"Learning Swift from scratch" study notes (Day)--swift and objective-c mixed programming language

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in the Swift before the advent of language, development IOS or OS X Application Main Use objective-c language, you can also use C and the C + + language, but UI parts can only be used objective-c language.

Select language

Swift after the advent of the language, Apple gives programmers more options to coexist in both languages. Since they coexist, there are 4 ways we can choose:

• with pure Swift 's reformist approach;

• with pure Objective-c 's conservative approach;

• Adopt Swift calls objective-c 's left-leaning reformists mode;

• Adopt Objective-c calls Swift 's right-leaning reformists mode.

File name extension

in the Xcode and other tools development IOS or OS X applications can write multiple forms of source files that can be used objective-c , C and the C + + language, Swift The format of the source files is more diverse when the language appears. Potential file extension descriptions:

650) this.width=650; "Width=" "height=" 205 "title=" day69-1.jpg "style=" width:600px;height:205px; "src="/HTTP/ S1.51cto.com/wyfs02/m02/7d/13/wkiom1bfvvoy7isfaailyyxwcke072.jpg "border=" 0 "vspace=" 0 "hspace=" 0 "alt=" Wkiom1bfvvoy7isfaailyyxwcke072.jpg "/>

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650) this.width=650; "Width=" "height=" "title=" Qrcode_for_gh_ca9759a5ef7f_258.jpg "style=" width:150px;height : 150px; "src=" http://s2.51cto.com/wyfs02/M00/7D/12/wKioL1bfveqCxRIuAADC6S3kNXs606.jpg "border=" 0 "vspace=" 0 " Hspace= "0" alt= "wkiol1bfveqcxriuaadc6s3knxs606.jpg"/>
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"Learning Swift from scratch" study notes (Day)--swift and objective-c mixed programming language