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2014/10/15 ¤U¤È 10:12:22
iphone Programming Glossary: optimizeHow would I tint an image programatically on the iPhone? http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone self.overlayColor.CGColor CGContextFillRect context self.bounds CGContextRestoreGState context Ordinarily to optimize the drawing you would restrict the actual drawing to only the area passed in to drawRect but since the background image..
http://stackoverflow.com/questions/14659563/to-drawrect-or-not-to-drawrect-when-should-one-use-drawrect-core-graphics-vs-su to fully understand the when's and why's to use one over the other. I also understand that it doesn't make sense to optimize that much ahead of time and do something the more difficult way before doing any profiling. Consider that I'm comfortable.. should be a separate layer. The other problem is that when you don't do custom drawing with drawRect UIKit can optimize stock views so drawRect is a no op or it can take shortcuts with compositing. When you override drawRect UIKit has to take.. a complex hierarchy UIKit's drawRect optimizations become less important. So the bottleneck becomes how much you can optimize your Core Graphics drawing. Whenever you can use UIKit. Do the simplest implementation that works. Profile. When there's..
How can I skip compressing one PNG? http://stackoverflow.com/questions/2051947/how-can-i-skip-compressing-one-png Note I have solved this problem but it took long enough that I'm posting question answer here. The Xcode build process optimizes my PNGs when building. This isn't usually a problem but iTunesArtwork being processed in this way causes corrupts it so.. question You can read more about Xcode's PNG compression here http iphonedevelopment.blogspot.com 2008 10 iphone optimized pngs.html While you can turn off PNG optimization compression entirely using Compress PNG Files in your project settings.. the gist of it is that the optimization lets the iPhone skip some math that slows down PNG display. Xcode will only optimize PNG image files that it knows about. To prevent a specific PNG from being optimized you change its file type so Xcode no..
camera overlay view - just for preview? http://stackoverflow.com/questions/2081872/camera-overlay-view-just-for-preview
How to reduce the size of my iPhone application? http://stackoverflow.com/questions/2490910/how-to-reduce-the-size-of-my-iphone-application compression ipa share improve this question PNG is really the best option for lossless image compression. You can optimize your PNGs for size using PNGOUT but may I inquire which files specifically are taking much space How does it compare to..
iPhone - dequeueReusableCellWithIdentifier usage http://stackoverflow.com/questions/2928873/iphone-dequeuereusablecellwithidentifier-usage usage I'm working on a iPhone app which has a pretty large UITableView with data taken from the web so I'm trying to optimize its creation and usage. I found out that dequeueReusableCellWithIdentifier is pretty useful but after seeing many source..
Drawing shadow with Quartz is slow on iPhone & iPad. Another way? http://stackoverflow.com/questions/3677564/drawing-shadow-with-quartz-is-slow-on-iphone-ipad-another-way shadow share improve this question You should set the shadowPath property . It is how CoreGraphics is able to optimize shadows. For example if your view is an opaque rectangle self.contentView.layer.shadowPath UIBezierPath bezierPathWithRect..
UISearchDisplayContoller ??can't prevent table reload on typing in search bar http://stackoverflow.com/questions/3903718/uisearchdisplaycontoller-cant-prevent-table-reload-on-typing-in-search-bar if when the search filter is complete. I defined this as an add on to option 1 as they can be done together though to optimize things you may not care about showing search activity in the searchResultsTableView if you are hiding the table and showing..
How do I retrieve a page number or page reference for an Outline destination in a PDF on iOS? http://stackoverflow.com/questions/4643489/how-do-i-retrieve-a-page-number-or-page-reference-for-an-outline-destination-in could also traverse the page tree which is a bit harder but may be faster not as much as you might expect I wouldn't optimize prematurely here . The other items in the array are position on the page etc. search for Explicit Destinations in the PDF..
Repeating NSTimer, weak reference, owning reference or iVar? http://stackoverflow.com/questions/4945028/repeating-nstimer-weak-reference-owning-reference-or-ivar
How can I optimize the rendering of a large model in OpenGL ES 1.1? http://stackoverflow.com/questions/5718846/how-can-i-optimize-the-rendering-of-a-large-model-in-opengl-es-1-1 can I optimize the rendering of a large model in OpenGL ES 1.1 I just finished implementing VBO's in my 3D app and saw a roughly 5 10x.. which might cut down on geometry by eliminating some redundant vertices. The PowerVR GPUs in the iOS devices are optimized for using indexed geometry as well. Try using a smaller data type for your vertex information. I found that I could use..
What's the easiest way to resize/optimize an image size with the iPhone SDK? http://stackoverflow.com/questions/612131/whats-the-easiest-way-to-resize-optimize-an-image-size-with-the-iphone-sdk the easiest way to resize optimize an image size with the iPhone SDK My application is downloading a set of image files from the network and saving them to..
http://stackoverflow.com/questions/6488732/how-does-one-compare-one-image-to-another-to-see-if-they-are-similar-by-a-certai at this answer for an idea of how to determine the color of a pixel at a given position in an image. You may want to optimize it somewhat to better suit your use case repeatedly querying the same image but it should provide a good starting point...
Better performance with libxml2 or NSXMLParser on the iPhone? http://stackoverflow.com/questions/826281/better-performance-with-libxml2-or-nsxmlparser-on-the-iphone what do you prefer for optimal performance I'm currently using TouchXML libxml2 and looking to see if it's possible to optimize on the parsing speeds as is. Thanks for your feedback iphone objective c xml cocoa touch share improve this question..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons The compiler inserts retains and releases in all the places you should have anyway. But it's smarter than you and can optimize out the ones that aren't actually needed just like it can unroll loops eliminate temporary variables inline functions etc...
NSURLConnection is run many times http://stackoverflow.com/questions/886810/nsurlconnection-is-run-many-times them to. The cost of creating the objects themselves is trivial on the order of once per 5s and you shouldn't try to optimize that though of course you should reuse the NSURL . It's the opening a connection to the server that's expensive especially..
Is there any open source OCR project for the iPhone out there? http://stackoverflow.com/questions/964181/is-there-any-open-source-ocr-project-for-the-iphone-out-there
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