便利构造器

遍历构造器封装了对象创建的过程:

内部实现:封装了alloc和初始化操作,创建对象更加方便快捷.

.h文件中:

.m文件中:

-(id)initWithName:(NSString*)name sex:(NSString*)sex age:(NSInteger)age school:(NSString*)school number:(NSInteger)number major:(NSString*)major academy:(NSString*)academy

{

self= [super initWithName:name sex:sex age:age school:school number:number];

if(self) {

_major= major;

_academy= academy;

}

returnself;

}

//实现便利构造器

+(id)collegeStudentWithName:(NSString*)name sex:(NSString*)sex age:(NSInteger)age school:(NSString*)school number:(NSInteger)number major:(NSString*)major academy:(NSString*)academy

{

CollegeStudent*student = [[CollegeStudent alloc]initWithName:name sex:sexage:ageschool:school number:number major:major academy:academy];

return student;

}

方法实现:

//创建一个大学生

CollegeStudent *student1=[CollegeStudent collegeStudentWithName:@"张三" sex:@"男" age:18 school:@"�清华大学" number:123123123 major:@"�信息学院" academy:@"�电子信息工程技术"];