Avoid Excessive Retaining Mistake

When I ran "Analyze" on my project, I got a lot of "potential leak" warnings. I thought I was carefully managing object retaining but I did stupid mistakes everywhere.

part of the sample header file

@property (nonatomic, retain) ClassA objA;

part of the sample source file

@synthesize objA;
...
self.objA = [[ClassA alloc] init];
...
// done using objA instance
[self.objA release];

Above example seems good and there is no places for mistake. But actually retaining is happened twice.

• objA has "retain" attribute
• it will retain anything with assigning operator ("=")
• "alloc" method will increase retain count too

Corrected code

Class *tmpA = [[ClassA alloc] init];
self.objA = tmpA;
[tmpA release];
...
// done using objA instance
[self.objA release];