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2014/10/15 ¤U¤È 10:11:00
iphone Programming Glossary: let'sHow to detect iPhone 5 (widescreen devices)? http://stackoverflow.com/questions/12446990/how-to-detect-iphone-5-widescreen-devices versions of the iPod touch will maybe also have such a screen so we may use another set of macros. Let's rename the original macro IS_WIDESCREEN #define IS_WIDESCREEN fabs double UIScreen mainScreen bounds..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework value. To give some perspective like as in why would we be using this function in the first place Let's say we want to perform pitch detection on microphone input and we have set it up so that some callback..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers below in case it's helpful. Example of Using Dependency Injection with a View Controller Let's say you're building a screen in which several books are listed. The user can pick books he she wants.. class that controlls and displays the GUI view objects. Where will it get all the book data Let's say it depends on a BookWarehouse object for that. So now your controller is basically brokering data..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space has been asked a few times but I don't have the links at hand so a quick and rough explanation. Let's say the texture is 8 pixels wide 0 1 2 3 4 5 6 7 ^ ^ ^ ^ ^ ^ ^ ^ ^ 0.0 1.0 0 8 1 8 2 8 3 8 4 8 5..
How do I set up a simple delegate to communicate between two view controllers? http://stackoverflow.com/questions/6168919/how-do-i-set-up-a-simple-delegate-to-communicate-between-two-view-controllers follow example. Thank You iphone ios delegates share improve this question Simple example... Let's say the child view controller has a UISlider and we want to pass the value of the slider back to the..
Store orientation to an array - and compare http://stackoverflow.com/questions/6368618/store-orientation-to-an-array-and-compare newly measured Obviously the second array is similar to the newly measured and the first is not. Let's compute the cost matrices according to this paper subsection 2.1 D i j Dist i j MIN D i 1 j D i j 1..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c you read which helped you get it iphone objective c cocoa memory share improve this question Let's start with retain and release autorelease is really just a special case once you understand the basic..
http://stackoverflow.com/questions/72288/learning-opengl-es-1-x OpenGL ES 1.x What is the quickest way to come up to speed on OpenGL ES 1.x Let's assume I know nothing about OpenGL which is not entirely true but it's been a while since I last used..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview way is to do your request programmatically first then load the UIWebView from what you requested. Let's say you take the second example above where you have NSString page as the result of a call to stringWithContentsOfURL..
How to detect iPhone 5 (widescreen devices)? http://stackoverflow.com/questions/12446990/how-to-detect-iphone-5-widescreen-devices does only detect a widescreen not an actual iPhone 5. Next versions of the iPod touch will maybe also have such a screen so we may use another set of macros. Let's rename the original macro IS_WIDESCREEN #define IS_WIDESCREEN fabs double UIScreen mainScreen bounds .size.height double 568 DBL_EPSILON And let's add model detection..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework can squash the return value into the same space as the send value. To give some perspective like as in why would we be using this function in the first place Let's say we want to perform pitch detection on microphone input and we have set it up so that some callback gets triggered every time the microphone gets in 1024 floats...
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers example of using the dependency injection pattern with a controller below in case it's helpful. Example of Using Dependency Injection with a View Controller Let's say you're building a screen in which several books are listed. The user can pick books he she wants to buy and then tap a checkout button to go to the checkout.. screen. To build this you might create a BookPickerViewController class that controlls and displays the GUI view objects. Where will it get all the book data Let's say it depends on a BookWarehouse object for that. So now your controller is basically brokering data between a model object BookWarehouse and the GUI view objects...
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space c cocoa touch opengl es share improve this question This has been asked a few times but I don't have the links at hand so a quick and rough explanation. Let's say the texture is 8 pixels wide 0 1 2 3 4 5 6 7 ^ ^ ^ ^ ^ ^ ^ ^ ^ 0.0 1.0 0 8 1 8 2 8 3 8 4 8 5 8 6 8 7 8 8 8 The digits denote the texture's pixels the bars..
How do I set up a simple delegate to communicate between two view controllers? http://stackoverflow.com/questions/6168919/how-do-i-set-up-a-simple-delegate-to-communicate-between-two-view-controllers I know what delegates are and just wanted to see a simple to follow example. Thank You iphone ios delegates share improve this question Simple example... Let's say the child view controller has a UISlider and we want to pass the value of the slider back to the parent via a delegate. In the child view controller's header..
