{"id":545,"date":"2018-02-23T23:39:10","date_gmt":"2018-02-23T15:39:10","guid":{"rendered":"http:\/\/60.205.208.74\/2018\/02\/23\/swift-%e5%8f%af%e9%80%89%e9%93%be\/"},"modified":"2018-02-23T23:39:10","modified_gmt":"2018-02-23T15:39:10","slug":"swift-%e5%8f%af%e9%80%89%e9%93%be","status":"publish","type":"post","link":"https:\/\/www.puzi7.net\/?p=545","title":{"rendered":"Swift \u53ef\u9009\u94fe"},"content":{"rendered":"<span itemprop=\"description\"><div class=\"article-body\">\n<div class=\"article-intro\" id=\"content\">\n<h1>Swift \u53ef\u9009\u94fe<\/h1>\n<p>\u53ef\u9009\u94fe\uff08Optional Chaining\uff09\u662f\u4e00\u79cd\u53ef\u4ee5\u8bf7\u6c42\u548c\u8c03\u7528\u5c5e\u6027\u3001\u65b9\u6cd5\u548c\u5b50\u811a\u672c\u7684\u8fc7\u7a0b\uff0c\u7528\u4e8e\u8bf7\u6c42\u6216\u8c03\u7528\u7684\u76ee\u6807\u53ef\u80fd\u4e3anil\u3002<\/p>\n<p>\u53ef\u9009\u94fe\u8fd4\u56de\u4e24\u4e2a\u503c\uff1a<\/p>\n<ul class=\"list\">\n<li>\n<p>\u5982\u679c\u76ee\u6807\u6709\u503c\uff0c\u8c03\u7528\u5c31\u4f1a\u6210\u529f\uff0c\u8fd4\u56de\u8be5\u503c<\/p>\n<\/li>\n<li>\n<p>\u5982\u679c\u76ee\u6807\u4e3anil\uff0c\u8c03\u7528\u5c06\u8fd4\u56denil<\/p>\n<\/li>\n<\/ul>\n<p>\u591a\u6b21\u8bf7\u6c42\u6216\u8c03\u7528\u53ef\u4ee5\u88ab\u94fe\u63a5\u6210\u4e00\u4e2a\u94fe\uff0c\u5982\u679c\u4efb\u610f\u4e00\u4e2a\u8282\u70b9\u4e3anil\u5c06\u5bfc\u81f4\u6574\u6761\u94fe\u5931\u6548\u3002<\/p>\n<hr>\n<h2>\u53ef\u9009\u94fe\u53ef\u66ff\u4ee3\u5f3a\u5236\u89e3\u6790<\/h2>\n<p>\u901a\u8fc7\u5728\u5c5e\u6027\u3001\u65b9\u6cd5\u3001\u6216\u4e0b\u6807\u811a\u672c\u7684\u53ef\u9009\u503c\u540e\u9762\u653e\u4e00\u4e2a\u95ee\u53f7(?)\uff0c\u5373\u53ef\u5b9a\u4e49\u4e00\u4e2a\u53ef\u9009\u94fe\u3002<\/p>\n<table class=\"reference\">\n<tbody>\n<tr>\n<td>\u53ef\u9009\u94fe &#8216;?&#8217;<\/td>\n<td>\u611f\u53f9\u53f7\uff08!\uff09\u5f3a\u5236\u5c55\u5f00\u65b9\u6cd5\uff0c\u5c5e\u6027\uff0c\u4e0b\u6807\u811a\u672c\u53ef\u9009\u94fe<\/td>\n<\/tr>\n<tr>\n<td>? \u653e\u7f6e\u4e8e\u53ef\u9009\u503c\u540e\u6765\u8c03\u7528\u65b9\u6cd5\uff0c\u5c5e\u6027\uff0c\u4e0b\u6807\u811a\u672c<\/td>\n<td>! \u653e\u7f6e\u4e8e\u53ef\u9009\u503c\u540e\u6765\u8c03\u7528\u65b9\u6cd5\uff0c\u5c5e\u6027\uff0c\u4e0b\u6807\u811a\u672c\u6765\u5f3a\u5236\u5c55\u5f00\u503c<\/td>\n<\/tr>\n<tr>\n<td>\u5f53\u53ef\u9009\u4e3a nil \u8f93\u51fa\u6bd4\u8f83\u53cb\u597d\u7684\u9519\u8bef\u4fe1\u606f<\/td>\n<td>\u5f53\u53ef\u9009\u4e3a nil \u65f6\u5f3a\u5236\u5c55\u5f00\u6267\u884c\u9519\u8bef<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u4f7f\u7528\u611f\u53f9\u53f7(!)\u53ef\u9009\u94fe\u5b9e\u4f8b<\/h3>\n<pre>\nclass Person {\n    var residence: Residence?\n}\n\nclass Residence {\n    var numberOfRooms = 1\n}\n\nlet john = Person()\n\n\/\/\u5c06\u5bfc\u81f4\u8fd0\u884c\u65f6\u9519\u8bef\nlet roomCount = john.residence!.numberOfRooms\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\nfatal error: unexpectedly found nil while unwrapping an Optional value\n<\/pre>\n<p>\n\u60f3\u4f7f\u7528\u611f\u53f9\u53f7\uff08!