November 2024
Intermediate to advanced
1256 pages
39h 14m
French
Content preview from Programmation iOS 14
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Chapitre 5. Touches
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[Winifred la Woebegone illustre le hit-test :] Hé nonny nonny, c'est toi ? - Hey nonny nonny nonny non ! - Hey nonny nonny, c'est toi ? - Hey nonny nonny nonny no !
Marshall Barer, Il était une fois un matelas
Un contact est un cas où l'utilisateur pose un doigt sur l'écran. Le système et le matériel, qui travaillent ensemble, savent quand un doigt entre en contact avec l'écran et où il se trouve. Un doigt est gros, mais son emplacement est astucieusement réduit à un seul point.
Un UIResponder est un destinataire potentiel des contacts. Un UIView est un UIResponder et est le destinataire visible des touches. Il existe d'autres sous-classes d'UIResponder, mais aucune n'est visible à l'écran. L'utilisateur voit une vue en vertu de sa couche sous-jacente ; l'utilisateur touche une vue en vertu du fait qu'elle est un UIResponder.
Un toucher est représenté par un objet (une instance UITouch) qui est regroupé dans une enveloppe (un UIEvent) que le système transmet à ton application. C'est ensuite à ton application de transmettre l'enveloppe à la vue UIView appropriée. Dans la grande majorité des cas, cela se passera automatiquement comme tu le souhaites, et tu répondras à un toucher par l'intermédiaire de la vue dans laquelle le toucher s'est produit.
La plupart des vues d'interface intégrées traitent ces livraisons UITouch de bas niveau ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.