#import <QuartzCore/QuartzCore.h> self.layer.masksToBounds = NO; self.layer.cornerRadius = 8; // if you like rounded corners self.layer.shadowOffset = CGSizeMake(0, -10); // 上向きの影 self.layer.shadowRadius = 3; self.layer.shadowOpacity = 0.8; 上の方法は簡単だが、アニメーション、リサイズする際などに遅い。 以下の blog 記事が詳しい。 結局影の画像を貼っちゃうのが簡単で速度も速そう。
![UIView に影をつける - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/b4e6768d358d0a0da681c96dc13ecf297cd0f8bc/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9VUlWaWV3JTIwJUUzJTgxJUFCJUU1JUJEJUIxJUUzJTgyJTkyJUUzJTgxJUE0JUUzJTgxJTkxJUUzJTgyJThCJnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnR4dC1jb2xvcj0lMjMxRTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9NTYmcz0yYTg0ZGU3YjdjZDJlMTdiZDE0ZmMwYmRiOTUxZGMzZA%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDBrYXdhY2hpJnR4dC1jb2xvcj0lMjMxRTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz1jMmU5ZmJmZDEyNGYyMzYyMjc3YjM0YjdiNjIzNWM5NQ%26blend-x%3D142%26blend-y%3D436%26blend-mode%3Dnormal%26txt64%3DaW4g5qCq5byP5Lya56S-RkxJTlRFUlM%26txt-width%3D770%26txt-clip%3Dend%252Cellipsis%26txt-color%3D%25231E2121%26txt-font%3DHiragino%2520Sans%2520W6%26txt-size%3D36%26txt-x%3D156%26txt-y%3D536%26s%3D2a286d9562e44820f702bc8cff50415a)