GCDispatch

Inherits From: NSObject

Declared In: GCDispatch.h

Overview

The GCDispatch class provides a simple interface for performing blocks using Grand Central Dispatch queues.

To use this class, simply run the method most applicable to your concurrency needs.

Tasks

Performing Tasks on the Main Queue

+ performBlockInMainQueue:
+ performBlockInMainQueue:completion:
+ performBlocksInMainQueue:
+ performBlocksInMainQueue:completion:

Performing Tasks on the Background Queue

+ performBlockInBackgroundQueue:
+ performBlockInBackgroundQueue:completion:
+ performBlocksInBackgroundQueue:
+ performBlocksInBackgroundQueue:completion:

Running Tasks after Delay

+ performBlock:inMainQueueAfterDelay:
+ performBlock:inQueue:afterDelay:

Running Tasks Repeatedly

+ performBlock:inMainQueueNumberOfTimes:
+ performBlock:inQueue:numberOfTimes:

Running Tasks Once

+ performBlockOnce:inMainQueueWithToken:

Running Tasks by Condition

+ performBlock:inMainQueueWhen:
+ performBlock:inQueue:when:

`typedefs`

typedef size_t GCDispatchIteration;

Used to indicate the current iteration in GCDispatchIterativeBlocks.

typedef dispatch_once_t GCDispatchOnceToken;

Used to determine if work has been performed before.

typedef void(^GCDispatchBlock)();

A void-returning block that takes no parameters.

typedef void(^GCDispatchIterativeBlock)(GCDispatchIteration currentIteration);

A void-returning block that takes a GCDispatchIteration representing the current iteration.

typedef _Bool(^GCDispatchConditionalBlock)();

A block that takes no parameters are returns either a truthy or falsey value.

Class Methods

performBlockInMainQueue:

Submits the given block for executing on the main queue and returns immediately.

+ (void)performBlockInMainQueue:(GCDispatchBlock)block;

Parameters:

block

The block to execute on the main queue.

performBlockInMainQueue:completion:

Submits the given block for executing on the main queue and returns immediately.

+ (void)performBlockInMainQueue:(GCDispatchBlock)block completion:(GCDispatchBlock)completion;

Parameters:

block

The block to execute on the main queue.

completion

The block to execute on the main queue when block has completed.

performBlocksInMainQueue:

Submits the given blocks for executing, in sequence, on the main queue and returns immediately.

+ (void)performBlocksInMainQueue:(NSArray *)blocks;

Parameters:

blocks

The blocks to execute on the main queue.

performBlocksInMainQueue:completion:

Submits the given blocks for executing, in sequence, on the main queue and returns immediately.

+ (void)performBlocksInMainQueue:(NSArray *)blocks completion:(GCDispatchBlock)completion;

Parameters:

blocks

The blocks to execute on the main queue.

completion

The block to execute on the main queue when block has completed.

performBlockInBackgroundQueue:

Submits the given block for executing on a background queue and returns immediately.

+ (void)performBlockInBackgroundQueue:(GCDispatchBlock)block;

Parameters:

block

The block to execute on a background queue.

performBlockInBackgroundQueue:completion:

Submits the given block for executing on the background queue and returns immediately.

+ (void)performBlockInBackgroundQueue:(GCDispatchBlock)block completion:(GCDispatchBlock)completion;

Parameters:

block

The block to execute on the background queue.

completion

The block to execute on the main queue when block has completed.

performBlocksInBackgroundQueue:

Submits the given blocks for executing, in sequence, on the background queue and returns immediately.

+ (void)performBlocksInBackgroundQueue:(NSArray *)blocks;

Parameters:

blocks

The blocks to execute on the main queue.

performBlocksInBackgroundQueue:completion:

Submits the given blocks for executing, in sequence, on the background queue and returns immediately.

+ (void)performBlocksInBackgroundQueue:(NSArray *)blocks completion:(GCDispatchBlock)completion;

Parameters:

blocks

The blocks to execute on the background queue.

completion

The block to execute on the main queue when block has completed.

performBlock:inMainQueueAfterDelay:

+ (void)performBlock:(GCDispatchBlock)block inMainQueueAfterDelay:(NSTimeInterval)delay;

Executes a block on the main queue after the specified time.

Parameters:

block

The block to execute on the main queue.

delay

The amount of time in seconds to wait before executing the given block.

performBlock:inQueue:afterDelay:

+ (void)performBlock:(GCDispatchBlock)block inQueue:(GCDispatchQueue *)queue afterDelay:(NSTimeInterval)delay;

Executes a block on the given queue after the specified time.

Parameters:

block

The block to execute on the given queue.

delay

The amount of time in seconds to wait before executing the given block.

queue

A GCDispatchQueue object representing the desired dispatch_queue on which to run the given block.

performBlock:inMainQueueNumberOfTimes:

+ (void)performBlock:(GCDispatchIterativeBlock)block inMainQueueNumberOfTimes:(NSInteger)times;

Executes a block on the main queue the specified number of times.

Parameters:

block

The block to execute on the main queue.

times

The number of times to execute the block.

Discussion:

The GCDispatchIteration block parameter, currentIteration, represents the number of times this block has been run so far.

performBlock:inQueue:numberOfTimes:

+ (void)performBlock:(GCDispatchIterativeBlock)block inQueue:(GCDispatchQueue *)queue numberOfTimes:(NSInteger)times;

Executes a block on the main queue the specified number of times.

