iphone - Make scrollView lock into certain offsets -


first off, didn't know how search this, why posted question. i'm sorry if it's been asked, haven't found it.

i want make scrollview app drawer, has 3 possible offsets (like screen).

here's code tried, works if drag , not take finger till scrolling ends, doesn't end if swipe:

- (void)scrollviewdidenddragging:(uiscrollview *)scrollview willdecelerate:(bool)decelerate { if (scrollview.contentoffset.x >= 0 && scrollview.contentoffset.x <= 640) {     if (oldoffset == 0)     {         if (scrollview.contentoffset.x > 100 && scrollview.contentoffset.x < 420)         {             [scrollview setcontentoffset:cgpointmake(320, 0) animated:no];             oldoffset = 320;         }         else if (scrollview.contentoffset.x > 420)         {             [scrollview setcontentoffset:cgpointmake(640, 0) animated:no];             oldoffset = 640;         }         else         {             [scrollview setcontentoffset:cgpointmake(0, 0) animated:no];         }     }     else if (oldoffset == 320)     {         if (scrollview.contentoffset.x < 220)         {             [scrollview setcontentoffset:cgpointmake(0, 0) animated:no];             oldoffset = 0;         }         else if (scrollview.contentoffset.x > 420)         {             [scrollview setcontentoffset:cgpointmake(640, 0) animated:no];             oldoffset = 640;         }         else         {             [scrollview setcontentoffset:cgpointmake(320, 0) animated:no];         }     }     else {         if (scrollview.contentoffset.x < 220) {             [scrollview setcontentoffset:cgpointmake(0, 0) animated:no];             oldoffset = 0;         }         else if (scrollview.contentoffset.x < 540) {             [scrollview setcontentoffset:cgpointmake(320, 0) animated:no];             oldoffset = 320;         }         else         {             [scrollview setcontentoffset:cgpointmake(640, 0) animated:no];         }     } }

}

set uiscrollview's property pagingenabled yes. when enabled, scroll view automatically "snap" scrolling multiples of size (width horizontal scrolling, height vertical scrolling)

apple docs says:

pagingenabled

if value of property yes, scroll view stops on multiples of scroll view’s bounds when user scrolls. default value no.


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