iphone - How to save tab bar order when app is terminated? -

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the following example: http://www.raddonline.com/blogs/geek-journal/iphone-sdk-uitabbarcontroller-how-to-save-user-customized-tab-order/

doesn't work in ios4.

i able save order of tabs when application shut down.

you can set application delegate uitabbarcontroller delegate, , when tab selected, can record selection [nsuserdefaults standarddefaults] integer (selected index of tab bar controller).

do in:

- (void)tabbarcontroller:(uitabbarcontroller *)tabbarcontroller didselectviewcontroller:(uiviewcontroller *)viewcontroller; {     [[nsuserdefaults standarddefaults] setinteger:tabbarcontroller.selectedindex forkey:selectedtabindex]; }

on launch, can load selected index defaults using -integerforkey: , default 0 if value not found key, or if key not parsed integer.

i wrap access saved index method:

- (nsuinteger)tabindextoselect; {     return [[nsuserdefaults standarddefaults] integerforkey:selectedtabindex]; // defaults 0 }

a note nsuserdefaults.. until syncronized, not flushed disk persistence. notice if you're debugging , terminate app, , ios hasn't automatically synchronized app's defaults. can force synchronize, prefer leave until it's done automatically. cases user switches tab, , quits, add synchronize - (void)applicationwillresignactive:(uiapplication *)application and/or - (void)applicationwillterminate:(uiapplication *)application.

referring tab order, rather selected index (my bad!).

you can set each of tab bar items unique tag number. (use enumeration in app delegate keep them unique). can this:

- (void)tabbarcontroller:(uitabbarcontroller *)tabbarcontroller didendcustomizingviewcontrollers:(nsarray *)viewcontrollers changed:(bool)changed; {     nsarray *tabbartagorder = [tabbarcontroller.tabbar.items valueforkey:@"tag"];     [[nsuserdefaults standarddefaults] setobject:tabbartagorder forkey:tabtagorder]; }

to restore order @ launch, can manually organize tab bar items in order restored defaults, , set items property of uitabbar directly.


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