每次调用都非常简单的方法来分配和释放内存

Question

I have the following method that is called when the delete button is pressed in an IOS keyboard app extension:

func delete()
    {
        dispatch_async(dispatch_get_main_queue(),
            {
                for _ in 1..<50
                {
                    (self.textDocumentProxy as UIKeyInput).deleteBackward()
                }
                print("Deletion End")
        })
}

However, each time this method is called my keyboard's memory usage goes up by 1-2mb and it does not come back down. This quickly results in a crash.

I am not allocating or de-allocating any objects in this thread, so I am not sure why there is a massive memory leak.

UPDATE:

I changed dispatch_get_main_queue() to a static variable:

let mainqueue = dispatch_get_main_queue()

and used mainqueue inplace of dispatch_get_main_queue but this did not do anything.

UPDATE 2:

I added a variable called tempProxy that is created each time delete is called:

let tempProxy = (self.textDocumentProxy as UIKeyInput) Then in dispatch_async I used this:

tempProxy.deleteBackward()

I did this because I heard that having references to self could cause memory retention.

UPDATE 3:

I changed:

(self.textDocumentProxy as UIKeyInput).deleteBackward()

to a print() statement.

The memory usage was now a lot less. However, I was confused as to why the memory was still not being released.

Answer 1

原来我启用了NSZombie对象，每次我调用deleteBackward()时，它都会永久增加内存