2014/10/15 下午 10:05:22

iphone Programming Glossary: complexity

Practical rules for premature optimization [closed]

http://stackoverflow.com/questions/2978460/practical-rules-for-premature-optimization

cases that are completely inappropriate. For example I've seen a growing number of people say not to worry about the complexity of an algorithm because that's premature optimization eg http stackoverflow.com questions 2190275 help sorting an nsarray.. is just laziness and appalling to disciplined computer science. But it has occurred to me that maybe considering the complexity and performance of algorithms is going the way of assembly loop unrolling and other optimization techniques that are now.. that are now considered unnecessary. What do you think Are we at the point now where deciding between an O n^n and O n complexity algorithm is irrelevant What about O n vs O n n What do you consider premature optimization What practical rules do you..

What's the best approach for parsing XML/'screen scraping' in iOS? UIWebview or NSXMLParser?

http://stackoverflow.com/questions/3541615/whats-the-best-approach-for-parsing-xml-screen-scraping-in-ios-uiwebview-or

this I think. As you already mention it will not be lightweight though. Depending on the data that you want and the complexity of the pages that you need to parse you might also be able to parse it by using regular expressions or even a hand written..

Can somebody explain the process of a UIViewController birth (which method follows which)?

http://stackoverflow.com/questions/5107604/can-somebody-explain-the-process-of-a-uiviewcontroller-birth-which-method-follo

subview layout instead of relying on Cocoa's default autoresizing methods. 5. Putting it all together Because of the complexity there are many different ways for this process to occur but a normal timeline could look something like this viewController..

Creating a JSON Store For iPhone

http://stackoverflow.com/questions/5237943/creating-a-json-store-for-iphone

and even optional function of Core Data. The major modeling persistence concerns are the size of the data and the complexity of the data. So the relative strengths and weaknesses of each type of persistence would break down like this _______________________________.. Complexity To which we could add a third lessor dimension volatility i.e. how often the data changes 1 If the size complexity and volatility of the data are low then using a collection e.g. NSArray NSDictionary NSSet of a serialized custom object.. option. Collections must be read entirely into memory so that limits their effective persistence size. They have no complexity management and all changes require rewriting the entire persistence file. 2 If the size is very large but the complexity..

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

framework. Previous answer for posterity As with any performance related question the answer will depend on the complexity of your filters the image size being filtered and the performance characteristics of the device you're running on. Because..

Basic HTTP Authentication on iPhone

http://stackoverflow.com/questions/993409/basic-http-authentication-on-iphone