OC的单例模式的实现

以下是在ARC,GCD下的单例模式实现:

头文件中申明类方法getInstance:

#import <Foundation/Foundation.h>

@interface SingleTon : NSObject
+ (SingleTon*) getInstance;

@property (nonatomic,strong) NSString* SingleData;

@end

@implementation SingleTon
static  SingleTon* instance;

-(instancetype)init{
    static dispatch_once_t once;
    dispatch_once(&once,^{
        instance = [super init];
        if(nil != instance){
            instance.SingleData = @"init";
        }
    });
    return instance;
}

+(SingleTon *) getInstance{
    if(nil == instance){
        instance = [[self alloc]init];
    }
    return instance;
}

@end

OC的单例模式的实现

原文：http://blog.csdn.net/luo_xianming/article/details/46965039