以编程方式添加约束
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【中文标题】以编程方式添加约束【英文标题】：Add constraints programmatically 【发布时间】：2016-08-17 09:17:06 【问题描述】：我想以编程方式将 5 个按钮放在屏幕上。
我希望它们在视图底部上方 17 像素，每个按钮之间有 20 像素的空间。
我是这样做的：
let button1 = UIButton(frame: CGRectMake(20, 48, 50, 50))
button1.setImage(UIImage(named: "button1"), forState: .Normal)
let button2 = UIButton(frame: CGRectMake(91, 48, 50, 50))
button2.setImage(UIImage(named: "button2"), forState: .Normal)
let button3 = UIButton(frame: CGRectMake(162, 48, 50, 50))
button3.setImage(UIImage(named: "button3"), forState: .Normal)
let button4 = UIButton(frame: CGRectMake(233, 48, 50, 50))
button4.setImage(UIImage(named: "button4"), forState: .Normal)
let button5 = UIButton(frame: CGRectMake(304, 48, 50, 50))
button5.setImage(UIImage(named: "button5"), forState: .Normal)
self.addSubview(button1)
self.addSubview(button2)
self.addSubview(button3)
self.addSubview(button4)
self.addSubview(button5)
我工作得很好，正是我想要的！但只是在 iPhone 6s 屏幕尺寸上，所以我想让它在所有屏幕尺寸上工作的方法是使用约束，问题是我不知道如何。
有人可以帮我吗？
谢谢！
SaintThread 回答，记录错误：
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:0x7d968a10 h=--& v=--& UIButton:0x79729670.midX == + 45>",
"<NSLayoutConstraint:0x79725610 H:|-(48)-[UIButton:0x79729670] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>",
"<NSLayoutConstraint:0x797255e0 H:[UIButton:0x79729670(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x797255e0 H:[UIButton:0x79729670(50)]>
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.
2016-08-17 12:49:14.305 Arounder[3992:10988727] 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:0x7d968a10 h=--& v=--& UIButton:0x79729670.midX == + 45>",
"<NSLayoutConstraint:0x79725610 H:|-(48)-[UIButton:0x79729670] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725610 H:|-(48)-[UIButton:0x79729670] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>
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.
2016-08-17 12:49:14.305 Arounder[3992:10988727] 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:0x7d96a3c0 h=--& v=--& UIButton:0x79729670.midY == + 73>",
"<NSLayoutConstraint:0x79725c50 V:|-(20)-[UIButton:0x79729670] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>",
"<NSLayoutConstraint:0x79725ad0 V:[UIButton:0x79729670(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725ad0 V:[UIButton:0x79729670(50)]>
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.
2016-08-17 12:49:14.306 Arounder[3992:10988727] 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:0x7d96a3c0 h=--& v=--& UIButton:0x79729670.midY == + 73>",
"<NSAutoresizingMaskLayoutConstraint:0x7d96a3f0 h=--& v=--& V:[UIButton:0x79729670(50)]>",
"<NSLayoutConstraint:0x79725c50 V:|-(20)-[UIButton:0x79729670] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725c50 V:|-(20)-[UIButton:0x79729670] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>
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.
2016-08-17 12:49:14.306 Arounder[3992:10988727] 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:0x7a991c60 h=--& v=--& UIButton:0x79729080.midX == + 116>",
"<NSLayoutConstraint:0x79725560 H:|-(48)-[UIButton:0x79729080] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>",
"<NSLayoutConstraint:0x79725510 H:[UIButton:0x79729080(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725510 H:[UIButton:0x79729080(50)]>
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.
2016-08-17 12:49:14.306 Arounder[3992:10988727] 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:0x7a991c60 h=--& v=--& UIButton:0x79729080.midX == + 116>",
"<NSAutoresizingMaskLayoutConstraint:0x7a991c90 h=--& v=--& H:[UIButton:0x79729080(50)]>",
"<NSLayoutConstraint:0x79725560 H:|-(48)-[UIButton:0x79729080] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725560 H:|-(48)-[UIButton:0x79729080] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>
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.
