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2014/10/15 ¤U¤È 10:14:16
iphone Programming Glossary: slowerDelete/Reset all entries in Core Data? http://stackoverflow.com/questions/1077810/delete-reset-all-entries-in-core-data store back to ensure it is recreated properly. The programmatic way for iterating through each entity is both slower and prone to error. The use for doing it that way is if you want to delete some entities and not others. However you still..
http://stackoverflow.com/questions/11486828/table-view-scrolling-async make sure cell you get from cellForRowAtIndexPath is not null because if cell loading logic gets too backed up esp on slower devices you could theoretically have the cell in question having scrolled off the screen and your algorithm could crash..
Pre-release checklist before building final version for App Store http://stackoverflow.com/questions/1480044/pre-release-checklist-before-building-final-version-for-app-store does the music continue to play Do your sounds mix properly or fade the music appropriately Test performance on a slower devices with limited RAM such as iPhone 3G 128MB RAM 412Mhz CPU or iPod Touch 1st or 2nd gen . Run the Clang static analyzer..
http://stackoverflow.com/questions/1622729/double-vs-float-on-the-iphone vs float on the iPhone I have just heard that the iphone cannot do double natively thereby making them much slower that regular float. Is this true Evidence I am very interested in the issue because my program needs high precision calculations..
How can I encrypt CoreData contents on an iPhone http://stackoverflow.com/questions/1645007/how-can-i-encrypt-coredata-contents-on-an-iphone Depending on the encryption used I would even expect that the on disk data accesses for loading each entity would be slower than the decryption process for the properties so you won't see that much of a performance penalty when accessing the properties...
Detect the specific iPhone/iPod touch model in Javascript http://stackoverflow.com/questions/3093899/detect-the-specific-iphone-ipod-touch-model-in-javascript i devices which uses HTML5 webkit features like transitions but I want to disable some of the fancy stuff for older slower iPhone models like iPhone 3GS and iPod touch 3rd Gen because on those devices the transitions are too slow. Is there a way..
streaming video FROM an iPhone http://stackoverflow.com/questions/3444791/streaming-video-from-an-iphone in between if the connection is fast enough saving battery life. Conversely if the connection is slow so upload is slower than recording managing delayed upload of a set of files is much easier than a stream of bytes. share improve this answer..
differences between uiwebview and mobile safari http://stackoverflow.com/questions/3496505/differences-between-uiwebview-and-mobile-safari share improve this question It doesn't have the Nitro Javascript engine. This makes executing Javascript much slower in UIWebView compared to Safari. http www.tuaw.com 2011 03 18 apple confirms some webkit optimizations unavailable to ios..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone what I learned while trying to get this working anyway. iOS 5 update When the result block fires seems to be a bit slower with iOS5 maybe single core devices so I couldnt rely on the image to be available directly after calling findLargeImage..
When to use PNG or JPG in iPhone development? http://stackoverflow.com/questions/3929281/when-to-use-png-or-jpg-in-iphone-development to display. However large PNGs may take longer to read from storage than more compressed image formats and thus be slower to display. JPG's are smaller to store but lossy amount depends on compression level and to display them requires a much..
Core data, how to get NSManagedObject's ObjectId when NSFetchRequest returns NSDictionaryResultType? http://stackoverflow.com/questions/3956406/core-data-how-to-get-nsmanagedobjects-objectid-when-nsfetchrequest-returns-nsd this dictionary Otherwise I will need to run the query with a return type of NSManagedObjectResultType which is much slower for a large number of returned items. iphone core data ios nsfetchrequest share improve this question Yes you can using..
Iphone - when to calculate heightForRowAtIndexPath for a tableview when each cell height is dynamic? http://stackoverflow.com/questions/4823197/iphone-when-to-calculate-heightforrowatindexpath-for-a-tableview-when-each-cel can be called for every row in the table quite frequently. This contrasts with cellForRowAtIndexPath which is often slower and more memory intensive but is only called for the rows that are actually need to be displayed at any given time. Why..
Invoke native date picker from web-app on iOS/Android http://stackoverflow.com/questions/4946919/invoke-native-date-picker-from-web-app-on-ios-android quick flashing of the keyboard on iOS and things can be even more confusing on first usage as then the date picker is slower. One can fully disable the regular keyboard by making the input readonly if one is using the plugin but that disables the..
Objective-C++ for iOS development http://stackoverflow.com/questions/5090968/objective-c-for-ios-development
How can I improve the performance of my custom OpenGL ES 2.0 depth texture generation? http://stackoverflow.com/questions/6051237/how-can-i-improve-the-performance-of-my-custom-opengl-es-2-0-depth-texture-gener of this depth texture is a bottleneck in my rendering process and I'm looking for a way to make it faster. It seems slower than it should be but I can't figure out why. In order to achieve the proper generation of this depth texture GL_DEPTH_TEST..
Are the Core Image filters in iOS 5.0 fast enough for realtime video processing? http://stackoverflow.com/questions/6625888/are-the-core-image-filters-in-ios-5-0-fast-enough-for-realtime-video-processing compatible devices out there would be the iPhone 3G S and the 3rd generation iPod touch but they're not that much slower than the iPhone 4. The iPad 2 blows them all away with its massive fragment processing power. share improve this answer..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown possible to build up an NSMethodInvocation to handle this as well but doing so requires a lot more typing and is also slower so there's little reason to do it. 1 All Objective C methods have two hidden arguments self and _cmd that are implicitly..
Most efficient way to draw part of an image in iOS http://stackoverflow.com/questions/8035673/most-efficient-way-to-draw-part-of-an-image-in-ios levels. Anyway at least for optimization of UI stuff it's incredibly hard to be better than Apple. Why your method is slower than UIImageView What you should know is all about GPU acceleration. In all of the recent computers fast graphics performance.. intention of CGImage seems to be for CPU. So it seems to be done in CPU. Graphics operations done in CPU are a lot slower than in GPU. Simply clipping an image and compositing the image layers are very simple and cheap operations for GPU compared..
http://stackoverflow.com/questions/8723923/core-data-vs-sqlite-or-fmdb to simplify displaying it in various iOS and Mac OS X UI widgets. There are a few applications where Core Data will be slower than an equivalent SQLite DB. Those have been detailed elsewhere. The one major claim is that tasks where IDs are defined..
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