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2014/10/15 ¤U¤È 10:04:56
iphone Programming Glossary: causeUIScrollView. Any thoughts on implementing “infinite” scroll/zoom? http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom is fixed at creation time. 2 zooming can blow any lazy loading scheme all to hell since it can cause infinte data explosion. Have others out there pondered this idea Yah I know we are essentially talking..
Programmatically turn on bluetooth in the iphone sdk? http://stackoverflow.com/questions/1743610/programmatically-turn-on-bluetooth-in-the-iphone-sdk
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library blogs and apple docs. Now I try make short summary of my searches and experiments. Problem was caused by citation from apple Technical Q A QA1490 http developer.apple.com mac library qa qa2006 qa1490.html.. To resolve this issue the static library should pass the ObjC option to the linker. This flag causes the linker to load every object file in the library that defines an Objective C class or category... archive. we can use force_load to reduce app binary size and to avoid conflicts wich all_load can cause in some cases. Yes it works with .a files added to the project. Yet I had troubles with lib project..
How does Apple know you are using private API? http://stackoverflow.com/questions/2842357/how-does-apple-know-you-are-using-private-api Objective C classes such as UIProgressHUD Ivars such as UITouch._phase which could be the cause of rejection of Three20 based apps last few months. 3. Listing Objective C selectors or strings Objective..
iphone webkit css animations cause flicker http://stackoverflow.com/questions/2946748/iphone-webkit-css-animations-cause-flicker webkit css animations cause flicker This is the iphone site http www.thevisionairegroup.com projects accessorizer site After you..
http://stackoverflow.com/questions/3245733/apple-gyroscope-sample-code or just call it from the init method. The following will store the initial device attitude and cause the device to continue sampling the gyro and updating its attitude property. void enableGyro CMDeviceMotion..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll TableView. I want to make sure I'm on the right path before I change too much code. I'm confused because so many of the examples are array based instead of CoreData. Here are some questions Do I need to have.. searchString scope self.searchDisplayController.searchBar selectedScopeButtonIndex Return YES to cause the search result table view to be reloaded. return YES BOOL searchDisplayController UISearchDisplayController.. text scope self.searchDisplayController.searchBar selectedScopeButtonIndex Return YES to cause the search result table view to be reloaded. return YES make sure that you use the correct table view..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events app be looking like running forever . Register for one background process i.e. VoIP . This will cause your app to be restarted after termination. Now write some Task has to be finished code. According to.. your work. In the code below you can see that i have a comment at the expirationHandler. This will cause your app running as long as the system allows your app to be running. All timers and threads stay running.. your app runs longer But one thing is for sure your app will be terminated after a while. But because you registered your app as VoIP or one of the others the system restarts the app in background which..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now Even though a number of the methods work they don't actually work because there is a bizarre progressive slow down artifact you will see clearly in the demo. Scroll to the 'answer'.. anyone reading in the future if you are actually unable to get this to work in production code because of the mystery progressive slowdown ... Felz and Void have each presented astounding solutions in the.. from being started. Additionally anything that runs for a while on the main thread will also cause your touch handling to be unresponsive. This means that there is no way to force a UI refresh to occur..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector.. may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause.. its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because its selector is unknown . Here's what I'm doing _controller performSelector NSSelectorFromString..
When is layoutSubviews called? http://stackoverflow.com/questions/728372/when-is-layoutsubviews-called or any I could find on the net so I tried it in practice and here is what I got init does not cause layoutSubviews to be called duh addSubview causes layoutSubviews to be called on the view being added.. in practice and here is what I got init does not cause layoutSubviews to be called duh addSubview causes layoutSubviews to be called on the view being added the view it ™s being added to target view and all.. it ™s frame set only if the size parameter of the frame is different scrolling a UIScrollView causes layoutSubviews to be called on the scrollView and it ™s superview rotating a device only calls layoutSubview..
