objectivec function

- (return_type)instanceMethod1:(param1_type)param1_varName :(param2_type)param2_varName;

- (return_type)instanceMethod2WithParameter :(param1_type)param1_varName andOtherParameter:(param2_type)param2_varName;

The code above is roughly equivalent to the following C++

return_type instanceMethod1(param1_type param1_varName, param2_type param2_varName);

 return_type instanceMethod2WithParameter(param1_type param1_varName, param2_type param2_varName=default);

Note that instanceMethod2WithParameter:andOtherParameter: demonstrates the interleaving of selector segments with argument expressions, for which there is no direct equivalent in C/C++.   ----?

 

函数参数语法

：(参数类型) 参数名称

In some cases (e.g. when writing system APIs) it is useful to add descriptive text before each parameter.

描述文字：(参数类型) 参数名称

函数调用：

- (int)changeColorToRed:(float)red green:(float)green blue:(float)blue;
 
[myColor changeColorToRed:5.0 green:2.0 blue:6.0];

The syntax allows pseudo-naming of arguments.

 

http://en.wikipedia.org/wiki/Objective-C