November 2024
Intermediate to advanced
1256 pages
39h 14m
French
Content preview from Programmation iOS 14
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Chapitre 26. Annuler
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L'idée de l'annulation est que l'utilisateur peut revenir sur une action récemment effectuée. Dans les coulisses, l'application maintient une pile interne d'actions annulables ; l'annulation annule l'action en haut de la pile, et rend également cette action disponible pour être refaite par le biais d'une pile secondaire.
Une capacité d'annulation omniprésente caractérise principalement les applications macOS de bureau, mais certaines applications iOS peuvent également bénéficier d'une fonction d'annulation limitée, et certaines vues intégrées - en particulier celles qui impliquent la saisie de texte(Chapitre 11) - l'implémentent déjà. UIDocument (voir le chapitre 23) s'intègre à ton dispositif d'annulation pour mettre à jour automatiquement l'état "sale" du document.
L'annulation fonctionne par l'intermédiaire d'un gestionnaire d'annulation - une instance de UndoManager. Chaque fois que l'utilisateur effectue une action qui doit pouvoir être annulée, tu enregistres cette action auprès du gestionnaire d'annulation. Lorsque l'utilisateur demande à annuler, tu envoies undo au gestionnaire d'annulation ; lorsque l'utilisateur demande à refaire, tu envoies redo au gestionnaire d'annulation. Dans les deux cas, le gestionnaire d'annulation effectue l'action enregistrée et ajuste ses piles internes d'annulation et de rétablissement en ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.