\uff09\u5f3a\u5236\u89e3\u6790\u83b7\u5f97\u8fd9\u4e2a\u4ebaresidence\u5c5e\u6027numberOfRooms\u5c5e\u6027\u503c\uff0c\u5c06\u4f1a\u5f15\u53d1\u8fd0\u884c\u65f6\u9519\u8bef\uff0c\u56e0\u4e3a\u8fd9\u65f6\u6ca1\u6709\u53ef\u4ee5\u4f9b\u89e3\u6790\u7684residence\u503c\u3002\n<\/p>\n<h3>\u4f7f\u7528\u95ee\u53f7(?)\u53ef\u9009\u94fe\u5b9e\u4f8b<\/h3>\n<pre>\nclass Person {\n    var residence: Residence?\n}\n\nclass Residence {\n    var numberOfRooms = 1\n}\n\nlet john = Person()\n\n\/\/ \u94fe\u63a5\u53ef\u9009residence?\u5c5e\u6027\uff0c\u5982\u679cresidence\u5b58\u5728\u5219\u53d6\u56denumberOfRooms\u7684\u503c\nif let roomCount = john.residence?.numberOfRooms {\n    print(\"John \u7684\u623f\u95f4\u53f7\u4e3a \\(roomCount)\u3002\")\n} else {\n    print(\"\u4e0d\u80fd\u67e5\u770b\u623f\u95f4\u53f7\")\n}\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n\u4e0d\u80fd\u67e5\u770b\u623f\u95f4\u53f7\n<\/pre>\n<p>\u56e0\u4e3a\u8fd9\u79cd\u5c1d\u8bd5\u83b7\u5f97numberOfRooms\u7684\u64cd\u4f5c\u6709\u53ef\u80fd\u5931\u8d25\uff0c\u53ef\u9009\u94fe\u4f1a\u8fd4\u56deInt?\u7c7b\u578b\u503c\uff0c\u6216\u8005\u79f0\u4f5c&#8221;\u53ef\u9009Int&#8221;\u3002\u5f53residence\u662f\u7a7a\u7684\u65f6\u5019\uff08\u4e0a\u4f8b\uff09\uff0c\u9009\u62e9Int\u5c06\u4f1a\u4e3a\u7a7a\uff0c\u56e0\u6b64\u4f1a\u51fa\u73b0\u65e0\u6cd5\u8bbf\u95eenumberOfRooms\u7684\u60c5\u51b5\u3002\n<\/p>\n<p>\n\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5373\u4f7fnumberOfRooms\u662f\u975e\u53ef\u9009Int\uff08Int?\uff09\u65f6\u8fd9\u4e00\u70b9\u4e5f\u6210\u7acb\u3002\u53ea\u8981\u662f\u901a\u8fc7\u53ef\u9009\u94fe\u7684\u8bf7\u6c42\u5c31\u610f\u5473\u7740\u6700\u540enumberOfRooms\u603b\u662f\u8fd4\u56de\u4e00\u4e2aInt?\u800c\u4e0d\u662fInt\u3002\n<\/p>\n<hr>\n<h2>\u4e3a\u53ef\u9009\u94fe\u5b9a\u4e49\u6a21\u578b\u7c7b<\/h2>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528\u53ef\u9009\u94fe\u6765\u591a\u5c42\u8c03\u7528\u5c5e\u6027\uff0c\u65b9\u6cd5\uff0c\u548c\u4e0b\u6807\u811a\u672c\u3002\u8fd9\u8ba9\u4f60\u53ef\u4ee5\u5229\u7528\u5b83\u4eec\u4e4b\u95f4\u7684\u590d\u6742\u6a21\u578b\u6765\u83b7\u53d6\u66f4\u5e95\u5c42\u7684\u5c5e\u6027\uff0c\u5e76\u68c0\u67e5\u662f\u5426\u53ef\u4ee5\u6210\u529f\u83b7\u53d6\u6b64\u7c7b\u5e95\u5c42\u5c5e\u6027\u3002<\/p>\n<h3>\n\u5b9e\u4f8b<\/h3>\n<p>\u5b9a\u4e49\u4e86\u56db\u4e2a\u6a21\u578b\u7c7b\uff0c\u5176\u4e2d\u5305\u62ec\u591a\u5c42\u53ef\u9009\u94fe\uff1a<\/p>\n<pre>\nclass Person {\n    var residence: Residence?\n}\n\n\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cf rooms\uff0c\u5b83\u88ab\u521d\u59cb\u5316\u4e3a\u4e00\u4e2aRoom[]\u7c7b\u578b\u7684\u7a7a\u6570\u7ec4\nclass Residence {\n    var rooms = [Room]()\n    var numberOfRooms: Int {\n        return rooms.count\n    }\n    subscript(i: Int) -&gt; Room {\n        return rooms[i]\n    }\n    func printNumberOfRooms() {\n        print(\"\u623f\u95f4\u53f7\u4e3a \\(numberOfRooms)\")\n    }\n    var address: Address?