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2014/10/15 ¤U¤È 10:14:12
iphone Programming Glossary: significantUse CoreData or SQLite on iPhone? [closed] http://stackoverflow.com/questions/1318467/use-coredata-or-sqlite-on-iphone object models. You get undo redo support almost for free with it. It also provides some very significant performance benefits particularly on the iPhone. Even though it seems counterintuitive given how much..
iPhone Landscape FAQ and Solutions http://stackoverflow.com/questions/2953351/iphone-landscape-faq-and-solutions the first view controller loaded from the main nib is always displayed correct. I have spent a significant amount of time investigating this issue and finally found a solution that is not only a partial solution..
http://stackoverflow.com/questions/3760924/set-line-height-in-uitextview
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints prevents using it to create a real time render of new zoom levels. CATiledLayer Method Theres a significant Overhead time drawing a full PDF page to a CALayer individual tiles can be seen rendering even with..
Do you need to create an NSAutoreleasePool within a block in GCD? http://stackoverflow.com/questions/4141123/do-you-need-to-create-an-nsautoreleasepool-within-a-block-in-gcd if you are only allocating a few objects don't worry about it. However if you are allocating any significant number of objects and since you are targeting a memory constrained environment then you should be creating..
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 exception should be very close in time to the termination of your program. If you're catching a significant number of ObjC exceptions you're using them incorrectly. This is fixable using fobjc arc exceptions.. So my point is that the underlying memory management is still important but where I used to spend significant time stating and restating the rules for new programmers with ARC it is becoming a more advanced topic...
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 I have some code in this answer that I've used for raw pixel extraction. It also experiences a significant speedup in practice when compared to using glReadPixels although less than I see with the pixel buffer..
Use CoreData or SQLite on iPhone? [closed] http://stackoverflow.com/questions/1318467/use-coredata-or-sqlite-on-iphone Core Data can greatly simplify your code particularly for complex object models. You get undo redo support almost for free with it. It also provides some very significant performance benefits particularly on the iPhone. Even though it seems counterintuitive given how much overhead you'd think the framework has in most cases you can..
iPhone Landscape FAQ and Solutions http://stackoverflow.com/questions/2953351/iphone-landscape-faq-and-solutions via CoreGraphics while others build on the observation that the first view controller loaded from the main nib is always displayed correct. I have spent a significant amount of time investigating this issue and finally found a solution that is not only a partial solution but should work under all these circumstances. It is my..
http://stackoverflow.com/questions/3760924/set-line-height-in-uitextview
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints memory hit on generating the UIImages from a PDFcontext limits prevents using it to create a real time render of new zoom levels. CATiledLayer Method Theres a significant Overhead time drawing a full PDF page to a CALayer individual tiles can be seen rendering even with a tileSize tweak CALayers cant be prepared ahead of time rendered..
Do you need to create an NSAutoreleasePool within a block in GCD? http://stackoverflow.com/questions/4141123/do-you-need-to-create-an-nsautoreleasepool-within-a-block-in-gcd processed it may be after hundreds but probably won't be . So if you are only allocating a few objects don't worry about it. However if you are allocating any significant number of objects and since you are targeting a memory constrained environment then you should be creating and draining pools. The documentation has been updated...
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 ARC will leak memory during ObjC exception throws. An ObjC exception should be very close in time to the termination of your program. If you're catching a significant number of ObjC exceptions you're using them incorrectly. This is fixable using fobjc arc exceptions but it incurs the penalties discussed below ARC will not leak.. . And blocks... well block memory management is just weird. So my point is that the underlying memory management is still important but where I used to spend significant time stating and restating the rules for new programmers with ARC it is becoming a more advanced topic. I'd rather get new developers thinking in terms of object..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 make the movie. Aside from the use of this in an AVAssetWriter I have some code in this answer that I've used for raw pixel extraction. It also experiences a significant speedup in practice when compared to using glReadPixels although less than I see with the pixel buffer pool I use with AVAssetWriter. It's a shame that none of..
Should I be worried about rumors that Apple will stop using Google Maps in iOS6? [closed] http://stackoverflow.com/questions/10964585/should-i-be-worried-about-rumors-that-apple-will-stop-using-google-maps-in-ios6 and stressed out about pushing the release date as any further delay will affect many of my other plans in a very significant way. More information on the app It provides real time public transit information based on information it obtains from a..
Use CoreData or SQLite on iPhone? [closed] http://stackoverflow.com/questions/1318467/use-coredata-or-sqlite-on-iphone particularly for complex object models. You get undo redo support almost for free with it. It also provides some very significant performance benefits particularly on the iPhone. Even though it seems counterintuitive given how much overhead you'd think..
iPhone Landscape FAQ and Solutions http://stackoverflow.com/questions/2953351/iphone-landscape-faq-and-solutions on the observation that the first view controller loaded from the main nib is always displayed correct. I have spent a significant amount of time investigating this issue and finally found a solution that is not only a partial solution but should work..
