Question

my.h file

@interface myObject : NSObject {
    NSMutableDictionary *myDictn ;
}

i have a property

@property (nonatomic,retain) NSMutableDictionary *myDictn ;

then in .m File

i have a allocated it from id

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

my Question is i have mentioned Retain in Property and i have allocated memory also (is Retain Count goes to 2 in (id)init )
so how to manage memory in this case ?
i am new to this so dnt have much idea regarding memory management .

one more thing if i have a method x in my code and i also allocated memory to myDictn then in that case also how can i use release .??
Thanks in Advance .

Answer 1

The proper way to initialize a retained property is:

NSMutableDictionary *newDict = [[NSMutableDictionary alloc] init];
self.myDictn = newDict;
[newDict release];

or alternatively:

self.myDict = [NSMutableDictionary dictionary];

The first method makes sure not to increase the already retained property’s retain count by performing alloc,init (an action that increments retain count) on a temporary object.

The second method uses a convenience method for obtaining an autoreleased instance of the dictionary.