Store orientation to an array - and compare http://stackoverflow.com/questions/6368618/store-orientation-to-an-array-and-compare We measured 2 4 6 7 . Which array is the most similar to the newly measured Obviously the second array is similar to the newly measured and the first is not. Let's compute the cost matrices according to this paper subsection 2.1 D i j Dist i j MIN D i 1 j D i j 1 D i 1 j 1 Here D i j is the i j element of the cost matrix see..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c are the conventions about their use Or failing that what did you read which helped you get it iphone objective c cocoa memory share improve this question Let's start with retain and release autorelease is really just a special case once you understand the basic concepts. In Cocoa each object keeps track of how many times..
http://stackoverflow.com/questions/72288/learning-opengl-es-1-x OpenGL ES 1.x What is the quickest way to come up to speed on OpenGL ES 1.x Let's assume I know nothing about OpenGL which is not entirely true but it's been a while since I last used OpenGL . I am most interested in learning this for iPhone..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview then give it to you as an NSString of HTML. Another way is to do your request programmatically first then load the UIWebView from what you requested. Let's say you take the second example above where you have NSString page as the result of a call to stringWithContentsOfURL encoding error . You can then push that string..
Checkbox image toggle in UITableViewCell http://stackoverflow.com/questions/1171476/checkbox-image-toggle-in-uitableviewcell pretty easy. Just create a new subclass of UIControl and put it all in there no need for a separate controller. Let's call it ToggleImageControl. @interface ToggleImageControl UIControl BOOL selected UIImageView imageView UIImage normalImage..
How to detect iPhone 5 (widescreen devices)? http://stackoverflow.com/questions/12446990/how-to-detect-iphone-5-widescreen-devices iPhone 5. Next versions of the iPod touch will maybe also have such a screen so we may use another set of macros. Let's rename the original macro IS_WIDESCREEN #define IS_WIDESCREEN fabs double UIScreen mainScreen bounds .size.height double..
Objective-C 101 (retain vs assign) NSString http://stackoverflow.com/questions/1380338/objective-c-101-retain-vs-assign-nsstring C 101 retain vs assign NSString A 101 question Let's say i'm making database of cars and each car object is defined as #import UIKit UIKit.h @interface Car NSObject NSString..
MFMailComposeViewController image orientation http://stackoverflow.com/questions/20204495/mfmailcomposeviewcontroller-image-orientation state. Nothing amazing to see here. We get exactly the same values as we did back in the imagePickerController code. Let's see exactly how the problem manifests To begin the camera takes a portrait shot and it is displayed correctly in portrait..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework space as the send value. To give some perspective like as in why would we be using this function in the first place Let's say we want to perform pitch detection on microphone input and we have set it up so that some callback gets triggered every..
Subclassing NSOperation to be concurrent and cancellable http://stackoverflow.com/questions/3859631/subclassing-nsoperation-to-be-concurrent-and-cancellable flag is not modified when you call cancelAllOperations on the NSOperationQueue that contains this operation Let's deal with these in order. I'm going to assume that your subclass of NSOperation is called MyOperation just for ease of explanation...
Most effective way to do networking on Mac/iPhone? http://stackoverflow.com/questions/4269613/most-effective-way-to-do-networking-on-mac-iphone the way to go feel free to punch in some thoughts too I'm really just interested in finding the right way to do it. Let's presume the protocol to be a custom one so our needs cannot be serviced by the Cocoa based HTTP client classes My current..
Can you use cancel/isCancelled with GCD/dispatch_async? http://stackoverflow.com/questions/5449469/can-you-use-cancel-iscancelled-with-gcd-dispatch-async with a thread you have launched with GCD Currently I just use a boolean as a flag to cancel the background process. Let's say you want to do a lot of processing in the background while keeping the UI responsive so that you can catch a cancel..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers pattern with a controller below in case it's helpful. Example of Using Dependency Injection with a View Controller Let's say you're building a screen in which several books are listed. The user can pick books he she wants to buy and then tap.. a BookPickerViewController class that controlls and displays the GUI view objects. Where will it get all the book data Let's say it depends on a BookWarehouse object for that. So now your controller is basically brokering data between a model object..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space this question This has been asked a few times but I don't have the links at hand so a quick and rough explanation. Let's say the texture is 8 pixels wide 0 1 2 3 4 5 6 7 ^ ^ ^ ^ ^ ^ ^ ^ ^ 0.0 1.0 0 8 1 8 2 8 3 8 4 8 5 8 6 8 7 8 8 8 The digits..
