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) inmake.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:0x60000385f660@GoodsTypeInputCollectionViewCell.swift#22 UITextView:0x7fbb870f1000.top ==app.GoodsTypeInputCollectionViewCell:0x7fbb86c4a430.top + 10.0>,
<SnapKit.LayoutConstraint:0x60000385f720@GoodsTypeInputCollectionViewCell.swift#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:0x60000385f720@GoodsTypeInputCollectionViewCell.swift#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) inmake.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

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