2016-08-17 12:49:14.307 Arounder[3992:10988727] 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:0x7d96a3c0 h=--& v=--& UIButton:0x79729670.midY == + 73>",
"<NSAutoresizingMaskLayoutConstraint:0x7d96a3f0 h=--& v=--& V:[UIButton:0x79729670(50)]>",
"<NSAutoresizingMaskLayoutConstraint:0x7a991cc0 h=--& v=--& UIButton:0x79729080.midY == + 73>",
"<NSLayoutConstraint:0x79725a10 V:[UIButton:0x79729670]-(20)-[UIButton:0x79729080]>",
"<NSLayoutConstraint:0x797259e0 V:[UIButton:0x79729080(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x797259e0 V:[UIButton:0x79729080(50)]>
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.
2016-08-17 12:49:14.307 Arounder[3992:10988727] 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:0x7d96a3c0 h=--& v=--& UIButton:0x79729670.midY == + 73>",
"<NSAutoresizingMaskLayoutConstraint:0x7d96a3f0 h=--& v=--& V:[UIButton:0x79729670(50)]>",
"<NSAutoresizingMaskLayoutConstraint:0x7a991cc0 h=--& v=--& UIButton:0x79729080.midY == + 73>",
"<NSLayoutConstraint:0x79725a10 V:[UIButton:0x79729670]-(20)-[UIButton:0x79729080]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725a10 V:[UIButton:0x79729670]-(20)-[UIButton:0x79729080]>
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.
2016-08-17 12:49:14.307 Arounder[3992:10988727] 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:0x7d96b720 h=--& v=--& UIButton:0x79728480.midX == + 187>",
"<NSLayoutConstraint:0x79725490 H:|-(48)-[UIButton:0x79728480] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>",
"<NSLayoutConstraint:0x79725440 H:[UIButton:0x79728480(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725440 H:[UIButton:0x79728480(50)]>
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.
2016-08-17 12:49:14.308 Arounder[3992:10988727] 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:0x7d96b720 h=--& v=--& UIButton:0x79728480.midX == + 187>",
"<NSAutoresizingMaskLayoutConstraint:0x7d96b750 h=--& v=--& H:[UIButton:0x79728480(50)]>",
"<NSLayoutConstraint:0x79725490 H:|-(48)-[UIButton:0x79728480] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725490 H:|-(48)-[UIButton:0x79728480] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>
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.
2016-08-17 12:49:14.308 Arounder[3992:10988727] 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:0x7a991cc0 h=--& v=--& UIButton:0x79729080.midY == + 73>",
"<NSAutoresizingMaskLayoutConstraint:0x7a991cf0 h=--& v=--& V:[UIButton:0x79729080(50)]>",
"<NSAutoresizingMaskLayoutConstraint:0x7d96c260 h=--& v=--& UIButton:0x79728480.midY == + 73>",
"<NSLayoutConstraint:0x797259b0 V:[UIButton:0x79729080]-(20)-[UIButton:0x79728480]>",
"<NSLayoutConstraint:0x79725980 V:[UIButton:0x79728480(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725980 V:[UIButton:0x79728480(50)]>
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.
2016-08-17 12:49:14.308 Arounder[3992:10988727] 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:0x7a991cc0 h=--& v=--& UIButton:0x79729080.midY == + 73>",
"<NSAutoresizingMaskLayoutConstraint:0x7a991cf0 h=--& v=--& V:[UIButton:0x79729080(50)]>",
"<NSAutoresizingMaskLayoutConstraint:0x7d96c260 h=--& v=--& UIButton:0x79728480.midY == + 73>",
"<NSLayoutConstraint:0x797259b0 V:[UIButton:0x79729080]-(20)-[UIButton:0x79728480]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x797259b0 V:[UIButton:0x79729080]-(20)-[UIButton:0x79728480]>
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.
2016-08-17 12:49:14.309 Arounder[3992:10988727] 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:0x7aad76b0 h=--& v=--& UIButton:0x79727bc0.midX == + 258>",
"<NSLayoutConstraint:0x797253b0 H:|-(48)-[UIButton:0x79727bc0] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>",
"<NSLayoutConstraint:0x79725380 H:[UIButton:0x79727bc0(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725380 H:[UIButton:0x79727bc0(50)]>
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.
