我希望能够通过编程添加约束条件,以下是我使用的代码来添加顶部和左侧的约束条件。
NSLayoutConstraint *top = [NSLayoutConstraint constraintWithItem:label1
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeTop
multiplier:1
constant:110];
NSLayoutConstraint *left = [NSLayoutConstraint constraintWithItem:label1
attribute:NSLayoutAttributeLeading
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeLeading
multiplier:1
constant:10];
我的视图控制器中添加了
lable1
。当我像这样在视图中添加这两个约束时:[self.view addConstraint:top];
[self.view addConstraint:left];
它会在控制台显示错误,并且约束不会影响标签。
2016-02-09 19:36:59.824 testinMRC[99160:313382] 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:0x7fa5c8738610 V:|-(110)-[UILabel:0x7fa5c8626940'Label'] (Names: '|':UIView:0x7fa5c86267b0 )>",
"<NSIBPrototypingLayoutConstraint:0x7fa5c8628a70 'IB auto generated at build time for view with fixed frame' V:|-(88)-[UILabel:0x7fa5c8626940'Label'] (Names: '|':UIView:0x7fa5c86267b0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x7fa5c8738610 V:|-(110)-[UILabel:0x7fa5c8626940'Label'] (Names: '|':UIView:0x7fa5c86267b0 )>
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.
2016-02-09 19:36:59.889 testinMRC[99160:313382] 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:0x7fa5c87334b0 H:|-(10)-[UILabel:0x7fa5c8626940'Label'] (Names: '|':UIView:0x7fa5c86267b0 )>",
"<NSIBPrototypingLayoutConstraint:0x7fa5c86285c0 'IB auto generated at build time for view with fixed frame' H:|-(188)-[UILabel:0x7fa5c8626940'Label'](LTR) (Names: '|':UIView:0x7fa5c86267b0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x7fa5c87334b0 H:|-(10)-[UILabel:0x7fa5c8626940'Label'] (Names: '|':UIView:0x7fa5c86267b0 )>
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.
有人可以告诉我为什么出现这个错误吗?请帮我找到解决方案。