\n}\n\n\/\/ Room \u5b9a\u4e49\u4e00\u4e2aname\u5c5e\u6027\u548c\u4e00\u4e2a\u8bbe\u5b9aroom\u540d\u7684\u521d\u59cb\u5316\u5668\nclass Room {\n    let name: String\n    init(name: String) { self.name = name }\n}\n\n\/\/ \u6a21\u578b\u4e2d\u7684\u6700\u7ec8\u7c7b\u53eb\u505aAddress\nclass Address {\n    var buildingName: String?\n    var buildingNumber: String?\n    var street: String?\n    func buildingIdentifier() -&gt; String? {\n        if (buildingName != nil) {\n            return buildingName\n        } else if (buildingNumber != nil) {\n            return buildingNumber\n        } else {\n            return nil\n        }\n    }\n}\n<\/pre>\n<hr>\n<h2>\u901a\u8fc7\u53ef\u9009\u94fe\u8c03\u7528\u65b9\u6cd5<\/h2>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528\u53ef\u9009\u94fe\u7684\u6765\u8c03\u7528\u53ef\u9009\u503c\u7684\u65b9\u6cd5\u5e76\u68c0\u67e5\u65b9\u6cd5\u8c03\u7528\u662f\u5426\u6210\u529f\u3002\u5373\u4f7f\u8fd9\u4e2a\u65b9\u6cd5\u6ca1\u6709\u8fd4\u56de\u503c\uff0c\u4f60\u4f9d\u7136\u53ef\u4ee5\u4f7f\u7528\u53ef\u9009\u94fe\u6765\u8fbe\u6210\u8fd9\u4e00\u76ee\u7684\u3002<\/p>\n<pre>\nclass Person {\n    var residence: Residence?\n}\n\n\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cf rooms\uff0c\u5b83\u88ab\u521d\u59cb\u5316\u4e3a\u4e00\u4e2aRoom[]\u7c7b\u578b\u7684\u7a7a\u6570\u7ec4\nclass Residence {\n    var rooms = [Room]()\n    var numberOfRooms: Int {\n        return rooms.count\n    }\n    subscript(i: Int) -&gt; Room {\n        return rooms[i]\n    }\n    func printNumberOfRooms() {\n        print(\"\u623f\u95f4\u53f7\u4e3a \\(numberOfRooms)\")\n    }\n    var address: Address?\n}\n\n\/\/ Room \u5b9a\u4e49\u4e00\u4e2aname\u5c5e\u6027\u548c\u4e00\u4e2a\u8bbe\u5b9aroom\u540d\u7684\u521d\u59cb\u5316\u5668\nclass Room {\n    let name: String\n    init(name: String) { self.name = name }\n}\n\n\/\/ \u6a21\u578b\u4e2d\u7684\u6700\u7ec8\u7c7b\u53eb\u505aAddress\nclass Address {\n    var buildingName: String?\n    var buildingNumber: String?\n    var street: String?\n    func buildingIdentifier() -&gt; String? {\n        if (buildingName != nil) {\n            return buildingName\n        } else if (buildingNumber != nil) {\n            return buildingNumber\n        } else {\n            return nil\n        }\n    }\n}\n\nlet john = Person()\n\n\nif ((john.residence?.printNumberOfRooms()) != nil) {\n    print(\"\u8f93\u51fa\u623f\u95f4\u53f7\")\n} else {\n    print(\"\u65e0\u6cd5\u8f93\u51fa\u623f\u95f4\u53f7\")\n}\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n\u65e0\u6cd5\u8f93\u51fa\u623f\u95f4\u53f7\n<\/pre>\n<p>\u4f7f\u7528if\u8bed\u53e5\u6765\u68c0\u67e5\u662f\u5426\u80fd\u6210\u529f\u8c03\u7528printNumberOfRooms\u65b9\u6cd5\uff1a\u5982\u679c\u65b9\u6cd5\u901a\u8fc7\u53ef\u9009\u94fe\u8c03\u7528\u6210\u529f\uff0cprintNumberOfRooms\u7684\u9690\u5f0f\u8fd4\u56de\u503c\u5c06\u4f1a\u662fVoid\uff0c\u5982\u679c\u6ca1\u6709\u6210\u529f\uff0c\u5c06\u8fd4\u56denil\u3002<\/p>\n<hr>\n<h2>\u4f7f\u7528\u53ef\u9009\u94fe\u8c03\u7528\u4e0b\u6807\u811a\u672c<\/h2>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528\u53ef\u9009\u94fe\u6765\u5c1d\u8bd5\u4ece\u4e0b\u6807\u811a\u672c\u83b7\u53d6\u503c\u5e76\u68c0\u67e5\u4e0b\u6807\u811a\u672c\u7684\u8c03\u7528\u662f\u5426\u6210\u529f\uff0c\u7136\u800c\uff0c\u4f60\u4e0d\u80fd\u901a\u8fc7\u53ef\u9009\u94fe\u6765\u8bbe\u7f6e\u4e0b\u6807\u811a\u672c\u3002<\/p>\n<h3>\u5b9e\u4f8b1<\/h3>\n<pre>\nclass Person {\n    var residence: Residence?