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#import 
   
    @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);

2014-03-26 14:45:34.181 zhou1[4255:60b] 
   
    2014-03-26 14:45:34.181 zhou1[4255:60b] 
    
     ------heelloo
    
   

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