user interface - iphone app UI design for add to favorites? -

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after right '+' button pressed item in view added favorites , uialertview shown on screen saying "added favorites". after added favorites make '+' button disappear same item doesn't added again favorites. not sure if ok apple's human interface guidelines instead should '+' remain there , if pressed again "this item in favorites"?

any appreciated! thanks

i wouldn't use alertview this. showing alert, force user confirm reading confirmation message , taking action (by pressing ok button). idea provide feedback favorite added, should not intrusive alert. perhaps can use other design patterns favorites, such star lights when pressed indicate item listed favorite, or perhaps animation effect 'moves' selected item visible 'favorites' category.

the human interface guidelines have this alert view (in relation question):

avoid creating unnecessary alerts.

these alerts unnecessary if they:

  • merely increase visibility of information, information related standard functioning of application. instead, should design eye-catching way display information harmonizes app’s style.

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