\n}\n\n\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cf rooms\uff0c\u5b83\u88ab\u521d\u59cb\u5316\u4e3a\u4e00\u4e2aRoom[]\u7c7b\u578b\u7684\u7a7a\u6570\u7ec4\nclass Residence {\n    var rooms = [Room]()\n    var numberOfRooms: Int {\n        return rooms.count\n    }\n    subscript(i: Int) -&gt; Room {\n        return rooms[i]\n    }\n    func printNumberOfRooms() {\n        print(\"\u623f\u95f4\u53f7\u4e3a \\(numberOfRooms)\")\n    }\n    var address: Address?\n}\n\n\/\/ Room \u5b9a\u4e49\u4e00\u4e2aname\u5c5e\u6027\u548c\u4e00\u4e2a\u8bbe\u5b9aroom\u540d\u7684\u521d\u59cb\u5316\u5668\nclass Room {\n    let name: String\n    init(name: String) { self.name = name }\n}\n\n\/\/ \u6a21\u578b\u4e2d\u7684\u6700\u7ec8\u7c7b\u53eb\u505aAddress\nclass Address {\n    var buildingName: String?\n    var buildingNumber: String?\n    var street: String?\n    func buildingIdentifier() -&gt; String? {\n        if (buildingName != nil) {\n            return buildingName\n        } else if (buildingNumber != nil) {\n            return buildingNumber\n        } else {\n            return nil\n        }\n    }\n}\n\nlet john = Person()\nif let firstRoomName = john.residence?[0].name {\n    print(\"\u7b2c\u4e00\u4e2a\u623f\u95f4\u540d \\(firstRoomName).\")\n} else {\n    print(\"\u65e0\u6cd5\u68c0\u7d22\u5230\u623f\u95f4\")\n}\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n\u65e0\u6cd5\u68c0\u7d22\u5230\u623f\u95f4\n<\/pre>\n<p>\u5728\u4e0b\u6807\u811a\u672c\u8c03\u7528\u4e2d\u53ef\u9009\u94fe\u7684\u95ee\u53f7\u76f4\u63a5\u8ddf\u5728 circname.print \u7684\u540e\u9762\uff0c\u5728\u4e0b\u6807\u811a\u672c\u62ec\u53f7\u7684\u524d\u9762\uff0c\u56e0\u4e3acircname.print\u662f\u53ef\u9009\u94fe\u8bd5\u56fe\u83b7\u5f97\u7684\u53ef\u9009\u503c\u3002<\/p>\n<h3>\u5b9e\u4f8b2<\/h3>\n<p>\u5b9e\u4f8b\u4e2d\u521b\u5efa\u4e00\u4e2aResidence\u5b9e\u4f8b\u7ed9john.residence\uff0c\u4e14\u5728\u4ed6\u7684rooms\u6570\u7ec4\u4e2d\u6709\u4e00\u4e2a\u6216\u591a\u4e2aRoom\u5b9e\u4f8b\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u4f7f\u7528\u53ef\u9009\u94fe\u901a\u8fc7Residence\u4e0b\u6807\u811a\u672c\u6765\u83b7\u53d6\u5728rooms\u6570\u7ec4\u4e2d\u7684\u5b9e\u4f8b\u4e86\uff1a<\/p>\n<pre>\nclass Person {\n    var residence: Residence?\n}\n\n\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cf rooms\uff0c\u5b83\u88ab\u521d\u59cb\u5316\u4e3a\u4e00\u4e2aRoom[]\u7c7b\u578b\u7684\u7a7a\u6570\u7ec4\nclass Residence {\n    var rooms = [Room]()\n    var numberOfRooms: Int {\n        return rooms.count\n    }\n    subscript(i: Int) -&gt; Room {\n        return rooms[i]\n    }\n    func printNumberOfRooms() {\n        print(\"\u623f\u95f4\u53f7\u4e3a \\(numberOfRooms)\")\n    }\n    var address: Address?