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2014/10/15 ¤U¤È 10:12:20
iphone Programming Glossary: oftenHow do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an an app that calculates your age in years given your birthday set from a UIDatePicker yet it was often off. This proves there was an inaccuracy but I can't figure out where it comes from can you iphone..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework the window ie 512 44Hz or n 2 bin 1 .idealFreq Actually there is an extra Bin Bin 0 which is often referred to as 'DC Offset'. It so happens that Bin 0 and Bin n 2 will always have complex component..
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring is because the length of each of the three NSAttributedString substrings will be changing often and so I would prefer not to use any calculations to re position 3 separate NSString objects. If it's..
Getting current device language in iOS? http://stackoverflow.com/questions/3910244/getting-current-device-language-in-ios actually return the current region of the device not the currently selected language. These are often one and the same. However if I am in North America and I set my language to Japanese my region will..
How do I reset after a UIScrollView zoom? http://stackoverflow.com/questions/448285/how-do-i-reset-after-a-uiscrollview-zoom I've seen the simulator handle the timing of autoreleases differently than on the device most often when threads are involved . The view scaling is an issue with UIScrollView I've run into though. During..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c declared weak in ARC or assign pre ARC to avoid retain loops since the delegate of an object often holds a strong reference to that object. For example a view controller is often the delegate of a view.. of an object often holds a strong reference to that object. For example a view controller is often the delegate of a view it contains. To define your own delegates you'll have to declare their methods..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud likely for longer than you need it. However if you do have a large image that you need to redraw often then there are alternatives although the one I would recommend primarily is to avoid redrawing that..
How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an 1 day in the past I am off by the same amount. Update I have an app that calculates your age in years given your birthday set from a UIDatePicker yet it was often off. This proves there was an inaccuracy but I can't figure out where it comes from can you iphone cocoa time nstimeinterval share improve this question Brief..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework pair of points represents a wave ie 512 complete waves within the window ie 512 44Hz or n 2 bin 1 .idealFreq Actually there is an extra Bin Bin 0 which is often referred to as 'DC Offset'. It so happens that Bin 0 and Bin n 2 will always have complex component 0 so A 0 .realp is used to store Bin 0 and A 0 .imagp is used..
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring that has three colours. The reason I don't use 3 separate NSStrings is because the length of each of the three NSAttributedString substrings will be changing often and so I would prefer not to use any calculations to re position 3 separate NSString objects. If it's possible using NSAttributedString how do I make the following..
Getting current device language in iOS? http://stackoverflow.com/questions/3910244/getting-current-device-language-in-ios share improve this question The solutions provided will actually return the current region of the device not the currently selected language. These are often one and the same. However if I am in North America and I set my language to Japanese my region will still be English United States . In order to retrieve the currently..
How do I reset after a UIScrollView zoom? http://stackoverflow.com/questions/448285/how-do-i-reset-after-a-uiscrollview-zoom autoreleasing a view or layer somewhere within your code. I've seen the simulator handle the timing of autoreleases differently than on the device most often when threads are involved . The view scaling is an issue with UIScrollView I've run into though. During a pinch zooming event UIScrollView will take the view you..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c notification The delegate property itself is typically declared weak in ARC or assign pre ARC to avoid retain loops since the delegate of an object often holds a strong reference to that object. For example a view controller is often the delegate of a view it contains. To define your own delegates you'll have to.. in ARC or assign pre ARC to avoid retain loops since the delegate of an object often holds a strong reference to that object. For example a view controller is often the delegate of a view it contains. To define your own delegates you'll have to declare their methods somewhere. There are two basic approaches discussed in the..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud to have a cached version of the image hanging around and likely for longer than you need it. However if you do have a large image that you need to redraw often then there are alternatives although the one I would recommend primarily is to avoid redrawing that large image . With respect to the general behavior of the cache..
iOS PNG Image rotated 90 degrees http://stackoverflow.com/questions/10307521/ios-png-image-rotated-90-degrees
UIView's frame, bounds, center, origin, when to use what? http://stackoverflow.com/questions/1071112/uiviews-frame-bounds-center-origin-when-to-use-what above is correct but just to expand on the question of under what context ... frame this is the property you most often use for normal iPhone applications. most controls will be laid out relative to the containing control so the frame.origin..
