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2014/10/15 ¤U¤È 10:09:29
iphone Programming Glossary: gainhttp://stackoverflow.com/questions/11486828/table-view-scrolling-async which focus on how to use Instruments to identify performance bottlenecks and I found them to be very helpful to gain proficiency with Instruments. Here is my code. In viewDidLoad I initialize my image cache void initializeCache _imageCache..
http://stackoverflow.com/questions/14659563/to-drawrect-or-not-to-drawrect-when-should-one-use-drawrect-core-graphics-vs-su animated separately You have a relatively small view hierarchy so any perceived extra effort using CG isn't worth the gain You want to update pieces of the view without redrawing the whole thing The layout of your subviews needs to update when.. How Why is drawing in one custom view recommended for buttery smooth table cell scrolling yet Apple advises drawRect against for performance reasons in general What about simple background images when do you create them with CG vs using a resizable.. 20 different color variations. Any other cases Given my understanding in my answer below could the same performance gains for a table cell possibly be gained by effectively capturing a snapshot bitmap of your cell after your complex UIView render's..
NSThread vs. NSOperationQueue vs. ??? on the iPhone http://stackoverflow.com/questions/3041837/nsthread-vs-nsoperationqueue-vs-on-the-iphone away from NSThread GCD is a 4th option when it's released for the iPhone but unless there's a significant performance gain I'd rather stick with methods that work in most platforms. Based on @Jon Eric's advice I went with an NSOperationQueue NSOperation.. be happier with the way it keeps my code and my tests clean organized and happily asynchronous. A Would subclass again iphone nsthread nsoperationqueue grand central dispatch share improve this question In general you'll get better mileage..
How do I stream video from the iPhone http://stackoverflow.com/questions/3206478/how-do-i-stream-video-from-the-iphone to do it Or am I missing something iphone objective c cocoa touch share improve this question With iOS4 you can gain access to the raw video frames via AVCaptureVideoDataOutput. Once you have the frames its up to you to compress them package..
Alternative solutions for in-house iPhone enterprise app distribution http://stackoverflow.com/questions/3309835/alternative-solutions-for-in-house-iphone-enterprise-app-distribution authenticated. If it sees the local key file when the app launches it considers itself authenticated and never checks again. Whether you use one user account per person or one for the whole company is up to you. This style of distribution is very.. that the AppStore provides. Apple has accepted many apps onto the AppStore that use this method of authenticating against a remote server Skype is a perfect example . If you keep track of device UDID on the configuration server you can also.. likely never incur a cost if you build this on Google AppEngine as you will never go over the free quotas and you will gain the stability and scalability of Google's backend architecture. As this particular deployment is for managing an in house..
Create provisioning profile in iphone application http://stackoverflow.com/questions/368062/create-provisioning-profile-in-iphone-application to get your entrance into the club that can deploy apps onto phones. Create your mobile provisioning in the Portal you gain access to in 2. Build your apps using this mobile provisioning in various scenarios. Development AdHoc distribution deployment...
iPhone GCC / LLVM GCC or LLVM? http://stackoverflow.com/questions/3739783/iphone-gcc-llvm-gcc-or-llvm application. Go to GCC only if that fails for some reason. It's a simple switch to hit in your build settings to gain even a small amount of extra performance for free in your end application. LLVM Compiler 2.0 coming with Xcode 4 has full..
How safe is information contained within iPhone app compiled code? http://stackoverflow.com/questions/3919765/how-safe-is-information-contained-within-iphone-app-compiled-code iPhone app compiled code I was discussing this with some friends and we began to wonder about this. Could someone gain access to URLs or other values that are contained in the actual objective c code after they purchase your app Our initial..
Cannot view Quicktime movies over HTTPS in Safari or UIWebView http://stackoverflow.com/questions/4660189/cannot-view-quicktime-movies-over-https-in-safari-or-uiwebview share improve this question After experiencing the very same problem and symptoms I was able to gain access to the Apple Developer Forum thread mentioned here https devforums.apple.com message 361209#361209 The upshot of..
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 to run the actual application on the simulator or device. Not having to use the device to run the tests is a huge gain of time. It's the difference between 2 minutes and 5 seconds per run. without the need to create views or controllers when..
what is the difference between Delegate and Notification? http://stackoverflow.com/questions/5325226/what-is-the-difference-between-delegate-and-notification are usually a more appropriate way of handling things especially if you're creating a framework for others to use. You gain compile time checking for required methods when you use protocols with your delegates so you know when you compile if you're..
How to gain assignment access to CGRect elements when the CGRect is an instance variable http://stackoverflow.com/questions/5860755/how-to-gain-assignment-access-to-cgrect-elements-when-the-cgrect-is-an-instance to gain assignment access to CGRect elements when the CGRect is an instance variable @interface some_class some_parent @property..
http://stackoverflow.com/questions/5890499/pcm-audio-amplitude-values the surface settles back down to the zero position. What numbers you get from your PCM recording data depend on the gain of the system. With common 16 bit samples the range is from 32768 to 32767 for the largest possible excursion of a vibration.. largest possible excursion of a vibration that can be recorded without distortion clipping or overflow. Usually the gain is set a bit lower so that the maximum values aren't right on the edge of distortion. ADDED 8 bit PCM audio is often an..
Why doesn't @contenteditable work on the iPhone? http://stackoverflow.com/questions/723592/why-doesnt-contenteditable-work-on-the-iphone developer program and downloading that video from the WWDC videos page. If you sign up to be a Safari dev you also gain the privilege to submit your Website to their online iOS Web app gallery. Edit I've confirmed this works on my iPad running..
http://stackoverflow.com/questions/8501941/accessing-the-iphone-sms-file pass to AppStore is to find some exploitable bug in the iOS there must be a lot check out how jailbreaks are done to gain root access in your app. Then you would be able to access the data you want on a non jailbroken iPhone. But it will probably..
http://stackoverflow.com/questions/8723923/core-data-vs-sqlite-or-fmdb slow this over fetch strategy is particularly effective. You actually have a lot of RAM on these devices use it to gain performance. Yes I know this is an apparent contradiction to my above knock on portable business logic. But really code..
how to use sendAsynchronousRequest:queue:completionHandler: http://stackoverflow.com/questions/9270447/how-to-use-sendasynchronousrequestqueuecompletionhandler my connection requests complete if there is an interrupt. I have been following this example In it it explains how to gain more time if an interrupt occurs I understand what its doing.. but not how to apply it to this connection if you have any..
UIScrollView image/photo viewer with paging enabled and zooming http://stackoverflow.com/questions/975708/uiscrollview-image-photo-viewer-with-paging-enabled-and-zooming
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