oc 工厂方法

@interface People : NSObject{
    int _age;
    NSString* _name;
}
-(int)getAge;
-(NSString*)getName;
+(People*)peopleWithAge:(int)age andName:(NSString*)name;//+就是工厂方法，即表示静态方法

-(id)initWidthAge:(int)age andName:(NSString*)name;//id指的是任意类型 @end

@implementation People
-(int)getAge{
    return _age;
}
-(NSString*)getName{
    return _name;
}
+(People*)peopleWithAge:(int)age andName:(NSString*)name{
    return [[People alloc] initWidthAge:age andName:name];
}

- (instancetype)initWidthAge:(int)age andName:(NSString *)name
{
    self = [super init];
    if (self) {
        _age=age;
        _name=name;
    }
    return self;
}

@end

#import <UIKit/UIKit.h>
#import "AppDelegate.h"
#import "People.h"

int main(int argc, char * argv[]) {
    People *p=[People peopleWithAge:30 andName:@"netcorner"];
    NSLog(@"p.age %d,p.name %@",[p getAge], [p getName]);
}