Objective-c Learning-facilitation of initialization functions and convenience constructors

In object-oriented languages, OBJECTIVE-C's handy initialization function can be understood as a constructor with parameters, such as java,c++, but somewhat different ...

For example, use the student class as an example

　　

First is the Student.h file

#import <Foundation/Foundation.h>  

@interface Student: nsobject  

Defining Properties

@property nsstring *studentname; // student name

@property int age ; // student age

　constructors with name parameters and age parameters ( facilitates construction of initialization functions )

-(ID) initwithname: (nsstring *) name andwithage: (int) age;

　Convenience Constructors ( is class method )

+ (ID) initwithname: (nsstring *) name andwithage: (int) age;

@end

Then the STUDENT.M file that manages the implementation

#import "Student.h"

@implementation Student

　Constructors with name parameters and age parameters (facilitates construction of initialization functions)

-(ID) Initwithname: (NSString *) name andwithage: (int) Age

{

if (self = [super init])

{

[Self setstudentname:name];

[Self setage:age];

}

return self;

}

　　Convenience constructors (is class method)

+ (ID) initwithname: (NSString *) name andwithage: (int) Age

{

Student *student = [[Student alloc] Initwithname:name andwithage:age];

return student ;

}

@end

See Usage in MAIN.M

#import <Foundation/Foundation.h>

#import "Student.h"

int main (int argc, const char * argv[]) {

//Pre-defined method

Student *student = [[Student alloc]initwithname:@ "Xiao Ming" andwithage:19];

        

//With convenient constructors, it can be seen from a convenient constructor that the definition is much simpler

Student *student1 = [Student initwithname:@ "Xiao Ming" andwithage:19];

return 0;

}

Objective-c Learning-facilitation of initialization functions and convenience constructors