2014/10/15 下午 10:10:41

iphone Programming Glossary: iteration

http://stackoverflow.com/questions/12168072/fragment-shader-average-luminosity

image had been reduced to a sufficiently small size I read the pixels from that back onto the CPU and did a last quick iteration over the remaining few to arrive at the final luminosity value. For a 640x480 video frame this process yields a luminosity..

Is it better to autorelease or release right after?

http://stackoverflow.com/questions/1283324/is-it-better-to-autorelease-or-release-right-after

really matter either way. Since autorelease simply means that the object will be released at the end of the current iteration of the run loop the object will get released either way. The biggest benefit of using autorelease is that you don't have..

How can I maintain display order in UITableView using Core Data?

http://stackoverflow.com/questions/1648223/how-can-i-maintain-display-order-in-uitableview-using-core-data

not consistently saving and reloading and something feels very off about this implementation aside from the wasteful iteration of all of my FFObjects . Thanks in advance for any advice you can lend. iphone uitableview sorting core data share improve..

My custom UI elements are not being updated while UIScrollView is scrolled

http://stackoverflow.com/questions/4109898/my-custom-ui-elements-are-not-being-updated-while-uiscrollview-is-scrolled

But my problem is that my spinning circle is still stopping on scrolling I suspect redrawing is halted until the next iteration of the main thread's run loop . So even if its angle is changed all the time it might not be redrawn... Any ideas what I..

Is there a way to make drawRect work right NOW?

http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now

still the bizarre progressive slow down problem So the overwhelming thing is this weird progressive slow down on each iteration for unknown reasons the time taken for a loop deceases. Note that this applies to both doing it properly background look..

Mysterious “progressive slowing” problem in run loop / drawRect

http://stackoverflow.com/questions/4786754/mysterious-progressive-slowing-problem-in-run-loop-drawrect

is cause because the code maintains a single CGLayer offscreenPrefabCGL that has its context modified in every iteration of the loop in paintActualGutsOfHugeImage . Because the sequence of operations in offscreenPrefabCGL's context grows with.. it is the solution proposed by @v01d. Flatten the layer. Instead of holding a single CGLayer copy the CGLayer on each iteration. This maintains a flat image in the Layer that is very fast to render. I Implemented 2 with good results. The first 100..

How do I detect a touch on a UIBezierPath and move a ball along that?

http://stackoverflow.com/questions/4854035/how-do-i-detect-a-touch-on-a-uibezierpath-and-move-a-ball-along-that

point on a cubic bezier curve on an iPhone . . I pasted it in below too. You will have to implement your own MCsim or iteration to find where it hit depending on your situation. That's not so hard. Fourthly as a footnote there's that new thing where..

Releasing renderInContext result within a loop

http://stackoverflow.com/questions/4970627/releasing-renderincontext-result-within-a-loop

with UIImage image someotherimage then the memory does not spike but is allocated and reduces on every iteration of the loop as I would expect due to the Autorelease pool. It doesn't crash And if I just comment out the renderInContext..

How to run and debug unit tests for an iPhone application

http://stackoverflow.com/questions/4989668/how-to-run-and-debug-unit-tests-for-an-iphone-application

or controllers when testing the model. The complete development and testing can focus on the model only in the first iteration. Once the model is cleared for integration the rest of the development can follow. To debug the xml parsing I can simply..

Grand Central Dispatch (GCD) vs. performSelector - need a better explanation

http://stackoverflow.com/questions/5225130/grand-central-dispatch-gcd-vs-performselector-need-a-better-explanation

sets up a timer to perform the aSelector message on the current thread 䏭 run loop at the start of the next run loop iteration. The timer is configured to run in the modes specified by the modes parameter. When the timer fires the thread attempts..

How to force a view to render itself?

http://stackoverflow.com/questions/5408234/how-to-force-a-view-to-render-itself

Swift provided an answer that manipulates the current run loop. His suggestion was to force the run loop through one iteration immediately after you call setNeedsDisplay using the following code NSRunLoop currentRunLoop runMode NSDefaultRunLoopMode..

Autorelease for beginners

http://stackoverflow.com/questions/5860639/autorelease-for-beginners

If you need to autorelease then do that and don't worry about the memory. If you're creating lots of objects in each iteration of a loop you might want to consider either using your own autorelease pool or creating said objects with alloc init so..

Understanding reference counting with Cocoa and Objective-C

http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c

is alerted of the call. The NSAutoreleasePool now knows that once it gets an opportunity after the current iteration of the event loop it can call release on the object. From our perspective as programmers it takes care of calling release..

Using UIPinchGestureRecognizer to scale uiviews in single direction

http://stackoverflow.com/questions/6759028/using-uipinchgesturerecognizer-to-scale-uiviews-in-single-direction

piece transform hScale vScale lastTouchPosition currentTouchLocation This will not store at each iteration the current hFloat and vFloat and instead rely on the fact that the gestureRecognizer will accumulate the overall scale..

Some beginner Objective-C/iPhone questions

http://stackoverflow.com/questions/710568/some-beginner-objective-c-iphone-questions

the receiver to the current NSAutoreleasPool . When the pool is drained usually at the end of the current run loop iteration or when the pool is manually drained the pool calls release on all instances in the pool. If this release drops the retain.. it may cause you to accumulate many unused instances in the pool before it is drained at the end of the run loop iteration. If you can use release instead of autorelease you generally should. Again see the Cocoa memory management share improve..

iPhone: Bonjour NSNetService IP address and port

http://stackoverflow.com/questions/938521/iphone-bonjour-nsnetservice-ip-address-and-port

will generate incorrect values for Intel processors. You need to use htons to fix that. As Andrew noted above the iteration should use the enhanced for loop. EDIT Added this As noted on another related thread the use of inet_ntoa is discouraged..

UITableView, having problems changing accessory when selected

http://stackoverflow.com/questions/974170/uitableview-having-problems-changing-accessory-when-selected

the notification reload the data but it didn't look too pretty it was like a non animated deselection but one run loop iteration late I suspect the only way to do it is as you suggest keeping a cache of references to the cells themselves. This shouldn't..