{"id":7722,"date":"2025-05-31T13:47:41","date_gmt":"2025-06-05T06:27:41","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=7722"},"modified":"2025-06-05T13:47:41","modified_gmt":"2025-06-05T06:27:41","slug":"https-badgameshow-com-steven-504","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/https-badgameshow-com-steven-504\/","title":{"rendered":"\u5728 SwiftUI \u4e2d\u4f7f\u7528 Picker\uff1a2025 \u6700\u65b0\u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"

<\/p>\n

\u5728 SwiftUI \u4e2d\u4f7f\u7528 Picker\uff1a2025 \u6700\u65b0\u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10<\/h1>\n

SwiftUI \u662f Apple \u5728 WWDC 2019 \u63a8\u51fa\u7684\u65b0\u6846\u67b6\uff0c\u5b83\u8b93\u958b\u767c\u8005\u80fd\u5920\u8f15\u9b06\u5efa\u7acb\u52d5\u614b\u4e14\u76f4\u89ba\u7684\u4f7f\u7528\u8005\u4ecb\u9762\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728 SwiftUI \u4e2d\u4f7f\u7528 Picker\uff0c\u4e26\u63d0\u4f9b\u6700\u65b0\u7684\u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10\uff0c\u5e6b\u52a9\u4f60\u63d0\u5347\u958b\u767c\u6548\u7387\u3002<\/p>\n

\u5982\u4f55\u5728 SwiftUI \u4e2d\u4f7f\u7528 Picker<\/h2>\n

\u5728 SwiftUI \u4e2d\uff0c\u4f7f\u7528 Picker \u53ef\u4ee5\u5feb\u901f\u5efa\u7acb\u4e00\u500b\u8b93\u4f7f\u7528\u8005\u9078\u64c7\u7684\u4ecb\u9762\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 Picker \u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n