\n}\n\n\/\/ Room \u5b9a\u4e49\u4e00\u4e2aname\u5c5e\u6027\u548c\u4e00\u4e2a\u8bbe\u5b9aroom\u540d\u7684\u521d\u59cb\u5316\u5668\nclass Room {\n    let name: String\n    init(name: String) { self.name = name }\n}\n\n\/\/ \u6a21\u578b\u4e2d\u7684\u6700\u7ec8\u7c7b\u53eb\u505aAddress\nclass Address {\n    var buildingName: String?\n    var buildingNumber: String?\n    var street: String?\n    func buildingIdentifier() -&gt; String? {\n        if (buildingName != nil) {\n            return buildingName\n        } else if (buildingNumber != nil) {\n            return buildingNumber\n        } else {\n            return nil\n        }\n    }\n}\n\nlet john = Person()\nlet johnsHouse = Residence()\njohnsHouse.rooms.append(Room(name: \"\u5ba2\u5385\"))\njohnsHouse.rooms.append(Room(name: \"\u53a8\u623f\"))\njohn.residence = johnsHouse\n\nlet johnsAddress = Address()\njohnsAddress.buildingName = \"The Larches\"\njohnsAddress.street = \"Laurel Street\"\njohn.residence!.address = johnsAddress\n\nif let johnsStreet = john.residence?.address?.street {\n    print(\"John \u6240\u5728\u7684\u8857\u9053\u662f \\(johnsStreet)\u3002\")\n} else {\n    print(\"\u65e0\u6cd5\u68c0\u7d22\u5230\u5730\u5740\u3002 \")\n}\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\nJohn \u6240\u5728\u7684\u8857\u9053\u662f Laurel Street\u3002\n<\/pre>\n<hr>\n<h2>\u901a\u8fc7\u53ef\u9009\u94fe\u63a5\u8c03\u7528\u6765\u8bbf\u95ee\u4e0b\u6807<\/h2>\n<p>\u901a\u8fc7\u53ef\u9009\u94fe\u63a5\u8c03\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u4e0b\u6807\u6765\u5bf9\u53ef\u9009\u503c\u8fdb\u884c\u8bfb\u53d6\u6216\u5199\u5165\uff0c\u5e76\u4e14\u5224\u65ad\u4e0b\u6807\u8c03\u7528\u662f\u5426\u6210\u529f\u3002<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<pre>\nclass Person {\n    var residence: Residence?\n}\n\n\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cf rooms\uff0c\u5b83\u88ab\u521d\u59cb\u5316\u4e3a\u4e00\u4e2aRoom[]\u7c7b\u578b\u7684\u7a7a\u6570\u7ec4\nclass Residence {\n    var rooms = [Room]()\n    var numberOfRooms: Int {\n        return rooms.count\n    }\n    subscript(i: Int) -&gt; Room {\n        return rooms[i]\n    }\n    func printNumberOfRooms() {\n        print(\"\u623f\u95f4\u53f7\u4e3a \\(numberOfRooms)\")\n    }\n    var address: Address?\n}\n\n\/\/ Room \u5b9a\u4e49\u4e00\u4e2aname\u5c5e\u6027\u548c\u4e00\u4e2a\u8bbe\u5b9aroom\u540d\u7684\u521d\u59cb\u5316\u5668\nclass Room {\n    let name: String\n    init(name: String) { self.name = name }\n}\n\n\/\/ \u6a21\u578b\u4e2d\u7684\u6700\u7ec8\u7c7b\u53eb\u505aAddress\nclass Address {\n    var buildingName: String?\n    var buildingNumber: String?\n    var street: String?