多线程练习 -- 单例设计模式

Singleton.h

#define singleton_h(name) + (instancetype)shared##name;

#if __has_feature (objc_arc)

#define singleton_m(name) 
static id _instance; 

+ (id)allocWithZone:(struct _NSZone *)zone 
{ 
    static dispatch_once_t onceToken; 
    dispatch_once(&onceToken, ^{ 
        _instance = [super allocWithZone:zone]; 
    }); 
    return _instance; 
} 

+ (instancetype)sharedOnlyoneClass 
{ 
    static dispatch_once_t onceToken; 
    dispatch_once(&onceToken, ^{ 
        _instance = [[self alloc] init]; 
    }); 
    return _instance; 
}


#else

#define singleton_m(name) 
static id _instance; 

+ (id)allocWithZone:(struct _NSZone *)zone 
{ 
static dispatch_once_t onceToken; 
dispatch_once(&onceToken, ^{ 
_instance = [super allocWithZone:zone]; 
}); 
return _instance; 
} 

+ (instancetype)shared##name 
{ 
static dispatch_once_t onceToken; 
dispatch_once(&onceToken, ^{ 
_instance = [[self alloc] init]; 
}); 
return _instance; 
} 
- (oneway void)release 
{ 
   
} 
- (id)retain 
{
    return _instance; 
} 

- (NSUInteger)retainCount 
{ 
    return 1; 
} 

- (id)autorelease 
{ 
    return _instance; 
} 

+ (id)copyWithZone:(struct _NSZone *)zone 
{ 
    return _instance; 
} 

+ (id)mutableCopyWithZone:(struct _NSZone *)zone 
{ 
    return _instance; 
}

#endif

LWTOnlyoneClass.h

#import <Foundation/Foundation.h>
#import "Singleton.h"

@interface LWTOnlyoneClass : NSObject

@property (nonatomic, copy) NSString *name;

singleton_h(OnlyoneClass)

@end

LWTOnlyoneClass.m

//
//  LWTOnlyoneClass.m
//  多线程练习 -- 单例设计模式
//
//  Created by apple on 14-6-24.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTOnlyoneClass.h"

@implementation LWTOnlyoneClass

- (instancetype)init
{
    self = [super init];
    if (self) {
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            self.name = @"jack";
        });
    }
    return self;
}

singleton_m(OnlyoneClass)

@end

LWTViewController.h

#import <UIKit/UIKit.h>

@interface LWTViewController : UIViewController

@end

LWTViewController.m

//
//  LWTViewController.m
//  多线程练习 -- 单例设计模式
//
//  Created by apple on 14-6-24.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTViewController.h"
#import "LWTOnlyoneClass.h"

@interface LWTViewController ()

@end

@implementation LWTViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    LWTOnlyoneClass *onlyone1 = [[LWTOnlyoneClass alloc] init];
    LWTOnlyoneClass *onlyone2 = [LWTOnlyoneClass sharedOnlyoneClass];
    onlyone2.name = @"Tom";
    LWTOnlyoneClass *onlyone3 = [[LWTOnlyoneClass alloc] init];
    onlyone3.name = @"rose";
    LWTOnlyoneClass *onlyone4 = [LWTOnlyoneClass sharedOnlyoneClass];
    onlyone4.name = @"jim";
    
//#if __has_feature (objc_arc)
//    LWTOnlyoneClass *onlyone5 = [LWTOnlyoneClass sharedOnlyoneClass];
//    LWTOnlyoneClass *onlyone6 = [LWTOnlyoneClass sharedOnlyoneClass];
////#else
//    LWTOnlyoneClass *onlyone5 = [onlyone2 copy];
//    LWTOnlyoneClass *onlyone6 = [onlyone3 mutableCopy];
//#endif
    
    
    
    NSLog(@"%p -- %p -- %p -- %p", onlyone1, onlyone2, onlyone3, onlyone4);
    NSLog(@"%@ -- %@ -- %@ -- %@", onlyone1.name, onlyone2.name, onlyone3.name, onlyone4.name);
}


@end