{"id":543,"date":"2018-02-23T23:39:08","date_gmt":"2018-02-23T15:39:08","guid":{"rendered":"http:\/\/60.205.208.74\/2018\/02\/23\/swift-%e6%9e%90%e6%9e%84%e8%bf%87%e7%a8%8b\/"},"modified":"2018-02-23T23:39:08","modified_gmt":"2018-02-23T15:39:08","slug":"swift-%e6%9e%90%e6%9e%84%e8%bf%87%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.puzi7.net\/?p=543","title":{"rendered":"Swift \u6790\u6784\u8fc7\u7a0b"},"content":{"rendered":"<span itemprop=\"description\"><div class=\"article-body\">\n<div class=\"article-intro\" id=\"content\">\n<h1>Swift \u6790\u6784\u8fc7\u7a0b<\/h1>\n<p>\u5728\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u88ab\u91ca\u653e\u4e4b\u524d\uff0c\u6790\u6784\u51fd\u6570\u88ab\u7acb\u5373\u8c03\u7528\u3002\u7528\u5173\u952e\u5b57<code>deinit<\/code>\u6765\u6807\u793a\u6790\u6784\u51fd\u6570\uff0c\u7c7b\u4f3c\u4e8e\u521d\u59cb\u5316\u51fd\u6570\u7528<code>init<\/code>\u6765\u6807\u793a\u3002\u6790\u6784\u51fd\u6570\u53ea\u9002\u7528\u4e8e\u7c7b\u7c7b\u578b\u3002<\/p>\n<hr>\n<h2>\u6790\u6784\u8fc7\u7a0b\u539f\u7406<\/h2>\n<p>Swift \u4f1a\u81ea\u52a8\u91ca\u653e\u4e0d\u518d\u9700\u8981\u7684\u5b9e\u4f8b\u4ee5\u91ca\u653e\u8d44\u6e90\u3002<\/p>\n<p>Swift \u901a\u8fc7\u81ea\u52a8\u5f15\u7528\u8ba1\u6570\uff08ARC\uff09\u5904\u7406\u5b9e\u4f8b\u7684\u5185\u5b58\u7ba1\u7406\u3002<\/p>\n<p>\u901a\u5e38\u5f53\u4f60\u7684\u5b9e\u4f8b\u88ab\u91ca\u653e\u65f6\u4e0d\u9700\u8981\u624b\u52a8\u5730\u53bb\u6e05\u7406\u3002\u4f46\u662f\uff0c\u5f53\u4f7f\u7528\u81ea\u5df1\u7684\u8d44\u6e90\u65f6\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u8fdb\u884c\u4e00\u4e9b\u989d\u5916\u7684\u6e05\u7406\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u521b\u5efa\u4e86\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684\u7c7b\u6765\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\uff0c\u5e76\u5199\u5165\u4e00\u4e9b\u6570\u636e\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u5728\u7c7b\u5b9e\u4f8b\u88ab\u91ca\u653e\u4e4b\u524d\u5173\u95ed\u8be5\u6587\u4ef6\u3002<\/p>\n<h3>\u8bed\u6cd5<\/h3>\n<p>\u5728\u7c7b\u7684\u5b9a\u4e49\u4e2d\uff0c\u6bcf\u4e2a\u7c7b\u6700\u591a\u53ea\u80fd\u6709\u4e00\u4e2a\u6790\u6784\u51fd\u6570\u3002\u6790\u6784\u51fd\u6570\u4e0d\u5e26\u4efb\u4f55\u53c2\u6570\uff0c\u5728\u5199\u6cd5\u4e0a\u4e0d\u5e26\u62ec\u53f7\uff1a<\/p>\n<pre>\ndeinit {\n    \/\/ \u6267\u884c\u6790\u6784\u8fc7\u7a0b\n}\n<\/pre>\n<h3>\u5b9e\u4f8b<\/h3>\n<pre>\nvar counter = 0;  \/\/ \u5f15\u7528\u8ba1\u6570\u5668\nclass BaseClass {\n    init() {\n        counter += 1;\n    }\n    deinit {\n        counter -= 1;\n    }\n}\n\nvar show: BaseClass? = BaseClass()\nprint(counter)\nshow = nil\nprint(counter)\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n1\n0\n<\/pre>\n<p>\u5f53 show = nil \u8bed\u53e5\u6267\u884c\u540e\uff0c\u8ba1\u7b97\u5668\u51cf\u53bb 1\uff0cshow \u5360\u7528\u7684\u5185\u5b58\u5c31\u4f1a\u91ca\u653e\u3002<\/p>\n<pre>\nvar counter = 0;  \/\/ \u5f15\u7528\u8ba1\u6570\u5668\n\nclass BaseClass {\n    init() {\n        counter += 1;\n    }\n    \n    deinit {\n        counter -= 1;\n    }\n}\n\nvar show: BaseClass? = BaseClass()\n\nprint(counter)\nprint(counter)\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n1\n1\n<\/pre>\n<\/p><\/div>\n<\/p><\/div>\n<span>","protected":false},"excerpt":{"rendered":"<p class=\"excerpt\"><span itemprop=\"description\">Swift \u6790\u6784\u8fc7\u7a0b \u5728\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u88ab\u91ca\u653e\u4e4b\u524d\uff0c\u6790\u6784\u51fd\u6570\u88ab\u7acb\u5373\u8c03\u7528\u3002\u7528\u5173\u952e\u5b57deinit\u6765&hellip;<\/span><\/p>\n<p class=\"more-link-p btn-align-right\"><a class=\"green zoom-btn\" href=\"https:\/\/www.puzi7.net\/?p=543\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,28],"tags":[74,119],"class_list":["post-543","post","type-post","status-publish","format-standard","hentry","category-mobile","category-swift","tag-ios","tag-swift","zoom-theme-has-thumb"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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