\n    func buildingIdentifier() -&gt; String? {\n        if (buildingName != nil) {\n            return buildingName\n        } else if (buildingNumber != nil) {\n            return buildingNumber\n        } else {\n            return nil\n        }\n    }\n}\n\nlet john = Person()\n\nlet johnsHouse = Residence()\njohnsHouse.rooms.append(Room(name: \"\u5ba2\u5385\"))\njohnsHouse.rooms.append(Room(name: \"\u53a8\u623f\"))\njohn.residence = johnsHouse\n\nif let firstRoomName = john.residence?[0].name {\n    print(\"\u7b2c\u4e00\u4e2a\u623f\u95f4\u540d\u4e3a\\(firstRoomName)\")\n} else {\n    print(\"\u65e0\u6cd5\u68c0\u7d22\u5230\u623f\u95f4\")\n}\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n\u7b2c\u4e00\u4e2a\u623f\u95f4\u540d\u4e3a\u5ba2\u5385\n<\/pre>\n<hr>\n<h2>\u8bbf\u95ee\u53ef\u9009\u7c7b\u578b\u7684\u4e0b\u6807<\/h2>\n<p>\u5982\u679c\u4e0b\u6807\u8fd4\u56de\u53ef\u7a7a\u7c7b\u578b\u503c\uff0c\u6bd4\u5982Swift\u4e2dDictionary\u7684key\u4e0b\u6807\u3002\u53ef\u4ee5\u5728\u4e0b\u6807\u7684\u95ed\u5408\u62ec\u53f7\u540e\u9762\u653e\u4e00\u4e2a\u95ee\u53f7\u6765\u94fe\u63a5\u4e0b\u6807\u7684\u53ef\u7a7a\u8fd4\u56de\u503c\uff1a<\/p>\n<pre>\nvar testScores = [\"Dave\": [86, 82, 84], \"Bev\": [79, 94, 81]]\ntestScores[\"Dave\"]?[0] = 91\ntestScores[\"Bev\"]?[0]++\ntestScores[\"Brian\"]?[0] = 72\n\/\/ the \"Dave\" array is now [91, 82, 84] and the \"Bev\" array is now [80, 94, 81]\n<\/pre>\n<p>\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2atestScores\u6570\u7ec4\uff0c\u5305\u542b\u4e86\u4e24\u4e2a\u952e\u503c\u5bf9\uff0c \u628aString\u7c7b\u578b\u7684key\u6620\u5c04\u5230\u4e00\u4e2a\u6574\u5f62\u6570\u7ec4\u3002<\/p>\n<p>\u8fd9\u4e2a\u4f8b\u5b50\u7528\u53ef\u9009\u94fe\u63a5\u8c03\u7528\u628a&#8221;Dave&#8221;\u6570\u7ec4\u4e2d\u7b2c\u4e00\u4e2a\u5143\u7d20\u8bbe\u4e3a91\uff0c\u628a&#8221;Bev&#8221;\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20+1\uff0c\u7136\u540e\u5c1d\u8bd5\u628a&#8221;Brian&#8221;\u6570\u7ec4\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u8bbe\u4e3a72\u3002<\/p>\n<p>\u524d\u4e24\u4e2a\u8c03\u7528\u662f\u6210\u529f\u7684\uff0c\u56e0\u4e3a\u8fd9\u4e24\u4e2akey\u5b58\u5728\u3002\u4f46\u662fkey&#8221;Brian&#8221;\u5728\u5b57\u5178\u4e2d\u4e0d\u5b58\u5728\uff0c\u6240\u4ee5\u7b2c\u4e09\u4e2a\u8c03\u7528\u5931\u8d25\u3002\n<\/p>\n<hr>\n<h2>\u8fde\u63a5\u591a\u5c42\u94fe\u63a5<\/h2>\n<p>\u4f60\u53ef\u4ee5\u5c06\u591a\u5c42\u53ef\u9009\u94fe\u8fde\u63a5\u5728\u4e00\u8d77\uff0c\u53ef\u4ee5\u6398\u53d6\u6a21\u578b\u5185\u66f4\u4e0b\u5c42\u7684\u5c5e\u6027\u65b9\u6cd5\u548c\u4e0b\u6807\u811a\u672c\u3002\u7136\u800c\u591a\u5c42\u53ef\u9009\u94fe\u4e0d\u80fd\u518d\u6dfb\u52a0\u6bd4\u5df2\u7ecf\u8fd4\u56de\u7684\u53ef\u9009\u503c\u66f4\u591a\u7684\u5c42\u3002 <\/p>\n<p>\u5982\u679c\u4f60\u8bd5\u56fe\u901a\u8fc7\u53ef\u9009\u94fe\u83b7\u5f97Int\u503c\uff0c\u4e0d\u8bba\u4f7f\u7528\u4e86\u591a\u5c11\u5c42\u94fe\u63a5\u8fd4\u56de\u7684\u603b\u662fInt?\u3002 \u76f8\u4f3c\u7684\uff0c\u5982\u679c\u4f60\u8bd5\u56fe\u901a\u8fc7\u53ef\u9009\u94fe\u83b7\u5f97Int?\u503c\uff0c\u4e0d\u8bba\u4f7f\u7528\u4e86\u591a\u5c11\u5c42\u94fe\u63a5\u8fd4\u56de\u7684\u603b\u662fInt?