Parameters:

block

The block to execute on the main queue.

times

The number of times to execute the block.

queue

A GCDispatchQueue object representing the desired dispatch_queue on which to run the given block.

Discussion:

The GCDispatchIteration block parameter, currentIteration, represents the number of times this block has been run so far.

performBlockOnce:inMainQueueWithToken:

+ (void)performBlockOnce:(GCDispatchBlock)block inMainQueueWithToken:(GCDispatchOnceToken)token;

Executes a block on the main queue exactly once.

Parameters:

block

The block to execute on the main queue.

token

The static GCDispatchOnceToken token used to determine whether or not this block has run before.

performBlock:inMainQueueWhen:

+ (void)performBlock:(GCDispatchBlock)block inMainQueueWhen:(GCDispatchConditionalBlock)conditionalBlock;

Executes a block when the given conditional block returns truthfully.

Parameters:

block

The block to execute on the main queue.

conditionalBlock

The block that, when it returns a truthy value, causes the execution of the given block.

performBlock:inQueue:when:

+ (void)performBlock:(GCDispatchBlock)block when:(GCDispatchConditionalBlcok)conditionalBlock inQueue:(GCDispatchQueue *)queue;

Executes a block when the given conditional block returns truthfully.

Parameters:

block

The block to execute on the main queue.

conditionalBlock

The block that, when it returns a truthy value, causes the execution of the given block.

queue

A GCDispatchQueue object representing the desired dispatch_queue on which to run the given block.

GCDispatchQueue

Inherits From: NSObject

Declared In: GCDispatchQueue.h

Overview

The GCDispatchQueue class provides a wrapper around Grand Central Dispatch queues, as well as a means of performing blocks on said queues.

Tasks

Creating Queues

- initWithLabel:
- initWithLabel:andConcurrency:

Accessing Singletons

+ mainQueue
+ backgroundQueue

Managing Properties

label (property)

Determining the Current State

+ currentQueueIsMainQueue

Performing Actions

- performBlock:
- performBlock:completion:
- performBlocks:
- performBlocks:completion:

Class Methods

mainQueue

A GCDispatchQueue object representing the global main_queue.

+ (GCDispatchQueue *)mainQueue;

Returns:

A GCDispatchQueue object representing the global main_queue.

backgroundQueue

A GCDispatchQueue object representing a dispatch_queue with DISPATCH_QUEUE_PRIORITY_BACKGROUND.

+ (GCDispatchQueue *)backgroundQueue;

Returns:

A GCDispatchQueue object representing a dispatch_queue with DISPATCH_QUEUE_PRIORITY_BACKGROUND.

currentQueueIsMainQueue

Returns YES if the current queue is the main queue.

+ (BOOL)currentQueueIsMainQueue;

Returns:

YES if the current queue is the main queue.

Properties

label

@property NSString *label;

An NSString label used in identifying the GCDispatchQueue.

Instance Methods

initWithLabel:

- (id)initWithLabel:(NSString *)label;

Initializes and returns a GCDispatchQueue object with the given label and GCDispatchSerialQueue concurrency.

Parameters:

label

The NSString label used to identify this GCDispatchQueue.

Returns:

A GCDispatchQueue object with the given label and GCDispatchSerialQueue concurrency.

initWithLabel:andConcurrency:

- (id)initWithLabel(NSString *)label andConcurrency:(GCDispatchQueueConcurrency)concurrency;

Initializes and returns a GCDispatchQueue object with the given label and concurrency.

Parameters:

label

The NSString label used to indentify this GCDispatchQueue.

concurrency

A GCDispatchQueueConcurrency.

Returns:

a GCDispatchQueue object with the given label and concurrency.

performBlock:

- (void)performBlock:(GCDispatchBlock)block;

Performs the given block on this queue.

Parameters:

block

The block to perform on this queue.

performBlock:completion:

- (void)performBlock:(GCDispatchBlock)block completion:(GCDispatchBlock)completion;

Performs the given block on this queue.

Parameters:

block

The block to perform on this queue.

completion

The block to execute on the main queue when block has completed.

performBlocks:

- (void)performBlock:(NSArray *)blocks;

Performs the given blocks, in sequence, on this queue.

Parameters:

blocks

The blocks to perform on this queue.

performBlocks:completion:

- (void)performBlock:(NSArray *)blocks completion:(GCDispatchBlock)completion;

Performs the given blocks, in sequence, on this queue.

Parameters:

blocks

The blocks to perform on this queue.

completion

The block to execute on the main queue when blocks have completed.

Constants

GCDispatchQueueConcurrency

The battery power state of the device

typedef enum
{
    GCDispatchSerialQueue,
    GCDispatchConcurrentQueue
} GCDispatchQueueConcurrency;

Discussion:

Queues with concurrency GCDispatchSerialQueue execute a single task at a time, whereas queues with GCDispatchConcurrentQueue concurrency execute multiple tasks at a time.

License

License Agreement for Source Code provided by Patrick Perini

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GCDispatch

GCDispatch

Overview

Tasks

Performing Tasks on the Main Queue

Performing Tasks on the Background Queue

Running Tasks after Delay

Running Tasks Repeatedly

Running Tasks Once

Running Tasks by Condition

`typedefs`

Class Methods

GCDispatchQueue

Overview

Tasks

Creating Queues

Accessing Singletons

Managing Properties

Determining the Current State

Performing Actions

Class Methods

Properties

Instance Methods

Constants

License

Built With

Updates