IOS learning notes-Implementation of variable attributes

1. Code Description:

Person. h

Person. h

# Import

@ 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 annotations]

@ Synthesize reference @ property Association @ interface

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

*/

# Pragma mark ------ setAge ----

//-(Void) setAge;

//{

// Age = 20;

//}

# Pragma mark ------ setAge1 ------

-(Int) setAge1 :( int)

{

Age =;

Return age;

}

# Pragma mark ------ setWH ------

-(Int) setWH :( int) w :( int) h // method implementation

{

Length = 100;

Height = 175;

Return age * height;

}

@ End

Main. m

Main. m

# Import

# 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 attributes. 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 (see the following three figures ):

@ Synthesize reference @ property Association @ interface

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