July 2012
Intermediate to advanced
360 pages
7h 44m
French
Content preview from Programmation iOS 5 pour iPhone et iPadBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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17910Listes déroulantes:les PickerViews
Au-delà de la présentation et de l’utilisation des PickerViews, ce chapitre va revenir sur deux design patterns très importants pour structurer les échanges entre vos contrôleurs de vue et les vues : la délégation de contrôle et les sources de données.
Le design pattern délégation de contrôle
Nous avons présenté au chapitre 3 le design pattern délégation de contrôle et un cas d’utilisation avec le délégué de l’application.
Le schéma suivant résume le fonctionnement d’un PickerView :
Après avoir alloué le PickerView dans la vue, le delegate et le dataSource sont positionnés.
Le dataSource va permettre de répondre à la méthode numberOfComponents:inPickerView : et retourner le nombre de composants à allouer. ...
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