By Kazuki Sakamoto

If you need to advance effective, smooth-running purposes, controlling concurrency and reminiscence are very important. automated Reference Counting is Apple's game-changing reminiscence administration process, new to Xcode 4.2. Pro Multithreading and reminiscence administration for iOS and OS X indicates you the way ARC works and the way top to include it into your purposes. Grand relevant Dispatch (GCD) and blocks are key to constructing nice apps, permitting you to regulate threads for max performance.

If for you, multithreading is an unsolved secret and ARC is unexplored territory, then this is often the e-book you will need to make those thoughts transparent and ship you in your strategy to changing into a grasp iOS and OS X developer.

  • What are blocks? How are they used with GCD?
  • Multithreading with GCD
  • Managing items with ARC

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Additional info for Pro Multithreading and Memory Management for iOS and OS X: with ARC, Grand Central Dispatch, and Blocks (Professional Apress)

Example text

Id __weak obj1 = obj0; /* * variable obj1 has a weak reference of the created object */ } /* * Leaving the scope of variable obj0, its strong reference disappears. * The object is released automatically. * Because no one has ownership, the object is discarded. */ 41 42 CHAPTER 2: ARC Rules Because a __weak reference does not have ownership, the object is disposed of when the control flow leaves the variable scope. Now we’ve learned that we should use the __weak ownership qualifier to avoid cyclic reference.

But it is not recommended. Please be careful when you use them. Let’s see one more example. void *p = (__bridge_retained void *)[[NSObject alloc] init]; NSLog(@"class=%@", [(__bridge id)p class]); (void)(__bridge_transfer id)p; This source code can be rewritten for a non-ARC environment as follows. /* non-ARC */ id p = [[NSObject alloc] init]; NSLog(@"class=%@", [p class]); [p release]; These casts are used frequently to convert Objective-C objects and Core Foundation objects. OBJECTIVE-C OBJECT AND CORE FOUNDATION OBJECT A Core Foundation object is an object used with the Core Foundation Framework.

You can take ownership of an object using retain.  When you no longer need it, you must relinquish ownership of an object of which you have ownership.  You must not relinquish ownership of an object of which you don’t have ownership. The first two rules are achieved by assigning to a __strong variable. The third rule is achieved automatically by leaving variable scope, by assigning to variables, or when objects having a member variable are discarded. The last rule is very clear because releases are never typed.

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