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample your app ™s main thread doing so could block your main thread for an extended period of time or cause a deadlock with one of your app ™s own file presenters. When you move a file or directory to iCloud the..
Transparent Modal View on Navigation Controller http://stackoverflow.com/questions/849458/transparent-modal-view-on-navigation-controller I tried playing around with the origin of the frame used to init the modalView but negative values cause it to not display. The best method that I found to cover the entire screen besides the status bar is..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons id can take a little more thinking about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this.. naming to make decisions about memory management. If it's all ARC code then it doesn't matter because it will do it the same wrong on both sides. But if it's mixed ARC non ARC then there's a mismatch. ARC..
UIScrollView. Any thoughts on implementing “infinite” scroll/zoom? http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom there are two fundamental impediments 1 scrollView.contentSize is fixed at creation time. 2 zooming can blow any lazy loading scheme all to hell since it can cause infinte data explosion. Have others out there pondered this idea Yah I know we are essentially talking about re creating Google Maps here. Any insights would be..
Programmatically turn on bluetooth in the iphone sdk? http://stackoverflow.com/questions/1743610/programmatically-turn-on-bluetooth-in-the-iphone-sdk
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library longer needed. Details I found some answers on various forums blogs and apple docs. Now I try make short summary of my searches and experiments. Problem was caused by citation from apple Technical Q A QA1490 http developer.apple.com mac library qa qa2006 qa1490.html Objective C does not define linker symbols for each function.. a selector that is defined in the category. And their solution To resolve this issue the static library should pass the ObjC option 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.. to be loaded. This option allows you to target a specific archive. we can use force_load to reduce app binary size and to avoid conflicts wich all_load can cause in some cases. Yes it works with .a files added to the project. Yet I had troubles with lib project added as direct dependency. But later I found that it was my..
How does Apple know you are using private API? http://stackoverflow.com/questions/2842357/how-does-apple-know-you-are-using-private-api This can detect Undocumented C functions such as _UIImageWithName Objective C classes such as UIProgressHUD Ivars such as UITouch._phase which could be the cause of rejection of Three20 based apps last few months. 3. Listing Objective C selectors or strings Objective C selectors are stored in a special region of the binary..
iphone webkit css animations cause flicker http://stackoverflow.com/questions/2946748/iphone-webkit-css-animations-cause-flicker webkit css animations cause flicker This is the iphone site http www.thevisionairegroup.com projects accessorizer site After you click play now you'll get to a game. The guns will scroll..
http://stackoverflow.com/questions/3245733/apple-gyroscope-sample-code want to enable the gyro you could create an enableGyro method or just call it from the init method. The following will store the initial device attitude and cause the device to continue sampling the gyro and updating its attitude property. void enableGyro CMDeviceMotion deviceMotion motionManager.deviceMotion CMAttitude..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll with a predicate to retrieve the data for the primary TableView. I want to make sure I'm on the right path before I change too much code. I'm confused because so many of the examples are array based instead of CoreData. Here are some questions Do I need to have a second NSFetchedResultsController that retrieves only the.. NSString searchString self filterContentForSearchText searchString scope self.searchDisplayController.searchBar selectedScopeButtonIndex Return YES to cause the search result table view to be reloaded. return YES BOOL searchDisplayController UISearchDisplayController controller shouldReloadTableForSearchScope NSInteger.. filterContentForSearchText self.searchDisplayController.searchBar text scope self.searchDisplayController.searchBar selectedScopeButtonIndex Return YES to cause the search result table view to be reloaded. return YES make sure that you use the correct table view when getting updates from the FRC delegate methods void controllerWillChangeContent..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events after bootup With abusing this behavior you can make your app be looking like running forever . Register for one background process i.e. VoIP . This will cause your app to be restarted after termination. Now write some Task has to be finished code. According to Apple you have some time 5 seconds left to finish tasks. I.. to call an expirationhandler if you are finished with your work. In the code below you can see that i have a comment at the expirationHandler. This will cause your app running as long as the system allows your app to be running. All timers and threads stay running until iOS terminates your app. void applicationDidEnterBackground.. UIBackgroundTaskInvalid Be very spare with CPU Time here and your app runs longer But one thing is for sure your app will be terminated after a while. But because you registered your app as VoIP or one of the others the system restarts the app in background which will restart your background process With this PingPong I can..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now for experts. The Bizarre Problem That Arises.............................................. Even though a number of the methods work they don't actually work because there is a bizarre progressive slow down artifact you will see clearly in the demo. Scroll to the 'answer' I pasted in below showing the console output you can.. methods. Practical solutions ........................ For anyone reading in the future if you are actually unable to get this to work in production code because of the mystery progressive slowdown ... Felz and Void have each presented astounding solutions in the other specific question hope it helps. iphone ios cocoa quartz.. lengthy calculations etc. will prevent the interface updates from being started. Additionally anything that runs for a while on the main thread will also cause your touch handling to be unresponsive. This means that there is no way to force a UI refresh to occur from some other point in a process running on the main thread...
