1.Constraints priority

将evInputView的高度约束的priority设为750,evInputView的inputTextView如果不设高度约束，那么高度就是defaultInputViewH,如果设了高度，那么就是这个高度.

 

        evInputView.snp.remakeConstraints { (make) in

            make.left.right.equalTo(0)

            make.bottom.equalTo(bottom)

            make.height.equalTo(defaultInputViewH).priority(750)

        }

 

 

        inputTextView.snp.remakeConstraints { (make) in

            make.top.equalTo(textViewFrame.top)

            make.bottom.equalTo(textViewFrame.bottom)

            make.left.equalTo(textViewFrame.left)

            make.right.equalTo(textViewFrame.right)

        }

 

        inputTextView.snp.remakeConstraints { (make) in

            make.top.equalTo(textViewFrame.top)

            make.bottom.equalTo(textViewFrame.bottom)

            make.left.equalTo(textViewFrame.left)

            make.right.equalTo(textViewFrame.right)

            make.height.equalTo(height)

        }

 

 

https://segmentfault.com/a/1190000004650551

https://github.com/February12/YLBaseChat/