{"id":1258,"date":"2020-11-26T10:32:00","date_gmt":"2020-11-26T02:32:00","guid":{"rendered":"http:\/\/123.57.164.21\/?p=1258"},"modified":"2020-11-26T10:51:07","modified_gmt":"2020-11-26T02:51:07","slug":"swiftui-%e7%94%9f%e6%88%90%e5%92%8c%e7%bc%a9%e6%94%be%e4%ba%8c%e7%bb%b4%e7%a0%81","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=1258","title":{"rendered":"SwiftUI \u751f\u6210\u548c\u7f29\u653e\u4e8c\u7ef4\u7801"},"content":{"rendered":"\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/\n\/\/  ContentView.swift\n\/\/  ORCode\n\/\/\n\/\/\n\nimport SwiftUI\nimport CoreImage.CIFilterBuiltins\n\n\nstruct ContentView: View {\n    var body: some View {\n        Image(uiImage: generateQRCode(from: \"123\")).interpolation(.none)\n            .resizable()\n            .scaledToFit()\n            .frame(width: 100, height: 100)\n            .padding()\n    }\n    \n    func generateQRCode(from string: String) -> UIImage {\n        let context = CIContext()\n        let filter = CIFilter.qrCodeGenerator()\n        let data = Data(string.utf8)\n        filter.setValue(data, forKey: \"inputMessage\")\n\n        if let outputImage = filter.outputImage {\n            if let cgimg = context.createCGImage(outputImage, from: outputImage.extent) {\n                return UIImage(cgImage: cgimg)\n            }\n        }\n\n        return UIImage(systemName: \"xmark.circle\") ?? UIImage()\n    }\n}\n\nstruct ContentView_Previews: PreviewProvider {\n    static var previews: some View {\n        ContentView()\n    }\n}\n<\/pre>\n\n\n\n<p><strong>\u751f\u6210\u548c\u7f29\u653e\u4e8c\u7ef4\u7801<\/strong><\/p>\n\n\n\n<p>Core Image \u53ef\u4ee5\u8ba9\u6211\u4eec\u57fa\u4e8e\u4efb\u4f55\u5b57\u7b26\u4e32\u8f93\u5165\u751f\u6210\u4e00\u4e2a\u4e8c\u7ef4\u7801\uff0c\u800c\u4e14\u8fc7\u7a0b\u6781\u5feb\u3002\u4e0d\u8fc7\uff0c\u8fd9\u91cc\u6709\u4e00\u4e2a\u95ee\u9898\uff1a\u56fe\u50cf\u7684\u5c3a\u5bf8\u5f88\u5c0f\uff0c\u53ea\u5305\u542b\u627f\u8f7d\u6570\u636e\u5fc5\u8981\u7684\u50cf\u7d20\u3002\u8981\u8ba9\u4e8c\u7ef4\u7801\u66f4\u597d\u7528\uff0c\u9700\u8981\u501f\u52a9 SwiftUI \u7684\u56fe\u50cf\u63d2\u503c\u3002\u56e0\u6b64\uff0c\u5728\u8fd9\u4e00\u6b65\u6211\u4eec\u8981\u8ba9\u7528\u6237\u5728\u8868\u5355\u91cc\u8f93\u5165\u4ed6\u4eec\u7684\u540d\u5b57\u548c\u90ae\u4ef6\u5730\u5740\uff0c\u7136\u540e\u7528\u8fd9\u4e24\u6761\u4fe1\u606f\u751f\u6210\u4e00\u4e2a\u80fd\u6807\u8bc6\u4ed6\u4eec\u7684\u4e8c\u7ef4\u7801\uff0c\u5e76\u4e14\u653e\u5927\u8fd9\u4e2a\u4e8c\u7ef4\u7801\u3002<\/p>\n\n\n\n<p>\u4e8c\u7ef4\u7801\u662f\u4e00\u5757\u7531\u9ed1\u767d\u50cf\u7d20\u6784\u6210\u7684\u65b9\u5757\uff0c\u53ef\u4ee5\u901a\u8fc7\u624b\u673a\u548c\u5176\u4ed6\u8bbe\u5907\u6765\u626b\u63cf\u3002Core Image \u5bf9\u6b64\u63d0\u4f9b\u4e86\u4e13\u95e8\u7684\u6ee4\u955c\u3002\u5982\u679c\u4f60\u4e4b\u524d\u5b66\u4e60\u8fc7\u5982\u4f55\u4f7f\u7528 Core Image \u6ee4\u955c\uff0c\u4f60\u4f1a\u53d1\u73b0\u4e0b\u9762\u7684\u8fc7\u7a0b\u5f88\u76f8\u4f3c\u3002<\/p>\n\n\n\n<p><strong>\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u7528\u4e00\u4e2a\u65b0\u7684\u00a0<code>import<\/code>\u00a0\u6765\u5bfc\u5165 Core Image \u5185\u7f6e\u7684\u6ee4\u955c\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import CoreImage.CIFilterBuiltins\n<\/pre>\n\n\n\n<p>\u5176\u6b21\uff0c\u6211\u4eec\u8981\u7528\u4e24\u4e2a\u5c5e\u6027\u6765\u5206\u522b\u5b58\u50a8\u4e00\u4e2a\u6fc0\u6d3b\u7684 Core Image \u4e0a\u4e0b\u6587\u548c\u4e00\u4e2a Core Image \u7684\u4e8c\u7ef4\u7801\u751f\u6210\u5668\u6ee4\u955c\u7684\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">let context = CIContext()&lt;br>let filter = CIFilter.qrCodeGenerator()\n<\/pre>\n\n\n\n<p>\u63a5\u4e0b\u6765\u662f\u6709\u8da3\u7684\u90e8\u5206\uff1a\u5236\u4f5c\u4e8c\u7ef4\u7801\u3002\u5982\u679c\u4f60\u8fd8\u8bb0\u5f97\uff0cCore Image \u6ee4\u955c\u8981\u6c42\u6211\u4eec\u4f7f\u7528\u00a0<code>setValue(_:forKey:)<\/code>\u00a0\u6765\u8bbe\u7f6e\u8f93\u5165\u6570\u636e\uff0c\u7136\u540e\u628a\u8f93\u51fa\u7684\u00a0<code>CIImage<\/code>\u00a0\u8f6c\u6210\u00a0<code>CGImage<\/code>\uff0c\u518d\u628a\u00a0<code>CGImage<\/code>\u00a0\u8f6c\u6210\u00a0<code>UIImage<\/code>\u3002\u8fd9\u91cc\u7684\u6b65\u9aa4\u76f8\u4f3c\uff0c\u9664\u4e86\u4ee5\u4e0b\u4e09\u70b9\uff1a<\/p>\n\n\n\n<ul><li>\u6211\u4eec\u7684\u8f93\u5165\u662f\u5b57\u7b26\u4e32\uff0c\u4f46\u6ee4\u955c\u7684\u8f93\u5165\u662f\u00a0<code>Data<\/code>\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u505a\u8f6c\u6362\u3002<\/li><li>\u5982\u679c\u8f6c\u6362\u56e0\u4e3a\u67d0\u79cd\u539f\u56e0\u5931\u8d25\uff0c\u6211\u4eec\u4f1a\u8fd4\u56de SF Symbols \u7684 \u201cxmark.circle\u201d \u56fe\u50cf\u3002<\/li><li>\u5982\u679c\u8be5\u56fe\u50cf\u4e0d\u80fd\u8bfb\u53d6 \u2014\u2014 \u7406\u8bba\u4e0a\u8fd9\u662f\u6709\u53ef\u80fd\u7684\uff0c\u56e0\u4e3a SF Symbols \u662f\u57fa\u4e8e\u5b57\u7b26\u4e32\u7684 \u2014\u2014 \u90a3\u4e48\u6211\u4eec\u5c06\u8fd4\u56de\u4e00\u4e2a\u7a7a\u7684\u00a0<code>UIImage<\/code>\u3002<\/li><\/ul>\n\n\n\n<p>\u628a\u4e0b\u9762\u8fd9\u4e2a\u65b9\u6cd5\u6dfb\u52a0\u5230\u00a0\u7ed3\u6784\u4f53\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">func generateQRCode(from string: String) -> UIImage {\n    let data = Data(string.utf8)\n    filter.setValue(data, forKey: \"inputMessage\")\n\n    if let outputImage = filter.outputImage {\n        if let cgimg = context.createCGImage(outputImage, from: outputImage.extent) {\n            return UIImage(cgImage: cgimg)\n        }\n    }\n\n    return UIImage(systemName: \"xmark.circle\") ?? UIImage()\n}\n<\/pre>\n\n\n\n<p>\u5728 SwiftUI \u4e2d\uff0c\u901a\u8fc7\u51fd\u6570\u5206\u79bb\u529f\u80fd\u7684\u505a\u6cd5\u5f88\u594f\u6548\uff0c\u56e0\u4e3a\u8fd9\u610f\u5473\u7740\u6211\u4eec\u653e\u8fdb\u00a0<code>body<\/code>\u00a0\u5c5e\u6027\u7684\u4ee3\u7801\u5c06\u4f1a\u5c3d\u53ef\u80fd\u5730\u7b80\u5355\u3002\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u00a0<code>generateQRCode(from:)<\/code>\u00a0\u751f\u6210\u7684\u00a0<code>Image<\/code>\uff0c\u7136\u540e\u628a\u5b83\u653e\u5927\u5230\u4e00\u4e2a\u5408\u7406\u7684\u5c3a\u5bf8\u00a0.<\/p>\n\n\n\n<p>\u628a\u8fd9\u4e2a\u65b0\u00a0<code>Image<\/code>\u00a0\u89c6\u56fe\u76f4\u63a5\u6dfb\u52a0\u5230\u00a0<code>\u89c6\u56fe\u4e0a\u9762<\/code><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Image(uiImage: generateQRCode(from: \"\\(name)\\n\\(emailAddress)\"))\n    .resizable()\n    .scaledToFit()\n    .frame(width: 200, height: 200)\n<\/pre>\n\n\n\n<p>\u4e0d\u8fc7\uff0c\u8fd1\u8ddd\u79bb\u89c2\u5bdf\u4e00\u4e0b\u4e8c\u7ef4\u7801 \u2014\u2014 \u4f60\u6ce8\u610f\u5230\u5b83\u662f\u6a21\u7cca\u7684\u5417\uff1f\u8fd9\u662f\u56e0\u4e3a Core Image \u751f\u6210\u7684\u662f\u5c0f\u56fe\u50cf\uff0c\u800c SwiftUI \u5728\u653e\u5927\u65f6\u5c1d\u8bd5\u5e73\u6ed1\u50cf\u7d20\u3002<\/p>\n\n\n\n<p>\u50cf\u4e8c\u7ef4\u7801\u8fd9\u6837\u7684\u7ebf\u6761\u827a\u672f\uff0c\u6700\u597d\u662f\u7981\u7528\u56fe\u50cf\u63d2\u503c\uff0c\u628a\u4e0b\u9762\u8fd9\u4e2a modifier \u6dfb\u52a0\u5230\u56fe\u50cf\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">.interpolation(.none)\n\n<\/pre>\n\n\n\n<p>\u8fd9\u6837\u4e8c\u7ef4\u7801\u5c31\u4f1a\u4ee5\u6bd4\u8f83\u9510\u5229\u7684\u65b9\u5f0f\u6e32\u67d3\uff0c\u56e0\u4e3a SwiftUI \u53ea\u4f1a\u590d\u5236\u50cf\u7d20\u800c\u4e0d\u4f1a\u6df7\u5408\u50cf\u7d20\u3002\u5bf9\u4e8e\u76f8\u673a\u6765\u8bf4\uff0c\u5b83\u4e0d\u5173\u5fc3\u4e8c\u7ef4\u7801\u957f\u5565\u6837\uff0c\u4f46\u8fd9\u6837\u5bf9\u7528\u6237\u6765\u8bf4\u6bd4\u8f83\u597d\u770b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u751f\u6210\u548c\u7f29\u653e\u4e8c\u7ef4\u7801 Core Image \u53ef\u4ee5\u8ba9\u6211\u4eec\u57fa\u4e8e\u4efb\u4f55\u5b57\u7b26\u4e32\u8f93\u5165\u751f\u6210\u4e00\u4e2a\u4e8c\u7ef4\u7801\uff0c\u800c\u4e14\u8fc7\u7a0b\u6781\u5feb\u3002\u4e0d\u8fc7\uff0c\u8fd9\u91cc\u6709 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/1258"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1258"}],"version-history":[{"count":2,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/1258\/revisions"}],"predecessor-version":[{"id":1261,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/1258\/revisions\/1261"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1258"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}