object sharing among view controllers

I was wondering how can I share a NSDictionary objects among several view controllers which basically are tabs in my application.

I tried using a protocol, like in Java, so that I can cast to the protocol and access the property. That doesn't seem to work.

Also I had a look at similar question at How to share data globally among multiple view controllers

But I observed that the appDelegate method is not safe and may lead to memory leak.

Similarly injection on class A into class B will create the same problem.

So can anyone suggest me any method which i should study or implement in my code?

---

如果你只想分享Dictionary，为什么不从辅助类中去使用类方法。

+(NSDictionary *)shareMethod
{
return dict;
} 

---

You can use singleton class for sharing the data
Check this Singleton class

MyManger.h

#import <foundation/Foundation.h>

@interface MyManager : NSObject {
NSMutableDictionary *_dict
}

@property (nonatomic, retain) NSMutableDictionary *dict;

 + (id)sharedManager;  
@end 

MyManger.m

#import "MyManager.h"

static MyManager *sharedMyManager = nil;

 @implementation MyManager

 @synthesize dict = _dict;

#pragma mark Singleton Methods  

+ (id)sharedManager {
 @synchronized(self) {
    if(sharedMyManager == nil)
      sharedMyManager = [[super allocWithZone:NULL] init];
 }
return sharedMyManager;
} 

- (id)init {
   if (self = [super init]) {
  dict = [[NSMutableDictionary alloc] init];
   }
 return self;
}   

You can access your dictionary from everywhere like this

   [MyManager sharedManager].dict

---

I found a way out. Since I want a dictionary to be shared across, I declared a method in my protocol

- (void) setSingleHouse:(NSDictionary*) singleHouse;

In each of my controller I implemented the method in a appropriate manner. Hence I was able to share across them for now.

Also I figured out that I was casting in a wrong way earlier ie (@protocol(protocol name)). Now changed it into NSObject .

Sorry for the fuss.

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