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2014/10/15 ¤U¤È 10:03:34
iphone Programming Glossary: allocatesDisadvantage of using NSMutableArray vs NSArray? http://stackoverflow.com/questions/1746204/disadvantage-of-using-nsmutablearray-vs-nsarray get the best performance from NSMutableArray s arrayWithCapacity method and adding objects to it until full so it allocates all the memory at once if it can. Behind the scenes they're secretly the same thing NSArray and NSMutableArray are both..
Memory leak tool tells me zero leaks but memory footprint keeps rising http://stackoverflow.com/questions/2339279/memory-leak-tool-tells-me-zero-leaks-but-memory-footprint-keeps-rising given back to OS after deallocation. This is a common design for C runtimes. When you do an allocation the C runtime allocates more memory for its use and returns a chunk of it for you to use. When you do a free the C runtime simply marks it as deallocated..
CGContextDrawPDFPage taking up large amounts of memory http://stackoverflow.com/questions/2975240/cgcontextdrawpdfpage-taking-up-large-amounts-of-memory to be around 100px tall the application crashes while drawing one page in particular which according to Instruments allocates about 13 MB of memory just for the one page. Here's the code for drawing Note This is always called in a background thread..
why most of the objects we create in iphone are pointers http://stackoverflow.com/questions/3044292/why-most-of-the-objects-we-create-in-iphone-are-pointers C has in place and since stack allocated objects live only in the scope in which they are created one usually allocates objects on the heap anyway and so there would be marginal benefit in supporting objects as stack allocated values. As a..
http://stackoverflow.com/questions/3433274/objective-c-autorelease
UITableView dequeueReusableCellWithIdentifier Theory http://stackoverflow.com/questions/3552343/uitableview-dequeuereusablecellwithidentifier-theory could somehow reuse my cells instead of allocating I think I might get a better performance. My own theory is that it allocates the four cells simply because it has too . When a cell disappears from the screen it will be put in the TableView reuse..
Request a DepthBuffer in OpenGL ES for iPhone http://stackoverflow.com/questions/4361516/request-a-depthbuffer-in-opengl-es-for-iphone GL_RENDERBUFFER depthRenderbuffer Which does what it looks like it does generates and binds a render buffer allocates it storage to be a 16bit depth buffer of the same dimensions as the colour buffer and then attaches it to the frame buffer...
iOS Development: How can I induce low memory warnings on device? http://stackoverflow.com/questions/4717138/ios-development-how-can-i-induce-low-memory-warnings-on-device so much iphone ipad ios share improve this question To test on a device just add some code that periodically allocates large chunks of memory without freeing it i.e. leak on purpose . You can do this in a separate thread or in response to..
IOS 4.3 UINavigationBar tintColor Leaks http://stackoverflow.com/questions/5383090/ios-4-3-uinavigationbar-tintcolor-leaks objective c ios4.3 share improve this question Ive had this issue before 4.2 i think colourWithRed Green blue allocates a new UIColor object which your responsible for managing. The solution is to create an instance for your tint colour and..
Memory limit and iOS memory allocation in iphone SDK? http://stackoverflow.com/questions/6044147/memory-limit-and-ios-memory-allocation-in-iphone-sdk allocation in iphone SDK Does iOs use non contiguous or contiguous allocation in memory management suppose if user allocates more than 128 MB Will the App be closed or Memory will be managed by iOS as if user allocates memory and misses deallocate.. suppose if user allocates more than 128 MB Will the App be closed or Memory will be managed by iOS as if user allocates memory and misses deallocate in Deallocate method is it possible to use more than 120 MB in application using well defined..
Some beginner Objective-C/iPhone questions http://stackoverflow.com/questions/710568/some-beginner-objective-c-iphone-questions the str variable. You do not need to retain or release string constants. str NSString alloc initWithString @ Hi there allocates a new string instance. The value of str will be the address of this instance. Each call of str NSString alloc initWithString..
What is the difference between these two ways of allocating memory in Objective-C? http://stackoverflow.com/questions/8211075/what-is-the-difference-between-these-two-ways-of-allocating-memory-in-objective init or NSMutableDictionary alpha NSMutableDictionary dictionary What is the difference between them I know the first allocates memory for alpha but what about the second Which of these is recommended as the best practice for allocating memory iphone..
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