\u3002<\/p>\n<h3>\u5b9e\u4f8b1<\/h3>\n<p>\u4e0b\u9762\u7684\u4f8b\u5b50\u8bd5\u56fe\u83b7\u53d6john\u7684residence\u5c5e\u6027\u91cc\u7684address\u7684street\u5c5e\u6027\u3002\u8fd9\u91cc\u4f7f\u7528\u4e86\u4e24\u5c42\u53ef\u9009\u94fe\u6765\u8054\u7cfbresidence\u548caddress\u5c5e\u6027\uff0c\u5b83\u4eec\u4e24\u8005\u90fd\u662f\u53ef\u9009\u7c7b\u578b\uff1a<\/p>\n<pre>\nclass Person {\n    var residence: Residence?\n}\n\n\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cf rooms\uff0c\u5b83\u88ab\u521d\u59cb\u5316\u4e3a\u4e00\u4e2aRoom[]\u7c7b\u578b\u7684\u7a7a\u6570\u7ec4\nclass Residence {\n    var rooms = [Room]()\n    var numberOfRooms: Int {\n        return rooms.count\n    }\n    subscript(i: Int) -&gt; Room {\n        return rooms[i]\n    }\n    func printNumberOfRooms() {\n        print(\"\u623f\u95f4\u53f7\u4e3a \\(numberOfRooms)\")\n    }\n    var address: Address?\n}\n\n\/\/ Room \u5b9a\u4e49\u4e00\u4e2aname\u5c5e\u6027\u548c\u4e00\u4e2a\u8bbe\u5b9aroom\u540d\u7684\u521d\u59cb\u5316\u5668\nclass Room {\n    let name: String\n    init(name: String) { self.name = name }\n}\n\n\/\/ \u6a21\u578b\u4e2d\u7684\u6700\u7ec8\u7c7b\u53eb\u505aAddress\nclass Address {\n    var buildingName: String?\n    var buildingNumber: String?\n    var street: String?\n    func buildingIdentifier() -&gt; String? {\n        if (buildingName != nil) {\n            return buildingName\n        } else if (buildingNumber != nil) {\n            return buildingNumber\n        } else {\n            return nil\n        }\n    }\n}\n\nlet john = Person()\n\nif let johnsStreet = john.residence?.address?.street {\n    print(\"John \u7684\u5730\u5740\u4e3a \\(johnsStreet).\")\n} else {\n    print(\"\u4e0d\u80fd\u68c0\u7d22\u5730\u5740\")\n}\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n\u4e0d\u80fd\u68c0\u7d22\u5730\u5740\n<\/pre>\n<h3>\u5b9e\u4f8b2<\/h3>\n<p>\u5982\u679c\u4f60\u4e3aAddress\u8bbe\u5b9a\u4e00\u4e2a\u5b9e\u4f8b\u6765\u4f5c\u4e3ajohn.residence.address\u7684\u503c\uff0c\u5e76\u4e3aaddress\u7684street\u5c5e\u6027\u8bbe\u5b9a\u4e00\u4e2a\u5b9e\u9645\u503c\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u591a\u5c42\u53ef\u9009\u94fe\u6765\u5f97\u5230\u8fd9\u4e2a\u5c5e\u6027\u503c\u3002<\/p>\n<pre>\nclass Person {\n   var residence: Residence?\n}\n\nclass Residence {\n    \n    var rooms = [Room]()\n    var numberOfRooms: Int {\n        return rooms.count\n    }\n    subscript(i: Int) -&gt; Room {\n        get{\n            return rooms[i]\n        }\n        set {\n            rooms[i] = newValue\n        }\n    }\n    func printNumberOfRooms() {\n        print(\"\u623f\u95f4\u53f7\u4e3a \\(numberOfRooms)\")\n    }\n    var address: Address?\n}\n\nclass Room {\n    let name: String\n    init(name: String) { self.name = name }\n}\n\nclass Address {\n    var buildingName: String?\n    var buildingNumber: String?\n    var street: String?\n    func buildingIdentifier() -&gt; String? {\n        if (buildingName != nil) {\n            return buildingName\n        } else if (buildingNumber != nil) {\n            return buildingNumber\n        } else {\n            return nil\n        }\n    }\n}\nlet john = Person()\njohn.residence?