How to compare two NSDates: Which is more recent? http://stackoverflow.com/questions/5965044/how-to-compare-two-nsdates-which-is-more-recent NotePage 6903 207 ...iP is more up to date. iphone objective c cocoa touch nsdate share improve this question Let's assume two dates NSDate date1 NSDate date2 Then the following comparison will tell which is earlier later same if date1..
How do I set up a simple delegate to communicate between two view controllers? http://stackoverflow.com/questions/6168919/how-do-i-set-up-a-simple-delegate-to-communicate-between-two-view-controllers to see a simple to follow example. Thank You iphone ios delegates share improve this question Simple example... Let's say the child view controller has a UISlider and we want to pass the value of the slider back to the parent via a delegate...
Store orientation to an array - and compare http://stackoverflow.com/questions/6368618/store-orientation-to-an-array-and-compare most similar to the newly measured Obviously the second array is similar to the newly measured and the first is not. Let's compute the cost matrices according to this paper subsection 2.1 D i j Dist i j MIN D i 1 j D i j 1 D i 1 j 1 Here D i j..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c that what did you read which helped you get it iphone objective c cocoa memory share improve this question Let's start with retain and release autorelease is really just a special case once you understand the basic concepts. In Cocoa..
http://stackoverflow.com/questions/72288/learning-opengl-es-1-x OpenGL ES 1.x What is the quickest way to come up to speed on OpenGL ES 1.x Let's assume I know nothing about OpenGL which is not entirely true but it's been a while since I last used OpenGL . I am most..
steps for creating UIScrollView with Interface Builder http://stackoverflow.com/questions/9118796/steps-for-creating-uiscrollview-with-interface-builder midst of trying to use a UIScrollView and there appears to be some fundamental thing that I'm just not understanding. Let's say I want to use a UIScrollView in my iphone app. I have a View filled with buttons that is 320x700. Obviously this is..
MKMapView annotations changing/losing order? http://stackoverflow.com/questions/9539802/mkmapview-annotations-changing-losing-order detail button is clicked it segues into a new view. My MKAnnotations are a custom class that implements MKAnnotation . Let's call that class MyClass. They are stored in an NSMutableArray. During viewdidload of this view I add each object of MyClass..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview of HTML. Another way is to do your request programmatically first then load the UIWebView from what you requested. Let's say you take the second example above where you have NSString page as the result of a call to stringWithContentsOfURL encoding..
UISearchbar clearButton forces the keyboard to appear http://stackoverflow.com/questions/1092246/uisearchbar-clearbutton-forces-the-keyboard-to-appear else. To keep track of that we need to declare a BOOL ivar in our viewController that is also the searchBar delegate let's call it shouldBeginEditing and set it with an initial value of YES supposing our viewController class is called SearchViewController..
How would I tint an image programatically on the iPhone? http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone First you'll want to subclass UIImageView and override the drawRect method. Your class needs a UIColor property let's call it overlayColor to hold the blend color and a custom setter that forces a redraw when the color changes. Something..
How to detect iPhone 5 (widescreen devices)? http://stackoverflow.com/questions/12446990/how-to-detect-iphone-5-widescreen-devices IS_WIDESCREEN #define IS_WIDESCREEN fabs double UIScreen mainScreen bounds .size.height double 568 DBL_EPSILON And let's add model detection macros #define IS_IPHONE UIDevice currentDevice model isEqualToString @ iPhone #define IS_IPOD UIDevice..
What happens if I don't retain IBOutlet? http://stackoverflow.com/questions/1250518/what-happens-if-i-dont-retain-iboutlet as to whom owns this new text field because the memory management semantics are not contained within the setter. Now let's say a different view controller is pushed on the UINavigation Controller's stack so that this view is no longer in the foreground...
Core Data: Quickest way to delete all instances of an entity http://stackoverflow.com/questions/1383598/core-data-quickest-way-to-delete-all-instances-of-an-entity using Core Data to locally persist results from a Web Services call. The web service returns the full object model for let's say Cars could be about 2000 of them and I can't make the Web Service return anything less than 1 or ALL cars. The next..
Popover with embedded navigation controller doesn't respect size on back nav http://stackoverflow.com/questions/2752394/popover-with-embedded-navigation-controller-doesnt-respect-size-on-back-nav size of the popover does not restore Changing size of the popover in viewWillAppear gives very strange animation when let's say you popController inside the popover I'd not recommend it For me setting the hardcoded size inside the controller would..