How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an amount. Update I have an app that calculates your age in years given your birthday set from a UIDatePicker yet it was often off. This proves there was an inaccuracy but I can't figure out where it comes from can you iphone cocoa time nstimeinterval..
http://stackoverflow.com/questions/1256887/clickable-links-in-uilabel and in this text are web hyperlinks in rounded rect when I click them UIWebView opens. What puzzles me is that they often have custom links for example if words starts with # it is also clickable and aplication responds by opening another view...
Iphone SDK dismissing Modal ViewControllers on ipad by clicking outside of it http://stackoverflow.com/questions/2623417/iphone-sdk-dismissing-modal-viewcontrollers-on-ipad-by-clicking-outside-of-it
Practical rules for premature optimization [closed] http://stackoverflow.com/questions/2978460/practical-rules-for-premature-optimization an O n^n and O n complexity algorithm is irrelevant What about O n vs O n n It depends on the size of n and how often your code will get called. If n is always less than 5 then the asymptotic performance is irrelevant. In this case the size..
ApplicationWillTerminate in iOS 4.0 http://stackoverflow.com/questions/3139588/applicationwillterminate-in-ios-4-0 background execution time from this method. So yes applicationWillTerminate will generally not be called very often in iOS 4. If you have to save data you should do so in both applicationWillTerminate and applicationDidEnterBackground ...
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework 512 complete waves within the window ie 512 44Hz or n 2 bin 1 .idealFreq Actually there is an extra Bin Bin 0 which is often referred to as 'DC Offset'. It so happens that Bin 0 and Bin n 2 will always have complex component 0 so A 0 .realp is used..
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring use 3 separate NSStrings is because the length of each of the three NSAttributedString substrings will be changing often and so I would prefer not to use any calculations to re position 3 separate NSString objects. If it's possible using NSAttributedString..
Getting current device language in iOS? http://stackoverflow.com/questions/3910244/getting-current-device-language-in-ios provided will actually return the current region of the device not the currently selected language. These are often one and the same. However if I am in North America and I set my language to Japanese my region will still be English United..
iPhone Development - XMLParser vs. libxml2 vs. TouchXML http://stackoverflow.com/questions/406811/iphone-development-xmlparser-vs-libxml2-vs-touchxml say 10 MB or bigger you may want to stick with SAX. If you're working with small XML files or tiny XML fragments it's often much easier to use DOM. If indeed you decide to go with DOM you've got a few options. libxml2 is a very powerful API written.. mainly for DOM style use but has other options if you become experienced with it. But as it's written in C it's not often attractive to those more familiar with Objective C objects and autorelease or those coming over from the .Net world. Thus..
How do I reset after a UIScrollView zoom? http://stackoverflow.com/questions/448285/how-do-i-reset-after-a-uiscrollview-zoom within your code. I've seen the simulator handle the timing of autoreleases differently than on the device most often when threads are involved . The view scaling is an issue with UIScrollView I've run into though. During a pinch zooming..
Creating a JSON Store For iPhone http://stackoverflow.com/questions/5237943/creating-a-json-store-for-iphone Collection Core Data 3 plist xml 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..
iPhone SDK: what is the difference between loadView and viewDidLoad? http://stackoverflow.com/questions/573958/iphone-sdk-what-is-the-difference-between-loadview-and-viewdidload all my views from code I do not and will not use Interface Builder should that make any difference. I've found that often when I add init code to loadView I end up with an infinite stack trace so I typically do all my child view building in viewDidLoad...but.. c share improve this question I can guess what might be the problem here because I've done it I've found that often when I add init code to loadView I end up with an infinite stack trace Don't read self.view in loadView. Only set it don't..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c itself is typically declared weak in ARC or assign pre ARC to avoid retain loops since the delegate of an object often holds a strong reference to that object. For example a view controller is often the delegate of a view it contains. To define.. loops since the delegate of an object often holds a strong reference to that object. For example a view controller is often the delegate of a view it contains. To define your own delegates you'll have to declare their methods somewhere. There are..
