By Kazuki Sakamoto
ISBN-10: 1430241160
ISBN-13: 9781430241164
If you must strengthen effective, smooth-running purposes, controlling concurrency and reminiscence are important. computerized Reference Counting is Apple's game-changing reminiscence administration method, new to Xcode 4.2. Pro Multithreading and reminiscence administration for iOS and OS X exhibits you the way ARC works and the way most sensible to include it into your purposes. Grand relevant Dispatch (GCD) and blocks are key to constructing nice apps, permitting you to manage threads for max performance.
If for you, multithreading is an unsolved secret and ARC is unexplored territory, then this is often the ebook you will have to make those strategies transparent and ship you in your method to changing into a grasp iOS and OS X developer.
- What are blocks? How are they used with GCD?
- Multithreading with GCD
- Managing gadgets with ARC
Read Online or Download Pro Multithreading and Memory Management for iOS and OS X: with ARC, Grand Central Dispatch, and Blocks (Professional Apress) PDF
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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
For instance, it occurs when a member variable of a class has a reference to an object. Assume that we have a class as in Listing 2–4. Listing 2–4. _A class that may cause circular reference @interface Test : NSObject { id __strong obj_; } - (void)setObject:(id __strong)obj; CHAPTER 2: ARC Rules @end @implementation Test - (id)init { self = [super init]; return self; } - (void)setObject:(id __strong)obj { obj_ = obj; } @end We can easily produce a circular reference problem with the class as in Listing 2–5.
_Strong qualifiers for member variable and method’s argument @interface Test : NSObject { id __strong obj_; } - (void)setObject:(id __strong)obj; @end @implementation Test - (id)init { self = [super init]; return self; } - (void)setObject:(id __strong)obj CHAPTER 2: ARC Rules { obj_ = obj; } @end Let’s see how we can use the class. { id __strong test = [[Test alloc] init]; [test setObject:[[NSObject alloc] init]]; } As usual, let’s investigate line by line with some comments (Listing 2–3). Listing 2–3.
At this moment, both obj0 and obj1 have strong references to object B. */ obj2 = obj0; /* * Through obj0, obj2 has a strong reference to object B. * * At this moment, obj0, obj1 and obj2 have strong references to object B. */ obj1 = nil; /* * Because nil is assigned to obj1, strong references to object B disappear. * * At this moment, obj0 and obj2 have strong references to object B. */ obj0 = nil; /* * Because nil is assigned to obj0, a strong reference to object B disappears. * * At this moment, obj2 has a strong reference to object B.
Pro Multithreading and Memory Management for iOS and OS X: with ARC, Grand Central Dispatch, and Blocks (Professional Apress) by Kazuki Sakamoto
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