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日期:2025-04-25
為了有別於C 語言的字串,因此NSString 字串物件的常數形式為@"" ,多了@ 符號
... 表示指標(pointer) , Objective-C 中凡是指向物件的變數(variable) 都必須用指標
......
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日期:2025-04-29
complex decomposition How to decompose a complex number into its real and imaginary parts; how to get the argument and absolute value of a complex number; how to get its complex conjugate. random number How to generate a random integer from a uniform ......
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日期:2025-04-28
The Objective-C 2.0 Essentials online book contains 34 chapters of detailed information intended to provide everything necessary to gain proficiency as an Objective-C programmer for both Mac OS X and iPhone development. Objective-C 2.0 Essentials - Second...
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日期:2025-04-30
iOS 7 brought some interesting new features to Objective-C and Foundation. New compiler features and improved Foundation classes - read all about them! ... Notice the return type is id. The id type is an umbrella type meaning any Objective-C class; it doe...
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日期:2025-04-23
S.N. Method & Purpose 1 - (NSString *)capitalizedString; Returns a capitalized representation of the receiver. 2 - (unichar)characterAtIndex:(NSUInteger)index; Returns the character at a given array position. 3 - (double)doubleValue; Returns the floating-...
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日期:2025-04-23
‹Back to Objective-C Data Types NSArray NSArray is Objective-C’s general-purpose array type. It represents an ordered collection of objects, and it provides a high-level interface for sorting and otherwise manipulating lists of data. Arrays aren’t as effi...
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日期:2025-04-28
Arrays can't be passed as function parameters by value in C. You can put the array in a struct: typedef struct type24 { char byte[3]; } type24; and then pass that by value, but of course then it's less convenient to use: x.byte[0] instead of x[0]. Your fu...
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日期:2025-04-26
[edit] Strings without NSString As we've already discussed, Objective-C is built upon the C programming language. C also has a mechanism for dealing with strings, but because C is not an object oriented programming language it does not have any of the ......