Unable to simultaneously satisfy constraints.

开发版本  7.0 

@property(nonatomic) BOOL translatesAutoresizingMaskIntoConstraints NS_AVAILABLE_IOS(6_0); // Default YES

此属性 6.0 版本

错误提示:

 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:0x7ffd30d86570 h=--& v=--& H:[UIView:0x7ffd30f33d50(640)]>",
    "<NSLayoutConstraint:0x7ffd33065d20 H:[UIImageView:0x7ffd30f341c0]-(0)-|   (Names: '|':UIView:0x7ffd30f34030 )>",
    "<NSLayoutConstraint:0x7ffd30eaa760 H:|-(0)-[UIImageView:0x7ffd30f341c0]   (Names: '|':UIView:0x7ffd30f34030 )>",
    "<NSLayoutConstraint:0x7ffd330bf740 UIView:0x7ffd30f33d50.width == 2*UIImageView:0x7ffd30f341c0.width>",
    "<NSLayoutConstraint:0x7ffd30d944d0 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7ffd30f34030(375)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7ffd33065d20 H:[UIImageView:0x7ffd30f341c0]-(0)-|   (Names: '|':UIView:0x7ffd30f34030 )>

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.

 解决办法:

出错的View . translatesAutoresizingMaskIntoConstraints = NO ;即可解决

无意之中发现只要设置xib 中的size 为任意的iphone 尺寸也能解决上面的问题, 不能死inferred!!!