Memory Management under arc (2) Reference relationship between objects and members

Memory Management under arc (2) Reference relationship between objects and members

Procedure List 2-1

myObjStrong = [[MyObject alloc] init];myObjStrong.strStrong = [array objectAtIndex:5];myObjStrong.strWeak = [array objectAtIndex:6];__weak MyObject *myObjWeak;    myObjWeak = myObjStrong; 

The following "releases" the strong Member of the weak object:

myObjWeak.strStrong = nil;

Consider the following output:

NSLog(@"weak object's stong member:%@", myObjWeak.strStrong);NSLog(@"strong object's strong member:%@", myObjStrong.strStrong);

Observed results

 

 

Visible:A weak object member is a strong object member.

 

Comparison execution:

Procedure List 2-2

myObjWeak.strWeak = nil;NSLog(@"weak object's weak member:%@", myObjWeak.strWeak);NSLog(@"strong object's strong member:%@", myObjStrong.strStrong);NSLog(@"strong object's weak member:%@", myObjStrong.strWeak);

The above output is:

 

Further observe the value in array

Procedure List 2-3

NSLog(@"string 5:%@",  [array objectAtIndex:5]);NSLog(@"string 6:%@", [array objectAtIndex:6]);

 

The original string object is not released.

In fact, because of the existence of the strong attribute array, no matter whether myobjweak or myobjstrong is left empty (= nil), the string in it cannot be released;

Questions:

Put myobject into array and reference weak and strong respectively. Can I release myobject members in array by referencing them?