iOS登录单例

#import <Foundation/Foundation.h>

@interface UserInfo : NSObject

+ (id)sharedManager;

@property (nonatomic , retain) NSString* username;
@property (nonatomic , retain) NSString* password;

@end

#import "UserInfo.h"

static UserInfo * userInfo;

@implementation UserInfo


#pragma mark - 获取单例
+ (id)sharedManager{
    if (!userInfo) {
        userInfo = [[UserInfo alloc]init];
    }
    return userInfo;
}


@end

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

#import "RootViewController.h"
//加入头文件
#import "UserInfo.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    
    //给单例的变量赋值
    [[UserInfo sharedManager] setUsername:@"李华"];
    [[UserInfo sharedManager] setPassword:@"123456"];
    
    
    //打印单例的值
    NSLog(@"---userName----%@",[[UserInfo sharedManager] username]);
    NSLog(@"------password---%@",[[UserInfo sharedManager] password]);
    
    
}

2015-10-14 15:09:55.922 登陆单例[3940:183668] ---userName----李华
2015-10-14 15:09:55.923 登陆单例[3940:183668] ------password---123456