\ud83d\udc49\ud83c\udffb \ud074\ub85c\uc800\uc758 \uc758\ubbf8 \/ Meaning of closure<\/p>\n\n\n\n
\u2714\ufe0f \ucf54\ub4dc \ube14\ub85d \uadf8 \uc790\uccb4\ub97c \ubcc0\uc218\ucc98\ub7fc \uc804\ub2ec\ud558\uac70\ub098 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 “\uc774\ub984 \uc5c6\ub294 \ud568\uc218”\ub77c\uace0 \uc774\ud574\ud558\uba74\ub429\ub2c8\ub2e4. You can think of it as an “unnamed function” where the code block itself can be passed or used like a variable.<\/p>\n\n\n\n
\ud83d\udc49\ud83c\udffb \ud074\ub85c\uc800\uc758 \uae30\ubcf8\ud615\uc2dd \/ Basic format of closure<\/p>\n\n\n\n
— Swift\uc5d0\uc11c \ud568\uc218\uc758 \ub9c8\uc9c0\ub9c9 \uc778\uc790\uac00 \ud074\ub85c\uc800(\ud568\uc218 \ube14\ub85d)\uc77c \ub54c, \uadf8 \ud074\ub85c\uc800\ub97c \uc18c\uad04\ud638\u00a0()<\/code>\u00a0\ubc14\uae65\uc73c\ub85c \ube7c\ub0b4\uc5b4 \uc911\uad04\ud638\u00a0{}<\/code>\ub85c \uc791\uc131\ud560 \uc218 \uc788\uac8c \ud574\uc8fc\ub294 \ubb38\ubc95\uc785\ub2c8\ub2e4. In Swift, when the last argument of a function is a closure (function block), this is a syntax that allows you to take the closure out of the parentheses () and write it in curly brackets {}.<\/p>\n\n\n\n
— \uc77c\ubc18\uc801\uc778\ud615\ud0dc \/ general form<\/p>\n\n\n\n
— \ud074\ub85c\uc800\ub97c \ubcc0\uc218\uc5d0 \uc800\uc7a5\ud574\uc11c \ud638\ucd9c\ud558\uba74 \ud074\ub85c\uc800 \ub0b4\ubd80\uc758 \ubcc0\uc218\ub294 \uacc4\uc18d \uae30\uc5b5\ub429\ub2c8\ub2e4.(\ud074\ub85c\uc800 \ucea1\ucdb0) When you call a closure by saving it in a variable, the variables inside the closure are remembered. (Closure capture)<\/p>\n\n\n\n
init() {\n \/\/ \ucd08\uae30\ud654 \uc2dc\uc810\uc5d0 2\uc529 \uc99d\uac00\ud558\ub294 \ud074\ub85c\uc800\ub97c \uc0dd\uc131\ud558\uc5ec \ud560\ub2f9\n \/\/ \ucd08\uae30\ud654 \ubc84\ud2bc \ud0ed\ud558\uae30 \uc804\uae4c\uc9c0 \uc791\ub3d9\n \n \/\/ Create and assign a closure that increments by 2 at initialization time. \/\/ Works until the initialization button is pressed.\n _incrementByTwo = State(initialValue: {\n var total = 0\n return {\n total += 2\n return total\n }\n }())\n }<\/code><\/pre>\n\n\n\n
— \ud074\ub85c\uc800 \ud568\uc218 \ud638\ucd9c : incrementByTwo()\ub97c \uc2e4\ud589\ud558\uba74 total\ud568\uc218\uc758 \uac12\uc774 \uacc4\uc18d \ub204\uc801\ub429\ub2c8\ub2e4. Calling the closure function: When incrementByTwo() is executed, the value of the total function continues to accumulate.<\/p>\n\n\n\n
Button(action: {\n \/\/ \ud604\uc7ac \ud560\ub2f9\ub41c \ud074\ub85c\uc800\ub97c \uc2e4\ud589\ud558\uc5ec UI \uc5c5\ub370\uc774\ud2b8\n \/\/ Update the UI by executing the currently assigned closure\n message2 = String(incrementByTwo())\n }) {\n Text(\"\uac12 \ubcc0\uacbd \/ change value (+2)\")\n .padding()\n .background(Color.green)\n .foregroundStyle(.white)\n .cornerRadius(10)\n }<\/code><\/pre>\n\n\n\n
\u2b50\ufe0f\uc774 \ubd80\ubd84\uc5d0\uc11c @State\ub85c \uc120\uc5b8\ub41c incrementByTwo\ub97c \ucd08\uae30\ud654 \ud558\uba70 \uc544\ub798\ub294 \uc6b0\ub9ac\uac00 \uc0ac\uc6a9\ud558\ub294 \ucf54\ub4dc\uc640 \ucef4\ud30c\uc77c\ub7ec\uac00 \uc5b4\ub5bb\uac8c \ud574\uc11d\ud558\ub294\uc9c0\ub97c \ubcf4\uc5ec\uc8fc\ub294 \ucf54\ub4dc \uc785\ub2c8\ub2e4. In this part, we initialize incrementByTwo declared with @State, and below is the code that we use and how the compiler interprets it.<\/p>\n\n\n\n
\ud83d\udc49\ud83c\udffb \ud074\ub85c\uc800\uc758 \uc758\ubbf8 \/ Meaning of closure \u2714\ufe0f \ucf54\ub4dc \ube14\ub85d \uadf8 \uc790\uccb4\ub97c \ubcc0\uc218\ucc98\ub7fc \uc804\ub2ec\ud558\uac70\ub098 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 “\uc774\ub984 \uc5c6\ub294 \ud568\uc218”\ub77c\uace0 \uc774\ud574\ud558\uba74\ub429\ub2c8\ub2e4.You can think of it as an “unnamed function” where the code block itself can be passed or used like a variable. \ud83d\udc49\ud83c\udffb \ud074\ub85c\uc800\uc758 \uae30\ubcf8\ud615\uc2dd \/ Basic format of closure \ud83d\udc49\ud83c\udffb \uc544\ub798 \ucf54\ub4dc\uc5d0\uc11c \ud074\ub85c\uc800\uc758 \uc0ac\uc6a9 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19,1],"tags":[],"class_list":["post-4076","post","type-post","status-publish","format-standard","hentry","category-swift","category-uncategorized","missing-thumbnail"],"_links":{"self":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/4076","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=4076"}],"version-history":[{"count":29,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/4076\/revisions"}],"predecessor-version":[{"id":4106,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/4076\/revisions\/4106"}],"wp:attachment":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=4076"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=4076"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=4076"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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