IOS---单例模式

#import <Foundation/Foundation.h>@interface Singleton : NSObject+(Singleton*)sharedSingleTon;@property(nonatomic,strong)NSString *singtonData;@end

#import "Singleton.h"@implementation Singleton//@synthesize singtonData = _singtonData;static Singleton *sharedManager = nil;+(Singleton*)sharedSingleTon{    static dispatch_once_t once;        dispatch_once(&once, ^{        sharedManager = [[self alloc]init];    });    return sharedManager;}@end

测试：

 Singleton *s1=   [Singleton sharedSingleTon];        s1.singtonData = @"heelloo";        NSLog(@"%@",s1);        Singleton *s2=   [Singleton sharedSingleTon];    NSLog(@"%@------%@",s2,s2.singtonData);    

结果：

2014-03-26 14:45:34.181 zhou1[4255:60b] <Singleton: 0xab2ac80>2014-03-26 14:45:34.181 zhou1[4255:60b] <Singleton: 0xab2ac80>------heelloo