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because its selector is unknown ... may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because its selector is unknown . Here's what I'm.. may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because its selector is unknown . Here's what I'm doing _controller performSelector NSSelectorFromString @ someMethod Why do I get this warning I understand..
When is layoutSubviews called? http://stackoverflow.com/questions/728372/when-is-layoutsubviews-called I had a similar question but wasn't satisfied with the answer or any I could find on the net so I tried it in practice and here is what I got init does not cause layoutSubviews to be called duh addSubview causes layoutSubviews to be called on the view being added the view it ™s being added to target view and all the subviews.. with the answer or any I could find on the net so I tried it in practice and here is what I got init does not cause layoutSubviews to be called duh addSubview causes layoutSubviews to be called on the view being added the view it ™s being added to target view and all the subviews of the target view setFrame intelligently calls.. setFrame intelligently calls layoutSubviews on the view having it ™s frame set only if the size parameter of the frame is different scrolling a UIScrollView causes layoutSubviews to be called on the scrollView and it ™s superview rotating a device only calls layoutSubview on the parent view the responding viewControllers primary..
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample to move the item to iCloud. Never call this method from your app ™s main thread doing so could block your main thread for an extended period of time or cause a deadlock with one of your app ™s own file presenters. When you move a file or directory to iCloud the system copies that item out of your app sandbox and into..
Transparent Modal View on Navigation Controller http://stackoverflow.com/questions/849458/transparent-modal-view-on-navigation-controller navigation bar but it will cover the entire view below it. I tried playing around with the origin of the frame used to init the modalView but negative values cause it to not display. The best method that I found to cover the entire screen besides the status bar is to add the modalView as a subview of the window itself TransparentModalViewAppDelegate..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons that treats an id as a void . Things like C arrays of id can take a little more thinking about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this in any case. You cannot put an id in a struct . This is fairly.. and non ARC code you will have memory problems. ARC uses KVC naming to make decisions about memory management. If it's all ARC code then it doesn't matter because it will do it the same wrong on both sides. But if it's mixed ARC non ARC then there's a mismatch. ARC will leak memory during ObjC exception throws. An ObjC exception..
UIScrollView. Any thoughts on implementing “infinite” scroll/zoom? http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom scrollView.contentSize is fixed at creation time. 2 zooming can blow any lazy loading scheme all to hell since it can cause infinte data explosion. Have others out there pondered this idea Yah I know we are essentially talking about re creating..
Programmatically turn on bluetooth in the iphone sdk? http://stackoverflow.com/questions/1743610/programmatically-turn-on-bluetooth-in-the-iphone-sdk
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library on various forums blogs and apple docs. Now I try make short summary of my searches and experiments. Problem was caused by citation from apple Technical Q A QA1490 http developer.apple.com mac library qa qa2006 qa1490.html Objective C does.. And their solution To resolve this issue the static library should pass the ObjC option 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.. to target a specific archive. we can use force_load to reduce app binary size and to avoid conflicts wich all_load can cause in some cases. Yes it works with .a files added to the project. Yet I had troubles with lib project added as direct dependency...
How does Apple know you are using private API? http://stackoverflow.com/questions/2842357/how-does-apple-know-you-are-using-private-api such as _UIImageWithName Objective C classes such as UIProgressHUD Ivars such as UITouch._phase which could be the cause of rejection of Three20 based apps last few months. 3. Listing Objective C selectors or strings Objective C selectors are..
iphone webkit css animations cause flicker http://stackoverflow.com/questions/2946748/iphone-webkit-css-animations-cause-flicker webkit css animations cause flicker This is the iphone site http www.thevisionairegroup.com projects accessorizer site After you click play now you'll..
http://stackoverflow.com/questions/3245733/apple-gyroscope-sample-code an enableGyro method or just call it from the init method. The following will store the initial device attitude and cause the device to continue sampling the gyro and updating its attitude property. void enableGyro CMDeviceMotion deviceMotion..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll for the primary TableView. I want to make sure I'm on the right path before I change too much code. I'm confused because so many of the examples are array based instead of CoreData. Here are some questions Do I need to have a second NSFetchedResultsController.. searchString scope self.searchDisplayController.searchBar selectedScopeButtonIndex Return YES to cause the search result table view to be reloaded. return YES BOOL searchDisplayController UISearchDisplayController controller.. text scope self.searchDisplayController.searchBar selectedScopeButtonIndex Return YES to cause the search result table view to be reloaded. return YES make sure that you use the correct table view when getting updates..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events you can make your app be looking like running forever . Register for one background process i.e. VoIP . This will cause your app to be restarted after termination. Now write some Task has to be finished code. According to Apple you have some.. are finished with your work. In the code below you can see that i have a comment at the expirationHandler. This will cause your app running as long as the system allows your app to be running. All timers and threads stay running until iOS terminates.. with CPU Time here and your app runs longer But one thing is for sure your app will be terminated after a while. But because you registered your app as VoIP or one of the others the system restarts the app in background which will restart your background..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now Even though a number of the methods work they don't actually work because there is a bizarre progressive slow down artifact you will see clearly in the demo. Scroll to the 'answer' I pasted in below.. For anyone reading in the future if you are actually unable to get this to work in production code because of the mystery progressive slowdown ... Felz and Void have each presented astounding solutions in the other specific question.. the interface updates from being started. Additionally anything that runs for a while on the main thread will also cause your touch handling to be unresponsive. This means that there is no way to force a UI refresh to occur from some other point..
iPhone Codesign object file format invalid or unsuitable http://stackoverflow.com/questions/4842717/iphone-codesign-object-file-format-invalid-or-unsuitable invalid or unsuitable Connad usr bin codesign failed with exit code 1 I already tried to clean targets. what could cause this problem and how to solve it iphone codesign share improve this question May also be an issue with your install...
Save An Image To Application Documents Folder From UIView On IOS http://stackoverflow.com/questions/6821517/save-an-image-to-application-documents-folder-from-uiview-on-ios tried several methods to get this to work but can't get a grasp on it. For the first time in my life I've wanted to cause physical harm to an inanimate object but I've managed to restrain myself. I'd like to be able to save the image the user..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause.. may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because.. a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because its selector is unknown . Here's what I'm doing _controller performSelector NSSelectorFromString @ someMethod..
When is layoutSubviews called? http://stackoverflow.com/questions/728372/when-is-layoutsubviews-called with the answer or any I could find on the net so I tried it in practice and here is what I got init does not cause layoutSubviews to be called duh addSubview causes layoutSubviews to be called on the view being added the view it ™s being.. net so I tried it in practice and here is what I got init does not cause layoutSubviews to be called duh addSubview causes layoutSubviews to be called on the view being added the view it ™s being added to target view and all the subviews of the.. on the view having it ™s frame set only if the size parameter of the frame is different scrolling a UIScrollView causes layoutSubviews to be called on the scrollView and it ™s superview rotating a device only calls layoutSubview on the parent..