Steps to upload an iPhone application to the AppStore http://stackoverflow.com/questions/796482/steps-to-upload-an-iphone-application-to-the-appstore Accidentally leaving the build settings to Simulator can be a big reason for the pink rejection. And that happens more often than many developers would care to admit. Next make sure that you've chosen a build configuration that uses your distribution..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud hanging around and likely for longer than you need it. However if you do have a large image that you need to redraw often then there are alternatives although the one I would recommend primarily is to avoid redrawing that large image . With respect..
Maximum speed from IOS/iPad/iPhone http://stackoverflow.com/questions/11219240/maximum-speed-from-ios-ipad-iphone app provides bad user experience if installed on old device. Of course I use O3 flag I deleted dead code from OpenCV. Often when optimizing OpenCV I see code which is clearly not needed for my project. For example often there is a extra if to check..
Xcode fails with “Code Signing” Error http://stackoverflow.com/questions/13962341/xcode-fails-with-code-signing-error Archiving an app fails with code signing or expired signing certificates where a run or build work correctly. Often the project may have several configurations and sometimes only a subset will fail. Deleting and regenerating provisioning.. effect. iphone ios xcode code signing xcrun share improve this question CODE_SIGN_IDENTITY verification script. Often in set ups that use version control the project.pbxproj can be merged in such a way that two CODE_SIGN_IDENTITY lines can..
How to decrease build times / speed up compile time in XCode? http://stackoverflow.com/questions/1479085/how-to-decrease-build-times-speed-up-compile-time-in-xcode decrease that as well would be appreciated iphone xcode build compilation performance share improve this question Often the largest thing you can do is to control your inclusion of header files. Including extra header files in source code dramatically..
NSOperation and NSOperationQueue callback http://stackoverflow.com/questions/1978621/nsoperation-and-nsoperationqueue-callback you've created. The work When you create your operation but before you queue it tell it who should receive the result. Often this is the object that creates the operation myOperation setDelegate self At the end of your operation's main function..
http://stackoverflow.com/questions/3779306/uitextview-delegates-problem only code that executes during such load are awakeFromNib methods it's up to you to find a problem along those lines. Often top of code's execution doesn't make any sense for example you might see your ViewController method somewhere but the top..
Why Isn't Core Data Fetching My Data? http://stackoverflow.com/questions/5467193/why-isnt-core-data-fetching-my-data actual problem was. If the persistent store is not accessible there is typically something wrong with the file path. Often a file URL is pointing into the application's resources directory instead of a writeable directory. If you encounter schema..
UIView addsubview after orientation change: Tell view to resize http://stackoverflow.com/questions/5995617/uiview-addsubview-after-orientation-change-tell-view-to-resize self.view.bounds inputView show Thanks iphone orientation addsubview autoresizingmask share improve this question Often a NIB XIB file contains a UIViewController that takes care of all of this. In this case since their is no view controller..
Detect if the user has touched the screen http://stackoverflow.com/questions/9251174/detect-if-the-user-has-touched-the-screen actual problem was. If the persistent store is not accessible there is typically something wrong with the file path. Often a file URL is pointing into the application's resources directory instead of a writeable directory. If you encounter schema..
Should views be created using NIBs or code in iPhone? http://stackoverflow.com/questions/998452/should-views-be-created-using-nibs-or-code-in-iphone when designing views using Interface Builder iphone uiview uiviewcontroller share improve this question Often you want to use Interface Builder there are several reasons why you would want to do this over programmatic interfaces it..
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