提要：單例設計模式需要重寫父類的方法。因為全局實例不允許釋放，所以和內存管理相關的retain，release，autorelease方法均需要重寫，重寫的目的就是避免對這個實例的內存方面進行操作，防止引用計數發生變化。

單例模式具體實例代碼如下：

SingletonTeather.h文件

#import

 

@interface SingletonTeather : NSObject

@property (nonatomic,strong) NSString *name;

//@property (nonatomic,assign) NSInteger age;

@property (nonatomic,strong) NSMutableDictionary *info;

+(SingletonTeather *)getSingletonTeather;

@end

 

SingletonTeather.c文件

#import SingletonTeather.h

 

staticSingletonTeather *shareSingletonTeather = nil;

 

@implementation SingletonTeather

 

@synthesize name,info;

 

+(SingletonTeather *)getSingletonTeather

{

if (shareSingletonTeather == nil) {

shareSingletonTeather = [[SingletonTeatheralloc]init];

}

 

return shareSingletonTeather;

}

 

+(id)allocWithZone:(struct_NSZone *)zone

{

if (shareSingletonTeather == nil) {

shareSingletonTeather = [[superallocWithZone:zone]init];

}

return shareSingletonTeather;

}

 

-(id)copyWithZone:(struct_NSZone *)zone

{

return self;

}

 

-(NSUInteger)retainCount

{

return NSIntegerMax;

}

 

-(id)retain

{

return self;

}

 

-(onewayvoid)release

{

 

}

 

-(id)autorelease

{

return self;

}

@end