[0] = Room(name: \"\u6d74\u5ba4\")\n\nlet johnsHouse = Residence()\njohnsHouse.rooms.append(Room(name: \"\u5ba2\u5385\"))\njohnsHouse.rooms.append(Room(name: \"\u53a8\u623f\"))\njohn.residence = johnsHouse\n\nif let firstRoomName = john.residence?[0].name {\n    print(\"\u7b2c\u4e00\u4e2a\u623f\u95f4\u662f\\(firstRoomName)\")\n} else {\n    print(\"\u65e0\u6cd5\u68c0\u7d22\u623f\u95f4\")\n}\n<\/pre>\n<p>\u4ee5\u4e0a\u5b9e\u4f8b\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n\u7b2c\u4e00\u4e2a\u623f\u95f4\u662f\u5ba2\u5385\n<\/pre>\n<hr>\n<h2>\u5bf9\u8fd4\u56de\u53ef\u9009\u503c\u7684\u51fd\u6570\u8fdb\u884c\u94fe\u63a5<\/h2>\n<p>\u6211\u4eec\u8fd8\u53ef\u4ee5\u901a\u8fc7\u53ef\u9009\u94fe\u63a5\u6765\u8c03\u7528\u8fd4\u56de\u53ef\u7a7a\u503c\u7684\u65b9\u6cd5\uff0c\u5e76\u4e14\u53ef\u4ee5\u7ee7\u7eed\u5bf9\u53ef\u9009\u503c\u8fdb\u884c\u94fe\u63a5\u3002<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<pre>\nclass Person {\n    var residence: Residence?\n}\n\n\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cf rooms\uff0c\u5b83\u88ab\u521d\u59cb\u5316\u4e3a\u4e00\u4e2aRoom[]\u7c7b\u578b\u7684\u7a7a\u6570\u7ec4\nclass Residence {\n    var rooms = [Room]()\n    var numberOfRooms: Int {\n        return rooms.count\n    }\n    subscript(i: Int) -&gt; Room {\n        return rooms[i]\n    }\n    func printNumberOfRooms() {\n        print(\"\u623f\u95f4\u53f7\u4e3a \\(numberOfRooms)\")\n    }\n    var address: Address?\n}\n\n\/\/ Room \u5b9a\u4e49\u4e00\u4e2aname\u5c5e\u6027\u548c\u4e00\u4e2a\u8bbe\u5b9aroom\u540d\u7684\u521d\u59cb\u5316\u5668\nclass Room {\n    let name: String\n    init(name: String) { self.name = name }\n}\n\n\/\/ \u6a21\u578b\u4e2d\u7684\u6700\u7ec8\u7c7b\u53eb\u505aAddress\nclass Address {\n    var buildingName: String?\n    var buildingNumber: String?\n    var street: String?\n    func buildingIdentifier() -&gt; String? {\n        if (buildingName != nil) {\n            return buildingName\n        } else if (buildingNumber != nil) {\n            return buildingNumber\n        } else {\n            return nil\n        }\n    }\n}\n\nlet john = Person()\n\nif john.residence?.printNumberOfRooms() != nil {\n    print(\"\u6307\u5b9a\u4e86\u623f\u95f4\u53f7)\")\n}  else {\n    print(\"\u672a\u6307\u5b9a\u623f\u95f4\u53f7\")\n}\n<\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n<pre>\n\u672a\u6307\u5b9a\u623f\u95f4\u53f7\n<\/pre>\n<\/p><\/div>\n<\/p><\/div>\n<span>","protected":false},"excerpt":{"rendered":"<p class=\"excerpt\"><span itemprop=\"description\">Swift \u53ef\u9009\u94fe \u53ef\u9009\u94fe\uff08Optional Chaining\uff09\u662f\u4e00\u79cd\u53ef\u4ee5\u8bf7\u6c42\u548c\u8c03\u7528\u5c5e\u6027\u3001&hellip;<\/span><\/p>\n<p class=\"more-link-p btn-align-right\"><a class=\"green zoom-btn\" href=\"https:\/\/www.puzi7.net\/?p=545\">Read 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