Split NSData objects into other NSData objects with a given size http://stackoverflow.com/questions/2899020/split-nsdata-objects-into-other-nsdata-objects-with-a-given-size NSData object of approximately 1000kb big. Now I want to transfer this via bluetooth. This would be better if I have let's say 10 objects of 100kb. It comes to mind that I should use the subdataWithRange method of NSData. I haven't really worked..
How to accommodate for the iPhone 4 screen resolution? http://stackoverflow.com/questions/2992360/how-to-accommodate-for-the-iphone-4-screen-resolution Just enough to tap it. Things have been positioned relative to the upper left to reach a specific position on screen let's say the center or somewhere at the bottom. Edit It seems Apple has integrated an switch that allows to tell if an app is..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework app loads and call the complimentary release function once when it quits. DON'T do it lots of times it is expensive. let's say log2n 8 so n 2^8 256 samples or 'harmonics' or 'terms' if we pre calculate the 256th roots of unity of which there are..
Bonjour over bluetooth WITHOUT Gamekit ? http://stackoverflow.com/questions/3844189/bonjour-over-bluetooth-without-gamekit initWithDomain @ type @ _http._tcp name @ port 8080 autorelease self.netService publish With iOS5 however let's call it Bluetooth Bonjour is disabled by default so you have to use the C API declared in dns_sd.h . DNSServiceRef serviceRef..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file Hello World CGContextShowTextAtPoint pdfContext 260 390 text strlen text End text We are done drawing to this page let's end it We could add as many pages as we wanted using CGContextBeginPage CGContextEndPage CGContextEndPage pdfContext We..
Getting displacement from accelerometer data with Core Motion http://stackoverflow.com/questions/4449565/getting-displacement-from-accelerometer-data-with-core-motion after doing integration twice. Situation will become even worse after one second if you configure accelerometer with let's say 50 Hz i.e. 50 ticks are processed and the tiny neglectable error will outrun the true value. I would strongly recommend..
NSMutableString as retain/copy http://stackoverflow.com/questions/4995254/nsmutablestring-as-retain-copy not very considerate for clients. it also implies a lot of unnecessary things and introduces additional copy overhead. let's re evaluate this. additional considerations problems at this point the default setter requires that the client makes a mutableCopy..
Convert decimal to fraction in Objective-C? http://stackoverflow.com/questions/5552537/convert-decimal-to-fraction-in-objective-c aFraction.denominator aFraction.error Prints this Real 123.450 fraction 3827 31 error 0.002 Last but not least let's see how we get our newly crafted fraction into out text field double myVariable 7.5 long maxDenominator 1000 sample value..
iPhone/iPad App Code Obfuscation - Is it Possible? Worth it? http://stackoverflow.com/questions/5556849/iphone-ipad-app-code-obfuscation-is-it-possible-worth-it ipad obfuscation store share improve this question There doesn't seem to a code obfuscator for Objective C. But let's assume for a moment that one does exist. Apple will probably not reject an obfuscated app as long as it doesn't crash. The..
How to check what day of the week it is (i.e. Tues, Fri?) and compare two NSDates? http://stackoverflow.com/questions/583692/how-to-check-what-day-of-the-week-it-is-i-e-tues-fri-and-compare-two-nsdate what day of the week it is given a date. I'd like to if 1 1 09 is a Tuesday Monday etc... Is there any library that let's you calculate this This obviously needs to take into account leap years and a tons of other stuff... Maybe there's an objective..
What exactly does delegate do in xcode ios project? http://stackoverflow.com/questions/7215698/what-exactly-does-delegate-do-in-xcode-ios-project create your own protocol datasource delegates etc... so your control can focus on doing what's advertised. For example let's say you wanted to create a task control. You could First create a contract. Hey if you're going to provide data for my control..
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating c ios multithreading osx share improve this question GCD and performSelectorInBackground samples below. But first let's look at your code. You cannot wait where you want to in the code above. Here's the code you had. Where you say wait in the..
UIModalTransitionStylePartialCurl doesn't get back to previous state. (Not dismissing) http://stackoverflow.com/questions/8606674/uimodaltransitionstylepartialcurl-doesnt-get-back-to-previous-state-not-dismi doesn't get back to previous state. Not dismissing I've got 2 view controllers let's say A and B. In A I'm calling B to be shown with transition style UIModalTransitionStylePartialCurl b setModalTransitionStyle..
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