NSThread vs. NSOperationQueue vs. ??? on the iPhone http://stackoverflow.com/questions/3041837/nsthread-vs-nsoperationqueue-vs-on-the-iphone any reason to switch 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..
Can I mix OpenglES with standard Cocoa widgets on an iPhone app? http://stackoverflow.com/questions/3057529/can-i-mix-opengles-with-standard-cocoa-widgets-on-an-iphone-app
What are the advantages of armv7 over armv6 when compiling iPhone apps? http://stackoverflow.com/questions/3310907/what-are-the-advantages-of-armv7-over-armv6-when-compiling-iphone-apps If you're doing it in double precision but don't necessarily need that amount of precision you can probably get a significant performance boost on armv7 devices by using single precision instead. Apple covered a lot of the differences between armv6..
Behaviour for significant change location API when terminated/suspended? http://stackoverflow.com/questions/3421242/behaviour-for-significant-change-location-api-when-terminated-suspended for significant change location API when terminated suspended This is the section from the CLLocationManager documentation describing the.. test harness that you are welcome to download and try out. It is a pretty simple app that allows you to turn on significant change and gps change APIs through the UI and log all the responses that you get back. N.B. Point six in the previous answer..
http://stackoverflow.com/questions/3760924/set-line-height-in-uitextview
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints a PDFcontext limits prevents using it to create a real time render of new zoom levels. CATiledLayer Method Theres a significant Overhead time drawing a full PDF page to a CALayer individual tiles can be seen rendering even with a tileSize tweak CALayers..
Do you need to create an NSAutoreleasePool within a block in GCD? http://stackoverflow.com/questions/4141123/do-you-need-to-create-an-nsautoreleasepool-within-a-block-in-gcd won't be . So if you are only allocating a few objects don't worry about it. However if you are allocating any significant number of objects and since you are targeting a memory constrained environment then you should be creating and draining..
How to use Keychain access to store passwords in iPhone App? http://stackoverflow.com/questions/4143240/how-to-use-keychain-access-to-store-passwords-in-iphone-app As I wrote above its functionality could be duplicated with a better API without much effort. The encryption part is significant though since its primary purpose is to keep keys and passwords safe. A DIY key database could be protected by encrypting..
iOS Multi-Tasking Track GPS Location http://stackoverflow.com/questions/4400628/ios-multi-tasking-track-gps-location better off using the startMonitoringSignificantLocationChanges method on a CLLocationManager. Then you get suitably significant location updates even when in the background without being a full on background app. Other parts of the documentation state..
Breakdown of iOS versions being used [closed] http://stackoverflow.com/questions/5291823/breakdown-of-ios-versions-being-used all the new features in the latest major version . One final very minor point the hard approach to upgrading is a significant barrier to A idiots who try to steal your software and B hacking and viruses. Observe any recent virus fiasco in the 'android'..
UIScrollView : paging horizontally, scrolling vertically? http://stackoverflow.com/questions/728014/uiscrollview-paging-horizontally-scrolling-vertically to be handled or to be forwarded UIScrollView starts a timer when you first touch it If you haven't moved your finger significantly within 150ms it passes the event on to the inner view. If you have moved your finger significantly within 150ms it starts.. moved your finger significantly within 150ms it passes the event on to the inner view. If you have moved your finger significantly within 150ms it starts scrolling and never passes the event to the inner view . Note how when you touch a table which.. view and start scrolling immediately the row that you touched is never highlighted. If you have not moved your finger significantly within 150ms and UIScrollView started passing the events to the inner view but then you have moved the finger far enough..
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 throws. An ObjC exception should be very close in time to the termination of your program. If you're catching a significant number of ObjC exceptions you're using them incorrectly. This is fixable using fobjc arc exceptions but it incurs the penalties.. is just weird. So my point is that the underlying memory management is still important but where I used to spend significant time stating and restating the rules for new programmers with ARC it is becoming a more advanced topic. I'd rather get new..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 in an AVAssetWriter I have some code in this answer that I've used for raw pixel extraction. It also experiences a significant speedup in practice when compared to using glReadPixels although less than I see with the pixel buffer pool I use with AVAssetWriter...
iOS background application network access http://stackoverflow.com/questions/9613357/ios-background-application-network-access squarely within one of the allowable background models. However I need to post to a network service when there are significant changes of location. I've seen write ups that state network access is prohibited in background processing but I didn't read..
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