{"id":19409,"date":"2018-10-04T19:06:52","date_gmt":"2018-10-04T10:06:52","guid":{"rendered":"https:\/\/vitalify.jp\/blog\/?p=19409"},"modified":"2024-04-26T14:18:38","modified_gmt":"2024-04-26T05:18:38","slug":"%e7%90%86%e7%94%b1%e3%81%a7extension%e9%9b%86%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e3%81%93%e3%81%a8%e4%bd%bf%e7%94%a8%e3%81%a0%e3%81%a8%e3%81%84%e3%81%86%e8%a9%b1%e3%80%90swift4%e3%80%91","status":"publish","type":"post","link":"https:\/\/vitalify.jp\/blog\/2018\/10\/%e7%90%86%e7%94%b1%e3%81%a7extension%e9%9b%86%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e3%81%93%e3%81%a8%e4%bd%bf%e7%94%a8%e3%81%a0%e3%81%a8%e3%81%84%e3%81%86%e8%a9%b1%e3%80%90swift4%e3%80%91.html","title":{"rendered":"Extension\u96c6\u3092\u4f5c\u6210\u3059\u308b\u3068\u4fbf\u5229\u3060\u3068\u3044\u3046\u8a71\u3010Swift4\u3011"},"content":{"rendered":"<p>\u7686\u3055\u3093\u3053\u3093\u306b\u3061\u306f\u3001\u30ed\u30f3\u30a2\u30f3\u3067\u3059\u3002<\/p>\n<p>\u958b\u767a\u8005\u306e\u7686\u3055\u3093\u306b\u3001\u81ea\u5206\u306eExtension\u96c6\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u4fbf\u5229\u306b\u306a\u308a\u958b\u767a\u3082\u901f\u304f\u306a\u308b\u3068\u3044\u3046\u304a\u8a71\u3092\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br \/>\n\u3053\u306e\u30d6\u30ed\u30b0\u3067\u306f\u4f8b\u3068\u3057\u3066Swift4\u7248\u3092\u4f7f\u3044\u307e\u3059\u3002<!--more--><\/p>\n<p>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u304a\u3044\u3066\u3001\u4f3c\u3066\u3044\u308b\u6a5f\u80fd\u304c\u4e8c\u3064\u4ee5\u4e0a\u51fa\u3066\u304d\u305f\u308a\u3001\u305d\u308c\u304b\u3089\u4ed6\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u540c\u3058\u6a5f\u80fd\u304c\u5fc5\u8981\u306b\u306a\u308b\u3053\u3068\u306f\u591a\u3044\u3067\u3059\u3088\u306d\u3002<br \/>\n\u8272\u306a\u5bfe\u5fdc\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u304c\u4eca\u56de\u306fextension\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\nExtension\u3092\u4f7f\u3046\u3068\u3069\u3093\u306a\u3044\u3044\u4e8b\u304c\u3042\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<ul>\uff0a\u4ee5\u524d\u4f5c\u6210\u3057\u305f\u6a5f\u80fd\u3092\u518d\u4f7f\u7528\u3067\u304d\u308b\u305f\u3081\u3001\u958b\u767a\u304c\u901f\u304f\u306a\u308a\u307e\u3059\u3002<\/ul>\n<ul>\uff0a\u518d\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u8abf\u6574\u3055\u308c\u3066\u4e0d\u5177\u5408\u304c\u306a\u304f\u306a\u308a\u307e\u3059<\/ul>\n<ul>\uff0a\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304c\u304d\u308c\u3044\u306b\u306a\u308a\u307e\u3059\u3002<\/ul>\n<p>\u4f8b\u3068\u3057\u3066\u753b\u50cf\u306ealpha\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u6a5f\u80fd\u3067Extension\u3092\u7406\u89e3\u3057\u3066\u307f\u307e\u3057\u3087\u3046<br \/>\n<strong>\u666e\u901a\u306e\u958b\u767a\u578b\u306f\u4ee5\u4e0b\u306e\u30bd\u30fc\u30b9\u3067\u3059<\/strong><\/p>\n<ol>\nfunc hasAlpha(_ image:UIImage) -&gt; Bool {<br \/>\n\t\u3000\u3000\u3000let alpha = image.cgImage?.alphaInfo<br \/>\n\t\u3000\u3000\u3000return alpha == .first || alpha == .last || alpha == .premultipliedFirst || alpha == .premultipliedLast<br \/>\n\t}<br \/>\n  func abc()<br \/>\n  {<br \/>\n\u3000\u3000\u3000let image = &#8230;..<br \/>\n\u3000\u3000\u3000if hasAlpha(image) == true<br \/>\n\u3000\u3000\u3000{<br \/>\n\u3000\u3000\u3000\u3000\u3000\/\/,,,<br \/>\n\u3000\u3000\u3000}else{<br \/>\n\u3000\u3000\u3000\u3000\u3000\/\/&#8230;<br \/>\n\u3000\u3000\u3000}<br \/>\n  }<\/ol>\n<p><strong>extension\u3092\u4f7f\u3046\u5834\u5408\u306f<\/strong><\/p>\n<ol>\n<p>extension UIImage{<\/p>\n<ul>\nfunc hasAlpha(_ image:UIImage) -&gt; Bool {<br \/>\n\t\u3000\u3000\u3000let alpha = image.cgImage?.alphaInfo<br \/>\n\t\u3000\u3000\u3000return alpha == .first || alpha == .last || alpha == .premultipliedFirst || alpha == .premultipliedLast<br \/>\n       }<\/ul>\n<p>    }<br \/>\nfunc abc()<br \/>\n{<\/p>\n<ul>let image = &#8230;..