{"id":361,"date":"2025-06-02T11:17:25","date_gmt":"2025-06-05T03:21:25","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=361"},"modified":"2025-06-05T11:17:25","modified_gmt":"2025-06-05T03:21:25","slug":"swift-%e8%88%87-oc-%e7%9a%84%e8%ae%8a%e6%95%b8%e5%b7%ae%e7%95%b0","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/swift-%e8%88%87-oc-%e7%9a%84%e8%ae%8a%e6%95%b8%e5%b7%ae%e7%95%b0\/","title":{"rendered":"Swift \u8207 Objective-C \u7684\u8b8a\u6578\u5dee\u7570\uff1a2025 \u6700\u65b0\u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"

Swift \u8207 Objective-C \u7684\u8b8a\u6578\u5dee\u7570<\/h1>\n

\u7269\u4ef6\u90e8\u5206<\/h2>\n

Objective-C<\/h3>\n
@property (weak, nonatomic) IBOutlet UIButton *addBtn;\n@property (weak, nonatomic) IBOutlet UILabel *dataLabel;\n@property (weak, nonatomic) IBOutlet UITableView *shipTableView;<\/code><\/pre>\n
\u5728 Objective-C \u4e2d\uff0c\u6211\u5011\u4f7f\u7528 `@property` \u5ba3\u544a\u8b8a\u6578\uff0c\u4e26\u6307\u5b9a\u5176\u5c6c\u6027\uff0c\u4f8b\u5982 `weak` \u548c `nonatomic`\u3002<\/p>\n
Swift<\/h3>\n
@IBOutlet weak var addBtn: UIButton!\n@IBOutlet weak var dataLabel: UILabel!\n@IBOutlet weak var shipTableView: UITableView!<\/code><\/pre>\n
\u5728 Swift \u4e2d\uff0c\u8b8a\u6578\u7684\u5ba3\u544a\u4f7f\u7528 `@IBOutlet`\uff0c\u4e26\u4ee5 `weak` \u4f5c\u70ba\u53c3\u8003\u4fee\u98fe\u7b26\u3002\u9019\u4f7f\u5f97 Swift \u7684\u8a9e\u6cd5\u66f4\u70ba\u7c21\u6f54\uff0c\u4e14\u4e0d\u6613\u51fa\u73fe\u8a18\u61b6\u9ad4\u6d29\u6f0f\u7684\u554f\u984c\u3002<\/p>\n
\u8b8a\u6578\u8207\u5e38\u6578\u7684\u4f7f\u7528 (var\/let)<\/h3>\n
\u5728 Swift \u4e2d\uff0c\u4f7f\u7528 var<\/code> \u548c let<\/code> \u4f86\u5ba3\u544a\u8b8a\u6578\u8207\u5e38\u6578\u3002var<\/code> \u7528\u65bc\u53ef\u8b8a\u7684\u8b8a\u6578\uff0c\u800c let<\/code> \u5247\u7528\u65bc\u4e0d\u6703\u6539\u8b8a\u7684\u5e38\u6578\u3002<\/p>\n
\u9019\u8207 Objective-C \u4e2d\u7684 `NSMutableArray` \u548c `NSArray` \u76f8\u4f3c\uff1a`NSMutableArray` \u662f\u53ef\u8b8a\u7684\uff0c\u76f8\u7576\u65bc Swift \u7684 var<\/code>\uff0c\u800c `NSArray` \u662f\u56fa\u5b9a\u7684\uff0c\u76f8\u7576\u65bc let<\/code>\u3002<\/p>\n
\u5f37\u5236\u89e3\u5305\u8207\u53ef\u9078\u503c (! \u548c ?)<\/h3>\n
var testStr: String?\ntestStr = \"\u6e2c\u8a66\"\nprint(testStr!)<\/code><\/pre>\n
\u5728 Swift \u4e2d\uff0c!<\/code> \u7b26\u865f\u4ee3\u8868\u5f37\u5236\u89e3\u5305<\/strong>\uff0c\u7576\u8b8a\u6578\u672a\u8ce6\u503c\u6642\uff0c\u4f7f\u7528 !<\/code> \u6703\u5c0e\u81f4\u7a0b\u5f0f\u5d29\u6f70\u3002\u70ba\u4e86\u907f\u514d\u9019\u7a2e\u60c5\u6cc1\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 ??<\/code> \u9032\u884c\u9810\u8a2d\u503c\u8a2d\u5b9a\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
let safeStr = testStr ?? \"\u9810\u8a2d\u503c\"<\/code><\/pre>\n
\u800c ?<\/code> \u7b26\u865f\u5247\u8868\u793a\u53ef\u9078\u503c<\/strong>\uff0c\u9019\u8868\u793a\u8b8a\u6578\u53ef\u4ee5\u662f nil\uff0c\u4e0d\u6703\u5c0e\u81f4\u7a0b\u5f0f\u5d29\u6f70\u3002<\/p>\n
