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上传时间: 2013-07-23
详细说明： To program for iOS, you need some knowledge of the C programming language, for two reasons: • Most of your iOS programming will be in the Objective-C language, and Objective- C is a superset of C. This means that Objective-C presupposes C; everything that is true of C trickles up to Objective-C. A common mistake is to forget that “Objective-C is C” and to neglect a basic understanding of C. • Some of the iOS API involves C rather than Objective-C. Even in Objective-C code, you often need to use C data structures and C function c alls. For example, a rectangle is represented as a CGRect, which is a C struct, and to create a CGRect from four numbers you call CGRectMake, which is a C function. The iOS API documentation will very often show you C expressions and expect you to understand them. ...展开收缩
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