2016-08-17 12:49:14.309 Arounder[3992:10988727] 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:0x7aad76b0 h=--& v=--& UIButton:0x79727bc0.midX == + 258>",
"<NSAutoresizingMaskLayoutConstraint:0x7aad76e0 h=--& v=--& H:[UIButton:0x79727bc0(50)]>",
"<NSLayoutConstraint:0x797253b0 H:|-(48)-[UIButton:0x79727bc0] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x797253b0 H:|-(48)-[UIButton:0x79727bc0] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>
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.
2016-08-17 12:49:14.309 Arounder[3992:10988727] 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:0x7d96c260 h=--& v=--& UIButton:0x79728480.midY == + 73>",
"<NSAutoresizingMaskLayoutConstraint:0x7d96c290 h=--& v=--& V:[UIButton:0x79728480(50)]>",
"<NSAutoresizingMaskLayoutConstraint:0x7aad7710 h=--& v=--& UIButton:0x79727bc0.midY == + 73>",
"<NSLayoutConstraint:0x79725950 V:[UIButton:0x79728480]-(20)-[UIButton:0x79727bc0]>",
"<NSLayoutConstraint:0x79725920 V:[UIButton:0x79727bc0(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725920 V:[UIButton:0x79727bc0(50)]>
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.
2016-08-17 12:49:14.309 Arounder[3992:10988727] 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:0x7d96c260 h=--& v=--& UIButton:0x79728480.midY == + 73>",
"<NSAutoresizingMaskLayoutConstraint:0x7d96c290 h=--& v=--& V:[UIButton:0x79728480(50)]>",
"<NSAutoresizingMaskLayoutConstraint:0x7aad7710 h=--& v=--& UIButton:0x79727bc0.midY == + 73>",
"<NSLayoutConstraint:0x79725950 V:[UIButton:0x79728480]-(20)-[UIButton:0x79727bc0]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725950 V:[UIButton:0x79728480]-(20)-[UIButton:0x79727bc0]>
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.
2016-08-17 12:49:14.310 Arounder[3992:10988727] 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:0x7a993980 h=--& v=--& UIButton:0x797270c0.midX == + 329>",
"<NSLayoutConstraint:0x797252e0 H:|-(48)-[UIButton:0x797270c0] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>",
"<NSLayoutConstraint:0x79725290 H:[UIButton:0x797270c0(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x79725290 H:[UIButton:0x797270c0(50)]>
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.
2016-08-17 12:49:14.310 Arounder[3992:10988727] 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:0x7a993980 h=--& v=--& UIButton:0x797270c0.midX == + 329>",
"<NSAutoresizingMaskLayoutConstraint:0x7a9939b0 h=--& v=--& H:[UIButton:0x797270c0(50)]>",
"<NSLayoutConstraint:0x797252e0 H:|-(48)-[UIButton:0x797270c0] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x797252e0 H:|-(48)-[UIButton:0x797270c0] (Names: '|':Arounder.CategoriesBarView:0x797c7190 )>
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.
2016-08-17 12:49:14.310 Arounder[3992:10988727] 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:0x7aad7710 h=--& v=--& UIButton:0x79727bc0.midY == + 73>",
"<NSAutoresizingMaskLayoutConstraint:0x7aad7a50 h=--& v=--& V:[UIButton:0x79727bc0(50)]>",
"<NSAutoresizingMaskLayoutConstraint:0x7a993510 h=--& v=--& UIButton:0x797270c0.midY == + 73>",
"<NSLayoutConstraint:0x797258d0 V:[UIButton:0x79727bc0]-(20)-[UIButton:0x797270c0]>",
"<NSLayoutConstraint:0x797258a0 V:[UIButton:0x797270c0(50)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x797258a0 V:[UIButton:0x797270c0(50)]>
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.
