Class: UIActivityItemProvider

Inherits:
NSOperation show all

Overview

A UIActivityItemProvider object is a proxy for data passed to an activity view controller. You can use a provider object in situations where you want to make data available for use by an activity but you want to delay providing that data until it is actually needed. For example, you might use a provider object to represent a large video file that needs to be processed before it can be shared to a user’s social media account.

Instance Attribute Summary (collapse)

Instance Method Summary (collapse)

Methods inherited from NSOperation

#addDependency:, #cancel, #completionBlock, #dependencies, #init, #isCancelled, #isConcurrent, #isExecuting, #isFinished, #isReady, #main, #queuePriority, #removeDependency:, #setCompletionBlock:, #setQueuePriority:, #setThreadPriority:, #start, #threadPriority, #waitUntilFinished

Methods inherited from NSObject

#!, #!=, #!~, #, #==, #===, #=~, #Rational, #__callee__, #__method__, #__send__, #__type__, `, alloc, allocWithZone:, #autoContentAccessingProxy, autoload, autoload?, autorelease_pool, #awakeAfterUsingCoder:, binding, block_given?, caller, cancelPreviousPerformRequestsWithTarget:, cancelPreviousPerformRequestsWithTarget:selector:object:, catch, class, classFallbacksForKeyedArchiver, #classForCoder, #classForKeyedArchiver, classForKeyedUnarchiver, #clone, conformsToProtocol:, #copy, copyWithZone:, #dealloc, #define_singleton_method, description, display, #doesNotRecognizeSelector:, #dup, #enum_for, #eql?, #equal?, #extend, fail, #finalize, format, #forwardInvocation:, #forwardingTargetForSelector:, framework, #freeze, #frozen?, getpass, gets, global_variables, #init, initialize, #initialize_clone, #initialize_copy, #initialize_dup, #inspect, instanceMethodForSelector:, instanceMethodSignatureForSelector:, #instance_eval, #instance_exec, #instance_of?, #instance_variable_defined?, #instance_variable_get, #instance_variable_set, #instance_variables, instancesRespondToSelector:, isSubclassOfClass:, #is_a?, iterator?, #kind_of?, lambda, load, load_bridge_support_file, load_plist, local_variables, loop, #method, #methodForSelector:, #methodSignatureForSelector:, #methods, #mutableCopy, mutableCopyWithZone:, new, #nil?, open, p, #performSelector:onThread:withObject:waitUntilDone:, #performSelector:onThread:withObject:waitUntilDone:modes:, #performSelector:withObject:afterDelay:, #performSelector:withObject:afterDelay:inModes:, #performSelectorInBackground:withObject:, #performSelectorOnMainThread:withObject:waitUntilDone:, #performSelectorOnMainThread:withObject:waitUntilDone:modes:, print, printf, #private_methods, proc, #protected_methods, #public_method, #public_methods, #public_send, putc, puts, raise, rand, readline, readlines, #replacementObjectForCoder:, #replacementObjectForKeyedArchiver:, require, resolveClassMethod:, resolveInstanceMethod:, #respond_to?, #respond_to_missing?, select, #send, setVersion:, #singleton_methods, sprintf, srand, superclass, #taint, #tainted?, #tap, test, throw, #to_plist, #to_s, trace_var, trap, #trust, #untaint, untrace_var, #untrust, #untrusted?, version

Constructor Details

This class inherits a constructor from NSObject

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class NSObject

Instance Attribute Details

- (String) activityType (readonly)

The type of the activity object that is expecting the data. (read-only) The value of this property is nil until the user selects an activity. At that time, the value is set and the provider object is submitted to a queue for execution. Thus, you should access this value only after your object’s item method is called.

Returns:

- (Object) placeholderItem (readonly)

The placeholder object you specified at initialization time. (read-only)

Returns:

Instance Method Details

- (Object) initWithPlaceholderItem(placeholderItem)

Initializes and returns a provider object with the specified placeholder data.

Parameters:

  • placeholderItem (Object) —

    An object that can stand in for the actual object you plan to create. The contents of the object may be empty but the class of the object must match the class of the object you plan to provide later.

Returns:

  • (Object) —

    An initialized provider object.

- (Object) item

Generates and returns the actual data object. When the actual data object is required, this method is called by the provider object’s infrastructure. Subclasses must override this method and use it to perform whatever work is required to create the data object and return it. You implement this method instead of the normal main method you would implement for operation objects. This method is called on a secondary thread of your app.

Returns: