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2014/10/15 ¤U¤È 10:15:09
iphone Programming Glossary: typicallyAutorotate in iOS 6 has strange behaviour http://stackoverflow.com/questions/12526054/autorotate-in-ios-6-has-strange-behaviour orientations can change over time. The system asks the top most full screen view controller typically the root view controller for its supported interface orientations whenever the device rotates or whenever..
iOS 6: How do I restrict some views to portrait and allow others to rotate? http://stackoverflow.com/questions/12630359/ios-6-how-do-i-restrict-some-views-to-portrait-and-allow-others-to-rotate whether they should autorotate. ... The system asks the top most full screen view controller typically the root view controller for its supported interface orientations whenever the device rotates or whenever..
Where to place the “Core Data Stack” in a Cocoa/Cocoa Touch application http://stackoverflow.com/questions/1267520/where-to-place-the-core-data-stack-in-a-cocoa-cocoa-touch-application it's own class whose responsibility is to handle the management of the Core Data Stack. Do you typically encapsulate this functionality within its own class or do you leave it in the App Delegate iphone cocoa.. Using and passing a singleton object that manages a stack and from which you retrieve a context typically at best introduces a needless level of indirection and at worst introduces unnecessary application rigidity...
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library object file in the library that defines an Objective C class or category. While this option will typically result in a larger executable due to additional object code loaded into the application it will allow..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received error so I will leave this open as a catch all for the dreaded Bad Access error. EXC_BAD_ACCESS is typically thrown as the result of an illegal memory access. You can find more information in the answers below...
How do I size a UITextView to its content? http://stackoverflow.com/questions/50467/how-do-i-size-a-uitextview-to-its-content sizeThatShouldFitTheContent.height heightConstraint is a layout constraint that you typically setup via a IBOutlet by linking the property to the height constraint created in a storyboard. share..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space in Pixel Space I'm working on an iPhone app that uses OpenGL ES 2 for its drawing. I know that typically texture coordinates are defined in the 0 1 range but ideally I'd like to map them from 0 1023 the size..
http://stackoverflow.com/questions/6124109/instance-variables-with-underscore-in-objective-c-2-0-and-renaming-with-synthet their values and never use it what are they for The static analyzer is thus warning you because typically variables that are never accessed are just remains of older code that has changed and you can remove..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c @selector windowDidMove self delegate windowDidMove 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..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically of myRootController I do this Implement viewDidLoad to do additional setup after loading the view typically from a nib. void viewDidLoad super viewDidLoad ViewControllerA vcA ViewControllerA alloc initWithNib.. the view from ViewControllerA when I start the app. But now the big question is A View Controller typically has all those methods like void viewWillAppear BOOL animated void viewDidDisappear BOOL animated void..
Autorotate in iOS 6 has strange behaviour http://stackoverflow.com/questions/12526054/autorotate-in-ios-6-has-strange-behaviour can change over time ”even an app ™s supported interface orientations can change over time. The system asks the top most full screen view controller typically the root view controller for its supported interface orientations whenever the device rotates or whenever a view controller is presented with the full screen modal..
iOS 6: How do I restrict some views to portrait and allow others to rotate? http://stackoverflow.com/questions/12630359/ios-6-how-do-i-restrict-some-views-to-portrait-and-allow-others-to-rotate UINavigationController do not consult their children to determine whether they should autorotate. ... The system asks the top most full screen view controller typically the root view controller for its supported interface orientations whenever the device rotates or whenever a view controller is presented with the full screen modal..
Where to place the “Core Data Stack” in a Cocoa/Cocoa Touch application http://stackoverflow.com/questions/1267520/where-to-place-the-core-data-stack-in-a-cocoa-cocoa-touch-application My initial inclination however is to move this code into it's own class whose responsibility is to handle the management of the Core Data Stack. Do you typically encapsulate this functionality within its own class or do you leave it in the App Delegate iphone cocoa cocoa touch core data share improve this question Summary.. usually a managed object context otherwise a managed object. Using and passing a singleton object that manages a stack and from which you retrieve a context typically at best introduces a needless level of indirection and at worst introduces unnecessary application rigidity. No example retrieves the context using UIApplication..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library to the linker. This flag causes the linker to load every object file in the library that defines an Objective C class or category. While this option will typically result in a larger executable due to additional object code loaded into the application it will allow the successful creation of effective Objective C static libraries..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received to this question deal with the general EXC_BAD_ACCESS error so I will leave this open as a catch all for the dreaded Bad Access error. EXC_BAD_ACCESS is typically thrown as the result of an illegal memory access. You can find more information in the answers below. Have you encountered the EXC_BAD_ACCESS signal before and..
How do I size a UITextView to its content? http://stackoverflow.com/questions/50467/how-do-i-size-a-uitextview-to-its-content
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space Texture Coordinates in Pixel Space I'm working on an iPhone app that uses OpenGL ES 2 for its drawing. I know that typically texture coordinates are defined in the 0 1 range but ideally I'd like to map them from 0 1023 the size of my TextureAtlas for readability's sake. I've seen sample..
http://stackoverflow.com/questions/6124109/instance-variables-with-underscore-in-objective-c-2-0-and-renaming-with-synthet kind of warning you get for local variables if you only define their values and never use it what are they for The static analyzer is thus warning you because typically variables that are never accessed are just remains of older code that has changed and you can remove them. But in your case it could be perfectly fine. share improve..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c send it if appropriate. if self delegate respondsToSelector @selector windowDidMove self delegate windowDidMove 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..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically Just to see which one is active. So in the implementation of myRootController I do this Implement viewDidLoad to do additional setup after loading the view typically from a nib. void viewDidLoad super viewDidLoad ViewControllerA vcA ViewControllerA alloc initWithNib self.contentView addSubview vcA.view cvA release By the way.. initialization here if needed return self That works. I see the view from ViewControllerA when I start the app. But now the big question is A View Controller typically has all those methods like void viewWillAppear BOOL animated void viewDidDisappear BOOL animated void viewDidLoad ...and so on. Who or what or how would those methods..
Iphone - How to encrypt NSData with public key and decrypt with private key? http://stackoverflow.com/questions/10072124/iphone-how-to-encrypt-nsdata-with-public-key-and-decrypt-with-private-key #pragma mark View lifecycle void viewDidLoad super viewDidLoad Do any additional setup after loading the view typically from a nib. void viewDidUnload super viewDidUnload Release any retained subviews of the main view. e.g. self.myOutlet nil..
Autorotate in iOS 6 has strange behaviour http://stackoverflow.com/questions/12526054/autorotate-in-ios-6-has-strange-behaviour app ™s supported interface orientations can change over time. The system asks the top most full screen view controller typically the root view controller for its supported interface orientations whenever the device rotates or whenever a view controller..
iOS 6: How do I restrict some views to portrait and allow others to rotate? http://stackoverflow.com/questions/12630359/ios-6-how-do-i-restrict-some-views-to-portrait-and-allow-others-to-rotate children to determine whether they should autorotate. ... The system asks the top most full screen view controller typically the root view controller for its supported interface orientations whenever the device rotates or whenever a view controller..
Where to place the “Core Data Stack” in a Cocoa/Cocoa Touch application http://stackoverflow.com/questions/1267520/where-to-place-the-core-data-stack-in-a-cocoa-cocoa-touch-application to move this code into it's own class whose responsibility is to handle the management of the Core Data Stack. Do you typically encapsulate this functionality within its own class or do you leave it in the App Delegate iphone cocoa cocoa touch core.. a managed object. Using and passing a singleton object that manages a stack and from which you retrieve a context typically at best introduces a needless level of indirection and at worst introduces unnecessary application rigidity. No example..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library linker to load every object file in the library that defines an Objective C class or category. While this option will typically result in a larger executable due to additional object code loaded into the application it will allow the successful creation..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received EXC_BAD_ACCESS error so I will leave this open as a catch all for the dreaded Bad Access error. EXC_BAD_ACCESS is typically thrown as the result of an illegal memory access. You can find more information in the answers below. Have you encountered..
Adding a UILabel to a UIToolbar http://stackoverflow.com/questions/333441/adding-a-uilabel-to-a-uitoolbar button but they can be instantiated with any view you require. Here is some example code. Note since other buttons are typically on the toolbar spacers are placed on each side of the title button so it stays centered. NSMutableArray items self.toolbar..
iPhone proper usage of Application Delegate http://stackoverflow.com/questions/338734/iphone-proper-usage-of-application-delegate variable as a User object in the app delegate and referencing it from there when needed a poor way of going about it I typically set it there upon the user's login. Wanted to hear how the pros handle this one. iphone objective c cocoa touch share..
How do I size a UITextView to its content? http://stackoverflow.com/questions/50467/how-do-i-size-a-uitextview-to-its-content heightConstraint.constant sizeThatShouldFitTheContent.height heightConstraint is a layout constraint that you typically setup via a IBOutlet by linking the property to the height constraint created in a storyboard. share improve this answer..
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 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 it's really unclear to me when each gets executed and what is the more..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space Texture Coordinates in Pixel Space I'm working on an iPhone app that uses OpenGL ES 2 for its drawing. I know that typically texture coordinates are defined in the 0 1 range but ideally I'd like to map them from 0 1023 the size of my TextureAtlas..
http://stackoverflow.com/questions/6124109/instance-variables-with-underscore-in-objective-c-2-0-and-renaming-with-synthet if you only define their values and never use it what are they for The static analyzer is thus warning you because typically variables that are never accessed are just remains of older code that has changed and you can remove them. But in your case..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c respondsToSelector @selector windowDidMove self delegate windowDidMove 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..
UIButton can't be touched while animated with UIView animateWithDuration http://stackoverflow.com/questions/8346100/uibutton-cant-be-touched-while-animated-with-uiview-animatewithduration on the button's .layer.presentationLayer property need to import the QuartzCore framework to do this . This would typically be done in touch handling methods in your view controller. I am happy to expand on this answer if you need more. Here is.. is managing your buttons. When I did this I was interested in the initial touch rather than the touch ending which is typically when a tap would register but the principle is the same. Remember to import the QuartzCore framework and add it to your..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically the implementation of myRootController I do this Implement viewDidLoad to do additional setup after loading the view typically from a nib. void viewDidLoad super viewDidLoad ViewControllerA vcA ViewControllerA alloc initWithNib self.contentView addSubview.. That works. I see the view from ViewControllerA when I start the app. But now the big question is A View Controller typically has all those methods like void viewWillAppear BOOL animated void viewDidDisappear BOOL animated void viewDidLoad ...and..
Correcting floating point numbers http://stackoverflow.com/questions/10049533/correcting-floating-point-numbers many bits to use so they quickly run out and have to round to the nearest value that they are capable of representing. Typically you don't worry about the .0000001 and just format them when you want to display them to the user with the appropriate number..
http://stackoverflow.com/questions/14561579/ios-device-bluetooth improve this question iPhone iPad is Bluetooth 4.0 The data rate depends on the version of the devices involved. Typically Classic Bluetooth data rate is 2.0 or 3.0 Mbps theoretical over the air bit rate. Will will translate to around 1.5 2.0..
Core Data “Upsert” from SQLite Database http://stackoverflow.com/questions/1997212/core-data-upsert-from-sqlite-database sqlite core data embedded database upsert share improve this question Where is the original database coming from Typically you would convert all your data to Core Data during development and then ship the app with a pre populated Core Data store..
Question about factory method object lifetimes in Objective-C/Cocoa (to retain or not…) http://stackoverflow.com/questions/2017793/question-about-factory-method-object-lifetimes-in-objective-c-cocoa-to-retain-o main No. You can only count on the object being around until you return from whichever method or function you're in. Typically autorelease pools are flushed when control returns back to your run loop. If you want an object instance to survive beyond..
What exactly must I do in viewDidUnload? http://stackoverflow.com/questions/2261972/what-exactly-must-i-do-in-viewdidunload file objects created in your viewDidLoad method and objects created lazily at runtime and added to the view hierarchy. Typically if your view controller contains outlets properties or raw variables that contain the IBOutlet keyword you should use the..
Receive HTTP Headers via NSURLRequest/NSURLConnection in Cocoa http://stackoverflow.com/questions/237164/receive-http-headers-via-nsurlrequest-nsurlconnection-in-cocoa in Cocoa I've been working on figuring out how to receive HTTP Headers via a request made with NSURLConnection. Typically a request is made with something as simple as the following NSURLConnection connection NSURLConnection alloc initWithRequest..
http://stackoverflow.com/questions/2978977/what-is-delegate-in-iphone and or can affect how another object behaves. The objects work together for the greater good of completing a task. Typically a delegate object will be shared by many other objects that have a more specific task to carry out. The delegate itself..
unrecognized selector sent to instance http://stackoverflow.com/questions/3645213/unrecognized-selector-sent-to-instance happening is an objc object is requested to perform a message which it does not respond to i.e. is not implemented . Typically this happens as a programmer's mistake at least for me such as an argument passed as another type which slips through a..
iphone how to get crash log from customers? http://stackoverflow.com/questions/3844482/iphone-how-to-get-crash-log-from-customers c crash crash reports share improve this question You can perform your own crash logging with PLCrashReporter . Typically you write the crash log to a file and then send it to a server the next time the app starts. In order to prevent an infinite..
Passing argument within action selection in UIButton http://stackoverflow.com/questions/3992812/passing-argument-within-action-selection-in-uibutton possible as the colon after the selector name indicates so. iphone objective c xcode share improve this question Typically aSelector will be defined like this void aSelector id sender NSLog @ sender @ sender and the argument will be myButton...
What is meant by .delegate=self? http://stackoverflow.com/questions/4211947/what-is-meant-by-delegate-self somewhereELse will send the messages to somewhereELse . blah.delegate self will send the messages to you. Typically you want the messages to come to you so you just say blah.delegate self It is a very common mistake to forget that line..
Game Center - Sending and receiving data http://stackoverflow.com/questions/4574119/game-center-sending-and-receiving-data match sendDataToAllPlayers packet withDataMode GKMatchSendDataUnreliable error error if error nil handle the error Typically you'll want a struct so that there's some additional information that lets the receivers know what kind of data it is. In..
Best architecture for an iOS application that makes many network requests? http://stackoverflow.com/questions/4810289/best-architecture-for-an-ios-application-that-makes-many-network-requests maintain and extend I have a single object taking care of network connectivity let's call it a network manager . Typically this object is a singleton created using Matt Gallagher's Cocoa singleton macro . Since you use ASIHTTPRequest which I always..
Is there a good tutorial on cocoa touch automated UI testing? http://stackoverflow.com/questions/5393190/is-there-a-good-tutorial-on-cocoa-touch-automated-ui-testing there a good tutorial on cocoa touch automated UI testing Typically I find that nearly all my most important test cases for iPhone development revolve around UI testing rather than business..
iPhone Dev - How important is Project.pbxproj? http://stackoverflow.com/questions/5931788/iphone-dev-how-important-is-project-pbxproj configuration targeted platforms etc... I.e. it is a critically important. There really isn't a great answer for this. Typically teams will avoid conflict by limiting edits to the project to one team member at a time. The Xcode team has put a lot of..
Where we have to store download data in iPhone application? http://stackoverflow.com/questions/7963484/where-we-have-to-store-download-data-in-iphone-application that anything that is not intended to be seen by the user should go into a directory inside the Library directory. Typically you would use one of these but there is a larger list with more specialized uses in the File System Programming Guide Application..
NSDateFormatter dateFromString gives the wrong date http://stackoverflow.com/questions/8186833/nsdateformatter-datefromstring-gives-the-wrong-date used in the ISO year week calendar. In most cases yyyy and YYYY yield the same number however they may be different. Typically you should use the calendar year. And to be correct you also have to change EE to EEE . Though they yield the same result..
Detect if the user has touched the screen http://stackoverflow.com/questions/9251174/detect-if-the-user-has-touched-the-screen release managedObjectModel release persistentStoreCoordinator release super dealloc void awakeFromNib Typically you should set up the Core Data stack here usually by passing the managed object context to the first view controller. self..managedObjectContext..
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