<br \/>\n     if image.hasAlpha()<br \/>\n      {<br \/>\n        \/\/,,,<br \/>\n      }else{<br \/>\n        \/\/,,,<br \/>\n      }<\/ul>\n<p> }\n<\/ol>\n<p>\u4e0a\u306e\u4e8c\u3064\u306f\u540c\u3058\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u666e\u901a\u578b\u306e\u307b\u3046\u306fhasAlpha\u6a5f\u80fd\u304cClass\u306b\u5c5e\u3057\u3066\u304a\u308a\u3001Extension\u578b\u306fUIImage\u306b\u5c5e\u3057\u3066\u3044\u307e\u3059\u3002Class\u306b\u5c5e\u3057\u3066\u3044\u308b\u6a5f\u80fd\u3092\u4ed6\u306eClass\u3067\u4f7f\u7528\u3059\u308b\u306e\u306f\u3061\u3087\u3063\u3068\u7c21\u5358\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u304c\u3001UIImage\u306e\u5834\u5408\u306f\u4f55\u306b\u3067\u3082\u4f7f\u7528\u3067\u304d\u307e\u3059.<br \/>\n\u3053\u306e\u3088\u3046\u306a\u6c4e\u7528\u6027\u306e\u9ad8\u3044Extension\u3092\u307e\u3068\u3081\u3066\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u4ed6\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u5bb9\u6613\u306b\u518d\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<div class='wp_social_bookmarking_light'>\n            <div class=\"wsbl_facebook_like\"><div id=\"fb-root\"><\/div><fb:like href=\"https:\/\/vitalify.jp\/blog\/2018\/10\/%e7%90%86%e7%94%b1%e3%81%a7extension%e9%9b%86%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e3%81%93%e3%81%a8%e4%bd%bf%e7%94%a8%e3%81%a0%e3%81%a8%e3%81%84%e3%81%86%e8%a9%b1%e3%80%90swift4%e3%80%91.html\" layout=\"button_count\" action=\"like\" share=\"false\" show_faces=\"false\" ><\/fb:like><\/div>\n            <div class=\"wsbl_google_plus_one\"><g:plusone size=\"medium\" annotation=\"none\" href=\"https:\/\/vitalify.jp\/blog\/2018\/10\/%e7%90%86%e7%94%b1%e3%81%a7extension%e9%9b%86%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e3%81%93%e3%81%a8%e4%bd%bf%e7%94%a8%e3%81%a0%e3%81%a8%e3%81%84%e3%81%86%e8%a9%b1%e3%80%90swift4%e3%80%91.html\" ><\/g:plusone><\/div>\n            <div class=\"wsbl_hatena_button\"><a href=\"\/\/b.hatena.ne.jp\/entry\/https:\/\/vitalify.jp\/blog\/2018\/10\/%e7%90%86%e7%94%b1%e3%81%a7extension%e9%9b%86%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e3%81%93%e3%81%a8%e4%bd%bf%e7%94%a8%e3%81%a0%e3%81%a8%e3%81%84%e3%81%86%e8%a9%b1%e3%80%90swift4%e3%80%91.html\" class=\"hatena-bookmark-button\" data-hatena-bookmark-title=\"Extension\u96c6\u3092\u4f5c\u6210\u3059\u308b\u3068\u4fbf\u5229\u3060\u3068\u3044\u3046\u8a71\u3010Swift4\u3011\" data-hatena-bookmark-layout=\"standard\" title=\"\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0\"> <img src=\"\/\/b.hatena.ne.jp\/images\/entry-button\/button-only@2x.png\" alt=\"\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0\" width=\"20\" height=\"20\" style=\"border: none;\" \/><\/a><script type=\"text\/javascript\" src=\"\/\/b.hatena.ne.jp\/js\/bookmark_button.js\" charset=\"utf-8\" async=\"async\"><\/script><\/div>\n            <div class=\"wsbl_tumblr\"><a href=\"\/\/www.tumblr.com\/share?v=3&u=https%3A%2F%2Fvitalify.jp%2Fblog%2F2018%2F10%2F%25e7%2590%2586%25e7%2594%25b1%25e3%2581%25a7extension%25e9%259b%2586%25e3%2582%2592%25e4%25bd%259c%25e6%2588%2590%25e3%2581%2599%25e3%2582%258b%25e3%2581%2593%25e3%2581%25a8%25e4%25bd%25bf%25e7%2594%25a8%25e3%2581%25a0%25e3%2581%25a8%25e3%2581%2584%25e3%2581%2586%25e8%25a9%25b1%25e3%2580%2590swift4%25e3%2580%2591.html&t=Extension%E9%9B%86%E3%82%92%E4%BD%9C%E6%88%90%E3%81%99%E3%82%8B%E3%81%A8%E4%BE%BF%E5%88%A9%E3%81%A0%E3%81%A8%E3%81%84%E3%81%86%E8%A9%B1%E3%80%90Swift4%E3%80%91\" title=\"Share on Tumblr\" style=\"display:inline-block; 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