ios - Hiding a toolbar element when UITableView scrolls (similar to Facebook's app?) -

how can achieve effect?

full top view http://i39.tinypic.com/f0vx4l.png half top view http://i40.tinypic.com/2w7486r.png top view hidden http://i42.tinypic.com/k95r9.png

this isn't noticeable screenshots, believe want header toolbar slide user scrolls, right? (i'd suggest clarifying on part)

you can few ways, , in of them have implement own scrolling logic, meaning how header toolbar slides depending on have scrolled. said, here's how it:

1. if you're using uitableview, assume you've got view controller set delegate. since uitableview subclass of uiscrollview already, add uiscrollviewdelegate view controller. give scroll events happen. you'll want logic in scrollviewdidscroll:.

2.. if you're using uiscrollview, set view controller delegate, implement uiscrollviewdelegate, , logic in scrollviewdidscroll:.

that said, code might this:

- (void) scrollviewdidscroll:(uiscrollview *)scrollview {     cgpoint scrollpos = scrollview.contentoffset;      if(scrollpos.y >= 40 /* or cgrectgetheight(yourtoolbar.frame) */){         // hide toolbar     } else {         // slide incrementally, etc.     } } 

anyway, hope helped.