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample call this method from your app ™s main thread doing so could block your main thread for an extended period of time or cause a deadlock with one of your app ™s own file presenters. When you move a file or directory to iCloud the system copies that..
Transparent Modal View on Navigation Controller http://stackoverflow.com/questions/849458/transparent-modal-view-on-navigation-controller view below it. I tried playing around with the origin of the frame used to init the modalView but negative values cause it to not display. The best method that I found to cover the entire screen besides the status bar is to add the modalView..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons like C arrays of id can take a little more thinking about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this in any case. You cannot.. problems. ARC uses KVC naming to make decisions about memory management. If it's all ARC code then it doesn't matter because it will do it the same wrong on both sides. But if it's mixed ARC non ARC then there's a mismatch. ARC will leak memory..
http://stackoverflow.com/questions/12681702/ios-app-missing-screenshot I DO NOT want to have my app support the iPhone 5's big screen yet Can I still submit my app without the screen shots Cause apple is sending me messages regarding these missing screenshots Thank you iphone objective c ios cocos2d iphone share..
What's a reliable way to make an iOS app crash? [closed] http://stackoverflow.com/questions/13510584/whats-a-reliable-way-to-make-an-ios-app-crash get caught by Cocoa and thus don't result in the app crashing. iphone objective c ios share improve this question Cause a bad access strcpy 0 bla Note while this works on any system I know in a future version of the C runtime OR the compiler..
How to remove the “white reflection” on the application icon? [duplicate] http://stackoverflow.com/questions/1453680/how-to-remove-the-white-reflection-on-the-application-icon phone a white reflection effect is automatically added on the icon.png Is there any way to remove te reflection effect Cause I can see that there are apps without the white reflection effect on the icons iphone cocoa touch icons share improve..
UIBarButtonItem Custom Background Appearance 'Jumping' after flip transition http://stackoverflow.com/questions/15261148/uibarbuttonitem-custom-background-appearance-jumping-after-flip-transition does this when I put the button in place in storyboard's instead of code. Only seems to happen on the horizontal flip. Cause Apparently it has something to do with using a custom font. Almost like it's not calculating the width right at first. Sample..
viewWillAppear, viewDidAppear not being called, not firing http://stackoverflow.com/questions/3560669/viewwillappear-viewdidappear-not-being-called-not-firing of digging to find the real answer. Symptom viewWillAppear viewDidAppear were not being called in my UIViewController. Cause Embedding a UINavigationController or UITabBarController my case in a UIViewController somehow interrupts with the calling..
interaction beyond bounds of uiview http://stackoverflow.com/questions/5432995/interaction-beyond-bounds-of-uiview other control for that matter to receive touch events when the UIButton's frame lies outside of it's parent's frame Cause when I try this my UIButton doesn't seem to be able to receive any events. How do I work around this iphone objective c..
UIScrollView, reaching the bottom of the scroll view http://stackoverflow.com/questions/6217900/uiscrollview-reaching-the-bottom-of-the-scroll-view scrollView called when scroll view grinds to a halt However it doesn't necessarily mean you are at the bottom. Cause if you use your finger scroll a bit then it decelerates but you are not actually at the bottom of your scroll view then..
UIViewController retain count problem http://stackoverflow.com/questions/7483260/uiviewcontroller-retain-count-problem Run in instruments in Allocations set Record reference counts on on you have to stop recording to set the option . Cause the picker to run stop recording search for there ivar datePickerView drill down and you will be able to see where all retains..
UISearchDisplayController causes crash after viewDidUnload http://stackoverflow.com/questions/8567525/uisearchdisplaycontroller-causes-crash-after-viewdidunload a view controller in a storyboard with a UISearchDisplayController Push a new view controller on the navigation stack Cause a low memory warning Pop the controller off of the stack KABOOM viewDidLoad does not even get called on the first view controller..
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