Cocoa & Objective-c学习笔记1 (方法调用)

 方法调用(Calling Methods)

1. 调用

    [object method];

    [object methodWithInput:input];

2.返回值：

output = [object methodWithOutput]; output = [object methodWithInputAndOutput:input];

3.创建对象调用

id myObject = [ Nsstring string];

Nsstring* myString = [ Nsstring string];

4.嵌套调用

c语言：function1 ( function2() );

Objiective-c：[Nsstring stringWithFormat:[prefs format]];

5.多个参数调用

-(BOOL) writetoFile:(Nsstring *)path atomically:(BOOL)useAuxiliaryFile;

BOOL result = [myData writetoFile:@"/tmp/log.txt" atomically:NO];