5386\U53f2\U9009\U62e9'] (Names: '|':CFCityPickerVC.HeaderItemView:0x1547085d0 )>",
"<NSLayoutConstraint:0x154709a30 H:[UIView:0x154708ab0]-(0)-| (Names: '|':CFCityPickerVC.HeaderItemView:0x1547085d0 )>",
"<NSLayoutConstraint:0x154709a80 H:[UILabel:0x154708770'\U5386\U53f2\U9009\U62e9']-(6)-[UIView:0x154708ab0]>",
"<NSLayoutConstraint:0x1545b3890 'UIView-Encapsulated-Layout-Width' H:[UIView:0x1545903e0(0)]>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x154709a80 H:[UILabel:0x154708770'历史选择']-(6)-[UIView:0x154708ab0]>

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.
2016-05-04 15:24:31.548 CFCityPickerVC[17697:4651979] 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:0x1545ade40 h=-&- v=-&- CFCityPickerVC.HeaderItemView:0x1545985a0.width == UIView:0x1545903e0.width>",
"<NSLayoutConstraint:0x154642d40 H:|-(18)-[UILabel:0x1547078e0'\U5f53\U524d\U57ce\U5e02'] (Names: '|':CFCityPickerVC.HeaderItemView:0x1545985a0 )>",
"<NSLayoutConstraint:0x1546375c0 H:[UIView:0x154598980]-(0)-| (Names: '|':CFCityPickerVC.HeaderItemView:0x1545985a0 )>",
"<NSLayoutConstraint:0x154704e80 H:[UILabel:0x1547078e0'\U5f53\U524d\U57ce\U5e02']-(6)-[UIView:0x154598980]>",
"<NSLayoutConstraint:0x1545b3890 'UIView-Encapsulated-Layout-Width' H:[UIView:0x1545903e0(0)]>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x154704e80 H:[UILabel:0x1547078e0'当前城市']-(6)-[UIView:0x154598980]>

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.

[akring]

Autolayout约束冲突了吧