\n
\u4ee5\u4e0b\u662f\u793a\u610f\u5716\uff0c\u5c55\u793a Swift \u8207 Objective-C \u7684\u8b8a\u6578\u5ba3\u544a\u65b9\u5f0f\u3002<\/p>\n
\"Swift<\/a><\/p>\n
\u7d50\u8ad6<\/h2>\n
\u5728 Swift \u7684\u958b\u767c\u4e2d\uff0c\u7406\u89e3\u8b8a\u6578\u8207\u5e38\u6578\u7684\u5dee\u7570\u4ee5\u53ca\u5982\u4f55\u6b63\u78ba\u4f7f\u7528\u53ef\u9078\u503c\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u9019\u4e0d\u50c5\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u64b0\u5beb\u66f4\u5b89\u5168\u7684\u7a0b\u5f0f\u78bc\uff0c\u4e5f\u80fd\u63d0\u5347\u61c9\u7528\u7a0b\u5f0f\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n
Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n
Q1: Swift \u4e2d\u4ec0\u9ebc\u662f\u53ef\u9078\u503c\uff1f<\/h3>\n
A1: \u53ef\u9078\u503c\u662f Swift \u4e2d\u7684\u4e00\u7a2e\u8cc7\u6599\u578b\u5225\uff0c\u7528\u65bc\u8868\u793a\u8b8a\u6578\u53ef\u4ee5\u662f\u67d0\u500b\u503c\u6216\u662f nil\uff0c\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u5d29\u6f70\u3002<\/p>\n
Q2: \u5982\u4f55\u5728 Swift \u4e2d\u8655\u7406 nil \u503c\uff1f<\/h3>\n
A2: \u53ef\u4ee5\u4f7f\u7528 if let<\/code> \u4f86\u5b89\u5168\u5730\u89e3\u5305\u53ef\u9078\u503c\uff0c\u6216\u8005\u4f7f\u7528 ??<\/code> \u4f86\u8a2d\u5b9a\u9810\u8a2d\u503c\u3002<\/p>\n
Q3: \u70ba\u4ec0\u9ebc\u8981\u4f7f\u7528 let<\/code> \u4f86\u5ba3\u544a\u5e38\u6578\uff1f<\/h3>\n
A3: \u4f7f\u7528 let<\/code> \u5ba3\u544a\u5e38\u6578\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5f0f\u7684\u53ef\u8b80\u6027\u548c\u5b89\u5168\u6027\uff0c\u78ba\u4fdd\u5728\u7a0b\u5f0f\u57f7\u884c\u904e\u7a0b\u4e2d\u8b8a\u6578\u4e0d\u6703\u610f\u5916\u88ab\u4fee\u6539\u3002<\/p>\n
—<\/p>\n","protected":false},"excerpt":{"rendered":"
var testStr:String?
\ntestStr = “\u6e2c\u8a66”
\nprint(testStr!)<\/p>\n","protected":false},"author":1,"featured_media":559,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5],"tags":[],"class_list":["post-361","post","type-post","status-publish","format-aside","has-post-thumbnail","hentry","category-swift","post_format-post-format-aside"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/badgameshow.com\/steven\/wp-content\/uploads\/2020\/11\/cup-1-1.png","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-5P","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/361","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=361"}],"version-history":[{"count":3,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/361\/revisions"}],"predecessor-version":[{"id":592,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/361\/revisions\/592"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media\/559"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=361"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=361"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}