2016-08-17 12:49:14.311 Arounder[3992:10988727] 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:0x7aad7710 h=--& v=--& UIButton:0x79727bc0.midY == + 73>",
"<NSAutoresizingMaskLayoutConstraint:0x7aad7a50 h=--& v=--& V:[UIButton:0x79727bc0(50)]>",
"<NSAutoresizingMaskLayoutConstraint:0x7a993510 h=--& v=--& UIButton:0x797270c0.midY == + 73>",
"<NSLayoutConstraint:0x797258d0 V:[UIButton:0x79727bc0]-(20)-[UIButton:0x797270c0]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x797258d0 V:[UIButton:0x79727bc0]-(20)-[UIButton:0x797270c0]>
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.
【问题讨论】：
【参考方案1】：iOS 8 安全
在添加要查看的按钮之前
button1.translatesAutoresizingMaskIntoConstraints = false
button2.translatesAutoresizingMaskIntoConstraints = false
button3.translatesAutoresizingMaskIntoConstraints = false
button4.translatesAutoresizingMaskIntoConstraints = false
button5.translatesAutoresizingMaskIntoConstraints = false
添加按钮后查看
let views = ["button1": button1,
"button2": button2,
"button3": button3,
"button4": button4,
"button5": button5]
let buttonConstraintsH = NSLayoutConstraint.constraintsWithVisualFormat(
"H:|-20-[button1]-20-[button2]-20-[button3]-20-[button4]-20-[button5]-20-|",
options: [],
metrics: nil,
views: views)
let button1ConstraintsV = NSLayoutConstraint.constraintsWithVisualFormat(
"V:[button1]-17-|",
options: [],
metrics: nil,
views: views)
let button2ConstraintsV = NSLayoutConstraint.constraintsWithVisualFormat(
"V:[button2]-17-|",
options: [],
metrics: nil,
views: views)
let button3ConstraintsV = NSLayoutConstraint.constraintsWithVisualFormat(
"V:[button3]-17-|",
options: [],
metrics: nil,
views: views)
let button4ConstraintsV = NSLayoutConstraint.constraintsWithVisualFormat(
"V:[button4]-17-|",
options: [],
metrics: nil,
views: views)
let button5ConstraintsV = NSLayoutConstraint.constraintsWithVisualFormat(
"V:[button5]-17-|",
options: [],
metrics: nil,
views: views)
NSLayoutConstraint.activateConstraints([buttonConstraintsH, button1ConstraintsV, button2ConstraintsV, button3ConstraintsV, button4ConstraintsV, button5ConstraintsV])
并且具有相同的比例（为每个按钮写下它）：
NSLayoutConstraint.activateConstraints(NSLayoutConstraint(
item:button1
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:button1
attribute:NSLayoutAttributeWidth
multiplier:1
constant:0))
【讨论】：
不行，图标太大了，我也想调整图标大小 @FS.O5 您的按钮使用的是图像还是背景图像？我的代码是 50 x 50 像素吗？ 是的，他们是。我正在使用图片 我希望所有按钮都完全适合 iPhone 6/s 屏幕，如果需要更改尺寸也没关系，目标是让它完全适合我在所有设备上的视图相同的。我该怎么做？ @FS.O5 试试这个：button.imageEdgeInsets = UIEdgeInsetsMake(5, 5, 5, 5) 并检查图像是否更小【参考方案2】：我建议您阅读有关 NSLayoutAnchor (read more) 的更多信息，这是一种更简单的创建约束的方法。
短sn-p：
self.add
self.addSubview(button1)
self.addSubview(button2)
self.addSubview(button3)
self.addSubview(button4)
self.addSubview(button5)
button1.widthAnchor.constraintEqualToConstant(50).active = true
button1.heightAnchor.constraintEqualToConstant(50).active = true
button1.leadingAnchor.constraintEqualToAnchor(self.leadingAnchor, constant: 20).active = true
button1.topAnchor.constraintEqualToAnchor(self.topAnchor, constant: 50).active = true
....
【讨论】：
不行，图标太大了，我也想调整图标大小以上是关于以编程方式添加约束的主要内容，如果未能解决你的问题，请参考以下文章