写一个Person类，要保证无论什么情况下创建Person对象返回的都是同一个对象（单例设计模式）
@interface Person : NSObject

+ (Person *)sharedManager;

@property (nonatomic,retain) NSString *name;

@end


//Person类的实现
@implementation Person
//定义一个全局变量，这句不能掉。

static Person *per =nil;

+ (Person *)sharedManager

{
    if(per == nil){
     per = [Person new];
}
   return per;
}
@end


#import <Foundation/Foundation.h>

#import "Person.h"

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

    Person *person1 = [Person sharedManager];
    Person1.name = @"lixue";
    Person *person2 = [Person sharedManager];
     
    NSLog(@"%p", person1);

    NSLog(@"%p", person2);

    return 0;

}

写一个Person类，要保证无论什么情况下创建Person对象返回的都是同一个对象（单例设计模式）
@interface Person : NSObject

+ (Person *)sharedManager;

@property (nonatomic,retain) NSString *name;

@end


//Person类的实现
@implementation Person
//定义一个全局变量，这句不能掉。

static Person *per =nil;

+ (Person *)sharedManager

{
    if(per == nil){
     per = [Person new];
}
   return per;
}
@end


#import <Foundation/Foundation.h>

#import "Person.h"

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

    Person *person1 = [Person sharedManager];
    Person1.name = @"lixue";
    Person *person2 = [Person sharedManager];
     
    NSLog(@"%p", person1);

    NSLog(@"%p", person2);

    return 0;

}