November 2024
Intermediate to advanced
1256 pages
39h 14m
French
Content preview from Programmation iOS 14
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Chapitre 4. L'animation
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L'animation est un attribut qui change avec le temps. Il s'agit généralement d'un attribut visible d'un élément de l'interface. L'attribut changeant peut être positionnel : quelque chose bouge ou change de taille, sans sauter brusquement, mais en glissant doucement. D'autres types d'attributs peuvent également s'animer. La couleur d'arrière-plan d'une vue peut passer du rouge au vert, sans changer brusquement de couleur, mais en passant de l'une à l'autre. Une vue peut passer d'opaque à transparente, sans disparaître brusquement, mais en s'estompant.
Sans aide, la plupart d'entre nous trouveraient l'animation hors de leur portée. Il y a tout simplement trop de complications - des complications de calcul, de synchronisation, de rafraîchissement de l'écran, d'enfilage, et bien d'autres encore. Heureusement, de l'aide est fournie. Tu n'exécutes pas une animation toi-même ; tu la décris, tu la commandes et elle est exécutée pour toi. Tu obtiens une animation à la demande.
Demander une animation peut être aussi simple que de définir la valeur d'une propriété ; dans certaines circonstances, une simple ligne de code entraînera une animation :
myLayer.backgroundColor = UIColor.red.cgColor // animate to red
L'animation est facile parce qu'Apple veut te faciliter son utilisation. L'animation n'est pas seulement cool et amusante ; elle ...
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