{"id":654,"date":"2020-08-14T17:40:38","date_gmt":"2020-08-14T09:40:38","guid":{"rendered":"http:\/\/123.57.164.21\/?p=654"},"modified":"2020-08-14T17:40:38","modified_gmt":"2020-08-14T09:40:38","slug":"swiftui-%e8%87%aa%e5%ae%9a%e4%b9%89modifier","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=654","title":{"rendered":"SwiftUI \u81ea\u5b9a\u4e49Modifier"},"content":{"rendered":"\n<p>\u5728SwiftUI\u4e2d\uff0c\u53ef\u4ee5\u81ea\u5b9a\u4e49\u81ea\u5df1\u7684Modifier\u3002\u5f53\u5f88\u591a View \u6709\u5171\u6027\u7684 Modifier \uff0c\u5982\u5171\u540c\u7684background color\uff0cpadding\uff0cfont \u7b49\uff0c\u6b64\u65f6\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49 Modifier \u8fdb\u884c\u5c01\u88c5\uff0c\u907f\u514d\u91cd\u590d\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\u5982\u679c\u81ea\u5b9a\u4e49Modifier\u5462\uff1f<\/p>\n\n\n\n<ul><li>\u65b0\u5efa\u4e00\u4e2a\u7ed3\u6784\u4f53\u5b9e\u73b0 ViewModifier \u534f\u8bae\u3002<\/li><li>\u5b9e\u73b0 body(content:) \u65b9\u6cd5\u3002<\/li><li>\u7136\u540e\u5c06\u9700\u8981\u7684 Modifier \u4fee\u9970\u5230 content \u53c2\u6570\u4e0a\u3002<\/li><\/ul>\n\n\n\n<p><strong>\u5b9a\u4e49Modifier\u7684\u4f8b\u5b50<\/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=\"\">\nstruct ClearButton: ViewModifier {\n    @Binding var text: String\n\n    public func body(content: Content) -> some View {\n        HStack {\n            content\n            Button(action: {\n                self.text = \"\"\n            }) {\n                if self.text != \"\" {\n                    Image(systemName: \"multiply.circle.fill\")\n                        .foregroundColor(.secondary)\n                }\n            }\n        }\n    }\n}\n\nstruct hiddenView: ViewModifier {\n\n    @Binding var isHidden: Bool\n    public func body(content: Content) -> some View {\n        Group {\n            if !isHidden {\n                content.hidden()\n            } else {\n                content\n            }\n        }\n    }\n}\n<\/pre>\n\n\n\n<p><strong>\u4f7f\u7528Modifier\u7684\u4f8b\u5b50<\/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=\"\">TextField(\"\", text: self.$inputText).keyboardType(.asciiCapable).textFieldStyle(RoundedBorderTextFieldStyle()).modifier(ClearButton(text: self.$inputText))<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5728SwiftUI\u4e2d\uff0c\u53ef\u4ee5\u81ea\u5b9a\u4e49\u81ea\u5df1\u7684Modifier\u3002\u5f53\u5f88\u591a View \u6709\u5171\u6027\u7684 Modifier \uff0c\u5982\u5171\u540c\u7684 [&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\/654"}],"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=654"}],"version-history":[{"count":2,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/654\/revisions"}],"predecessor-version":[{"id":656,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/654\/revisions\/656"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}