Objective-C Basic

最新推荐文章于 2025-08-12 18:58:05 发布

转载最新推荐文章于 2025-08-12 18:58:05 发布 · 145 阅读

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原文链接：http://www.cnblogs.com/davidgu/p/3453939.html

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#移动开发

本文深入探讨了Objective-C中的方法调用机制，包括类方法、实例方法的调用方式，以及方法命名规则与其参数数量之间的关系。通过具体示例说明了如何正确调用不带参数、单参数及多参数的方法。

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1. Methods and Messages

a) class method - call it by sending a message to the class itself
b) instance method - call it by sending a message to an instance of the class

An Objective-C method’s name must contain exactly as many colons as the method
takes parameters, and, the parameter name must end with a colon

c) Calling a Method
eg:
NSString* s = @"Hello, world!";
NSString* s2 = [s uppercaseString];
<=>
NSString* s2 = [@"Hello, world!" uppercaseString];

//If a method takes no parameters, then its name contains no colons
//If a method takes two or more parameters, its name contains that number of colons
eg:
[someObject hereAreThreeStrings: @"string1" : @"string2" : @"string3"];

转载于:https://www.cnblogs.com/davidgu/p/3453939.html