IOS uitableview Expandableheader (deformable header)

The most common header is the one in the header that is magnified when the TableView is pulled down .

Recently, I have studied it and realized this kind of header.

1. Set TableView contentinset (reserved for header) and Contentoffset (to show the top of TableView when loading is complete)

0 0 0  0true)

2. Adding a constraint to the header (Snapkit)

var headerheightconstraint:constraint? var headertopconstraint:constraint?

in = M.top.equalto (tableView.snp.top). Offset (-headerheight). Constraint        M.leading.equalto (tableView.snp.leading)    M.width.equalto (screen_width)    = M.height.equalto ( headerheight). Constraint}

3. Monitor the contentoffset of TableView and change the constraints of the header

Let Yoffset =-scrollview.contentoffset.yif yoffset >  headerheight {    Headertopconstraint?. Layoutconstraints.first?. Constant =-yoffset    headerheightconstraint? Layoutconstraints.first?. Constant = Yoffset}

4. Set the Contentmode of the header section (if the mode is not correct, the content will be scaled differently)

// mode Please choose according to the actual situation

Ficow Original, reproduced please specify the source:http://www.cnblogs.com/ficow/p/7301110.html

IOS uitableview Expandableheader (deformable header)