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-(void)performSelector:(SEL)message withObject:(id)arg afterDelay:(NSTimeInterval)delay -(void)performSelectorOnMainThread:(SEL)message withObject:(id)arg waitUntilDone:(BOOL)wait
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Queues a message that will be sent to the receiver in the current thread. The message is not queued until after delay seconds have elapsed. Queues a message that will be sent to the receiver on the main thread. If wait is YES, the call will suspend the current thread until the method has finished executing. Queues a message that will be sent to the receiver on the run loop attached to a specified thread. If wait is YES, the call will suspend the current thread until the method has finished executing. Creates and starts a new thread. When the new thread begins executing, the message and arg argument are sent to the receiver which executes in that thread. When the method returns, the thread terminates.
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-(void)performSelector:(SEL)message onThread:(NSThread*)thread withObject:(id)arg waitUntilDone:(BOOL)wait
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-(void)performSelectorInBackground:(SEL)message withObject:(id)arg
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The -performSelector:withObject:afterDelay: method pushes the message event onto the run loop of the currently running thread. The delay time is a floating-point value expressed in seconds. The run loop first waits for delay number of seconds to elapse then it queues the event to be executed at the next opportunity. The method does not guarantee the time the message will be sent, just that that message won t be sent any earlier than delay seconds in the future. To queue a message to be sent at the run loop s next opportunity, pass a delay of 0.0. The -performSelectorOnMainThread: and -performSelector:onThread: methods both queue a message to be executed on a particular thread. As described earlier, the main thread runs the primary run loop of the application. The -performSelectorOnMainThread: message is particularly useful to auxiliary threads that need to execute some action in the main thread (say, to update the value of a field in a window). Such methods must be performed on the main thread. The background thread can choose to send the message asynchronously
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CHAPTER 6 SENDING MESSAGES
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by passing NO in the wait argument, or suspend until the deferred message has completed by passing YES. The -performSelector:onThread: variant queues up a message to be executed on any thread with a run loop. If the target thread passed to this, or implied by the -performSelectorOnMainThread:, method is the same as the currently running thread, the message is immediately sent to the object (using -performSelector:) without any run loop involvement. All three of the previous methods have an alternate form that accepts an additional mode parameter. Run loops operate in modes. A mode is a filter that ignores certain events in the queue that aren t appropriate in the current mode. Read more about run loop modes in the Threads chapter. The final -performSelectorInBackground: method sends a message to an object in a newly created thread. This method does not use run loops. A thread is created for the sole purposes of executing the message, and is destroyed afterwards. All of these methods provide a single object identifier parameter that will be included with the message. If the method being invoked doesn t expect an argument, the value is ignored; set it to nil.
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Object-Oriented Method Invocation
The role of Java s java.lang.reflect.Method class is filled largely by NSMethodSignature and NSInvocation in Cocoa. These classes form a high-level, object-oriented, interface to the method s definition, and a means to invoke it. NSMethodSignature is an immutable description of the method s parameters and return type. NSInvocation encapsulates the receiver, message, parameter values, and return value that constitute an invocation of the method. Think of NSMethodSelector as the method s prototype and NSInvocation as the act of sending the message. While the simple -performSelector: methods are fast and easy to use, they lack flexibility. NSInvocation can deal with methods that take any kind or number of parameters. This includes everything from a single byte to an entire structure. To create an NSInvocation object you must first obtain the NSMethodSignature for the method. Any object will return the signature for one of its methods when sent a -methodSignatureForSelector: message. If you don t have a representative object, send the Class object an +instanceMethodSignatureForSelector: message. Once you ve obtained the NSMethodSignature for the method, create an NSInvocation object using +invocationWithMethodSignature:. The target, parameter values, and return value are set individually and persist in the NSInvocation object. This is different than Java. The Method object is passed the target object and all of the parameters in the call to invoke(), which retains no information about the invocation after it returns. NSInvocation parameter and return values are configured one at a time using -setArgument:atIndex:. Each parameter value is set by passing -setArgument:atIndex: the address of the parameter s value not the value to be passed. This is true even for object pointer values; pass a pointer to the object pointer, not the pointer itself. NSInvocation uses its knowledge of the parameter type to copy the value at that address into the parameter stream. Listing 6-8 demonstrates using NSInvocation to send an NSString object the -substring: message along with the functionally equivalent code in Java.
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