아이폰 앱 개발 팁(9) : Stanford Lecture #10

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> Stanford Lecture #10

* Finding (memory) leaks

* Typical NSThread use case

- (void)someAction:(id)sender{

// Fire up a new thread

[NSThread detachNewThreadSelector:@selector(doWork:) withTarget:self object:someData];

}

- (void)doWork:(id)someData{

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

[someData doLotsOfWork];

// Message back to the main thread

[self performSelectorOnMainThread:@selector(allDone:) withObject:[someData result] waitUntilDone:NO];

[pool release];

}

* NSLock and subclasses

- (void)someMethod{

[myLock lock];

// We only want one thread executing this code at once

[myLock unlock];

}

* Conditions

// On the producer thread

- (void)produceData{

[condition lock];

newDataExists = YES;

[condition signal];

[condition unlock];

}

// On the consumer thread

- (void)consumeData{

[condition lock];

while(!newDataExists){

[condition wait];

}

newDataExists = NO;

[condition unlock];

}

* Define a custom init method

- (id)initWithSomeObject:(id)someObject{

self = [super init];

if(self){

self.someObject = someObject;

}

return self;

}

* Override - main method to do work

- (void)main{

[someObject doLotsOfTimeConsumingWork];

}

* Using an NSInvocationOperation

- (void)someAction:(id)sender{

NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(doWork:) object:someObject];

[queue addObject:operation];

[operation release];

}