IOS Study Notes-Implementation of variable attributes

 

IOS Study Notes-Implementation of variable attributes

 

1,CodeNote:

Person. h

Person. h

 # Import <Foundation/Foundation. h> @ Interface  Person: nsobject {  Int Age, Sex; //  Variable definition      Int  Height, width;} @ Property  Int Age, Sex; // Attribute Definition @ Property Char  Height;  //  -(Void) setage; -( Int ) Setage1 :( Int  ); -( Int ) Setwh :( Int ) W :( Int  ) H;  /*  Method Definition Format-(returned data type) method name: (Data Type of parameter 1) parameter 1 Name: (Data Type of parameter 2) parameter 2 Name */  @ End 

Person. m

Person. m

 # Import   "  Person. h  "  @ Implementation  Person  @ Synthesize Age, Sex; //  Accessors  //  @ Synthesize height;  /* [My annotation] @ synthesize reference @ Property Association @ interface cannot be referenced, or cannot be associated, an error is thrown.  */  # Pragma Mark ------ setage ---- //  -(Void) setage;  //  {  //  Age = 20;  //  }  # Pragma Mark ------ setage1 -------( Int ) Setage1 :( Int ) A {age = A;  Return  Age ;}  # Pragma Mark ------ setwh -------( Int ) Setwh :( Int ) W :( Int ) H //  Method implementation  {Width = 100  ; Height = 175 ;  Return Age * Height ;}  @ End 

 

Main. m

Main. m

 # Import <Foundation/Foundation. h> # Import   "  Person. h  "  Int Main ( Int Argc, Const   Char *Argv []) {@ autoreleasepool {person * Person = [Person alloc]; [person init]; person. Age = 1 ; //  Attribute  Nslog (  @"  Person. Ag = % I  " , Person. Age ); //  Output attribute. Pay attention to type matching; otherwise, an error is thrown. Nslog ( @"  Person = % @ " , Person ); //  Output object  [Person setwh:  6 : 10 ]; //  Method  [Person release];  //  If the arc mechanism is used, release cannot be used.  }  Return   0  ;} 

 

 

2. My annotations (For details, see the following three figures.):

@ Synthesize reference @ Property Association @ Interface

If no reference or association is found, an error is thrown.