ios SnapKit 约束Unable to simultaneously satisfy constraints 和UIView-Encapsulated-Layout-Height的警告

最近在自定义UICollectionViewCell，cell里面UITextView约束如下：

        inputTextView.snp.makeConstraints { (make) in
            make.left.top.equalTo(self).offset(kAdaptedWidth(10))
            make.right.bottom.equalTo(self).offset(kAdaptedWidth(-10))

        }

结果编译报以下打印警告：

[LayoutConstraints] 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. 
<__NSArrayI 0x60000128e9d0>(
<SnapKit.LayoutConstraint:[email protected]#22 UITextView:0x7fbb870f1000.top ==app.GoodsTypeInputCollectionViewCell:0x7fbb86c4a430.top + 10.0>,
<SnapKit.LayoutConstraint:[email protected]#24 UITextView:0x7fbb870f1000.bottom == app.HYGoodsTypeInputCollectionViewCell:0x7fbb86c4a430.bottom - 10.0>,
<NSLayoutConstraint:0x600003f528a0 'UIView-Encapsulated-Layout-Height' app.GoodsTypeInputCollectionViewCell:0x7fbb86c4a430.height == 0   (active)>
)


Will attempt to recover by breaking constraint 
<SnapKit.LayoutConstraint:[email protected]#24 UITextView:0x7fbb870f1000.bottom == app.GoodsTypeInputCollectionViewCell:0x7fbb86c4a430.bottom - 10.0>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.

原因是我的cell刚开始高度为0，在某些条件下，会变成另外一个height,然而由于CollectionView会默认添加两个约束就是UIView-Encapsulated-Layout-Width 和UIView-Encapsulated-Layout-Hight保证大小适中，但是我的cell的高度刚开始默认为0，它的系统默认约束和我的设置的约束权限冲突，造成的。

因此只需要降低自己约束权限就行了：

        inputTextView.snp.makeConstraints { (make) in
            make.left.top.equalTo(self).offset(kAdaptedWidth(10))
            make.right.equalTo(self).offset(kAdaptedWidth(-10))
            make.bottom.equalTo(self).offset(kAdaptedWidth(-10)).priorityLow()

        }

这样都没有约束警告log