struct ContentView: View {\n    @State private var selection: Int = 1\n\n    var body: some View {\n        Picker(\"\u9078\u64c7\u4e00\u500b\u9078\u9805\", selection: $selection) {\n            Text(\"\u9078\u9805 1\").tag(1)\n            Text(\"\u9078\u9805 2\").tag(2)\n            Text(\"\u9078\u9805 3\").tag(3)\n        }\n        .pickerStyle(SegmentedPickerStyle()) \/\/ \u4f7f\u7528\u5206\u6bb5\u9078\u64c7\u6a23\u5f0f\n        .padding()\n    }\n}\n<\/code><\/pre>\n
\u4e0a\u8ff0\u7a0b\u5f0f\u78bc\u4e2d\uff0c`selection` \u662f\u4e00\u500b `@State` \u5c6c\u6027\uff0c\u80fd\u5920\u8ffd\u8e64\u76ee\u524d\u9078\u64c7\u7684\u9078\u9805\u3002`label`\u5247\u662f\u7528\u4f86\u986f\u793a\u7d66\u4f7f\u7528\u8005\u7684\u63d0\u793a\uff0c\u8b93\u4ed6\u5011\u77e5\u9053\u6b63\u5728\u9078\u64c7\u7684\u5167\u5bb9\u3002<\/p>\n
\u5982\u4f55\u5728 SwiftUI \u4e2d\u4f7f\u7528 Picker \u4f86\u5efa\u7acb\u52d5\u614b\u4ecb\u9762<\/h2>\n
\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u6839\u64da\u8cc7\u6599\u52d5\u614b\u751f\u6210 Picker \u7684\u9078\u9805\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u7d50\u5408 `ForEach` \u4f86\u5be6\u73fe\u52d5\u614b Picker \u7684\u7bc4\u4f8b\uff1a<\/p>\n
struct ContentView: View {\n    @State private var selection: String = \"\u9078\u9805 1\"\n    let options = [\"\u9078\u9805 1\", \"\u9078\u9805 2\", \"\u9078\u9805 3\"]\n\n    var body: some View {\n        Picker(\"\u9078\u64c7\u4e00\u500b\u9078\u9805\", selection: $selection) {\n            ForEach(options, id: \\.self) { option in\n                Text(option).tag(option)\n            }\n        }\n        .pickerStyle(MenuPickerStyle()) \/\/ \u4f7f\u7528\u4e0b\u62c9\u9078\u55ae\u6a23\u5f0f\n        .padding()\n    }\n}\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u7a0b\u5f0f\u78bc\u4e2d\uff0c`options` \u9663\u5217\u63d0\u4f9b\u4e86\u9078\u9805\uff0c\u800c `ForEach` \u6703\u6839\u64da\u9019\u4e9b\u9078\u9805\u52d5\u614b\u751f\u6210 Picker \u7684\u5167\u5bb9\u3002<\/p>\n
\u932f\u8aa4\u6392\u9664<\/h2>\n
– **\u7121\u6cd5\u9078\u64c7\u9078\u9805**\uff1a\u8acb\u6aa2\u67e5 `selection` \u662f\u5426\u6b63\u78ba\u7d81\u5b9a\u3002\u78ba\u4fdd\u5b83\u662f `@State` \u6216 `@Binding` \u5c6c\u6027\u3002
\n– **\u4e0d\u986f\u793a\u9078\u9805**\uff1a\u78ba\u8a8d `ForEach` \u4e2d\u7684\u8cc7\u6599\u6e90\u662f\u5426\u6b63\u78ba\uff0c\u4e26\u4e14\u6bcf\u500b\u9078\u9805\u90fd\u6709\u552f\u4e00\u7684 `tag`\u3002<\/p>\n
\u5ef6\u4f38\u61c9\u7528<\/h2>\n
\u4f60\u53ef\u4ee5\u5c07 Picker \u8207\u5176\u4ed6 SwiftUI \u5143\u4ef6\u7d50\u5408\u4f7f\u7528\uff0c\u6bd4\u5982\u8207 TextField\u3001Button \u7b49\uff0c\u4f86\u5275\u5efa\u66f4\u8907\u96dc\u7684\u4ecb\u9762\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 Picker \u4f86\u9078\u64c7\u984f\u8272\uff0c\u7136\u5f8c\u6839\u64da\u9078\u64c7\u6539\u8b8a\u80cc\u666f\u984f\u8272\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u5728 SwiftUI \u4e2d\uff0c\u4f7f\u7528 Picker \u53ef\u4ee5\u8f15\u9b06\u5275\u5efa\u7528\u6236\u9078\u64c7\u4ecb\u9762\u3002\u7121\u8ad6\u662f\u975c\u614b\u9084\u662f\u52d5\u614b\u9078\u9805\uff0cPicker \u90fd\u63d0\u4f9b\u4e86\u7c21\u55ae\u6613\u7528\u7684 API\u3002\u8a18\u5f97\u4f7f\u7528\u6700\u65b0\u7684 SwiftUI \u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10\uff0c\u80fd\u5920\u8b93\u4f60\u7684\u61c9\u7528\u7a0b\u5f0f\u66f4\u5177\u5438\u5f15\u529b\u8207\u529f\u80fd\u6027\u3002<\/p>\n
Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n
Q1: Picker \u53ef\u4ee5\u81ea\u8a02\u6a23\u5f0f\u55ce\uff1f<\/h3>\n
A: \u662f\u7684\uff0cPicker \u652f\u63f4\u591a\u7a2e\u6a23\u5f0f\uff0c\u5982 `.segmented`, `.wheel`, \u548c `.menu`\uff0c\u4f60\u53ef\u4ee5\u6839\u64da\u9700\u6c42\u9078\u64c7\u9069\u5408\u7684\u6a23\u5f0f\u3002<\/p>\n
Q2: \u5982\u4f55\u5728 Picker \u4e2d\u8655\u7406\u9078\u9805\u8b8a\u66f4\uff1f<\/h3>\n
A: \u4f60\u53ef\u4ee5\u4f7f\u7528 `onChange(of:perform:)` \u4f86\u76e3\u807d\u9078\u9805\u8b8a\u66f4\uff0c\u4e26\u57f7\u884c\u76f8\u61c9\u7684\u64cd\u4f5c\u3002<\/p>\n
Q3: Picker \u652f\u63f4\u591a\u9078\u55ce\uff1f<\/h3>\n
A: Picker \u672c\u8eab\u50c5\u652f\u63f4\u55ae\u9078\uff0c\u5982\u679c\u9700\u8981\u591a\u9078\u529f\u80fd\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 List \u642d\u914d Toggle \u6216 CheckBox \u4f86\u5be6\u73fe\u3002<\/h3>\n
\"\u5728
\n—<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6458\u8981:\u5728SwiftUI\u4e2d\uff0cPicker\u662f\u4e00\u500b\u53ef\u4ee5\u8b93\u4f60\u5728\u4f7f\u7528\u8005\u4ecb\u9762\u4e2d\u9078\u64c7\u4e00\u500b\u6216\u591a\u500b\u9078\u9805\u7684\u63a7\u5236\u5143\u4ef6\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728SwiftUI\u4e2d\u4f7f\u7528Picker\u4ee5\u53ca\u5982\u4f55\u81ea\u8a02Picker\u7684\u5916\u89c0\u548c\u884c\u70ba\u3002<\/p>\n","protected":false},"author":1,"featured_media":7721,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[174,5],"tags":[173,9],"class_list":["post-7722","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ios","category-swift","tag-ios","tag-swift"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/badgameshow.com\/steven\/wp-content\/uploads\/2023\/02\/\u5728-SwiftUI-\u4e2d\u4f7f\u7528-Picker_1676961723.245208.webp","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-20y","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/7722","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=7722"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/7722\/revisions"}],"predecessor-version":[{"id":13171,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/7722\/revisions\/13171"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media\/7721"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=7722"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=7722"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=7722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}