¡@
2014/10/15 ¤U¤È 10:05:30
iphone Programming Glossary: containWhen should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc the most important reasons for implementing it is that UIViewController subclasses commonly also contain owning references to various subviews in the view hierarchy. These properties could have been set through.. by the view they will not actually be deallocated because the UIViewController itself still contains its own outstanding retaining references to those objects as well. Releasing the UIViewController's..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs I had to do this very recently was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame of what you would assume the.. its BOOL pointInside CGPoint point withEvent UIEvent event method however you will still need a container view to do the clipping and it may be difficult to determine when to return YES based only on the..
gcc-4.2 failed with exit code 1 iphone http://stackoverflow.com/questions/1248520/gcc-4-2-failed-with-exit-code-1-iphone
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone Draw the image to the bitmap context. The memory allocated for the context for rendering will then contain the raw image pixelData in the specified color space. CGRect rect 0 0 self.size.width self.size.height..
Symbolicating iPhone App Crash Reports http://stackoverflow.com/questions/1460892/symbolicating-iphone-app-crash-reports just rename the extention .ipa with .zip extract it then we can get a Payload Folder which contain app. In this case we don't need .dSYM file. Note This can only work if the app binary does not have..
http://stackoverflow.com/questions/18736954/missing-recommended-icon-file-the-bundle-does-not-contain-an-app-icon-for-iph recommended icon file The bundle does not contain an app icon for iPhone iPod Touch of exactly '120x120' pixels in .png format' I submitted an app update.. an email telling me this error has occurred Missing recommended icon file The bundle does not contain an app icon for iPhone iPod Touch of exactly '120x120' pixels in .png format How can I fix this problem..
Does my application “contain encryption”? http://stackoverflow.com/questions/2135081/does-my-application-contain-encryption my application &ldquo contain encryption&rdquo I'm uploading a binary for the first time. iTunes Connect has asked me Export laws.. a binary for the first time. iTunes Connect has asked me Export laws require that products containing encryption be properly authorized for export. Failure to comply could result in severe penalties... to comply could result in severe penalties. For further information click here. Does your product contain encryption I use https but only via NSURLConnection and UIWebView . My reading of this is that my app..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library application it will allow the successful creation of effective Objective C static libraries that contain categories on existing classes. and there is also recommendation in iPhone Development FAQ How do I..
What does the -all_load linker flag do? http://stackoverflow.com/questions/2906147/what-does-the-all-load-linker-flag-do there is a linker bug that prevents ObjC from loading objects files from static libraries that contain only categories and no classes. The workaround is to use the all_load or force_load flags. all_load..
Can I make POST or GET requests from an iphone application? http://stackoverflow.com/questions/319463/can-i-make-post-or-get-requests-from-an-iphone-application connectionDidFinishLoading NSURLConnection connection Once this method is invoked responseData contains the complete result This will send a GET. By the time the final method is called responseData will.. the complete result This will send a GET. By the time the final method is called responseData will contain the entire HTTP response convert to string with NSString alloc initWithData encoding . Alternately for..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework some bobbins setupReal and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2 complex numbers. These represent n 2 frequency bins bin 1 .idealFreq 44Hz ie The lowest frequency.. stored on the real side. this is probably the hardest thing to understand. We are using the same container A all the way through the process. so in the beginning we want to fill it with n real numbers. after.. we just precalculated vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD At this point A will be containing n 2 complex numbers only the first one is actually two real numbers DC offset Nyquist # masquerading..
http://stackoverflow.com/questions/3504173/detect-retina-display 2.0. You CANNOT assume a device is running iOS4 if the scale property exists as the iPad 3.2 also contains this property. On an iPad running iOS3.2 scale will return 1.0 in 1x mode and 2.0 in 2x mode even though.. scale will return 1.0 in 1x mode and 2.0 in 2x mode even though we know that device does not contain a Retina display. Apple changed this behavior in iOS4.2 for the iPad it returns 1.0 in both 1x and 2x..
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell corners for cells in the middle of a section and rounded on all 4 corners for sections that contain one cell. Unfortunately I couldn't figure out how to have this mode set automatically so I had to set..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll changing the predicate in the handleSearchForTerm searchString method Does the predicate have to contain the initial predicate as well as the search terms or does it remember that it used a predicate to retrieve..
Access the camera with iPhone SDK http://stackoverflow.com/questions/74113/access-the-camera-with-iphone-sdk picker didFinishPickingMediaWithInfo NSDictionary info The dictionary info will contain entries for the original and the edited image keyed with UIImagePickerControllerOriginalImage and UIImagePickerControllerEditedImage..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview encoding NSASCIIStringEncoding error &error After running this code googlePage will contain the HTML for www.google.com and error will contain any errors encountered in the fetch. You should check.. &error After running this code googlePage will contain the HTML for www.google.com and error will contain any errors encountered in the fetch. You should check the contents of error after the fetch. Going the..
When should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc to elaborate more about logic behind viewDidUnload . One of the most important reasons for implementing it is that UIViewController subclasses commonly also contain owning references to various subviews in the view hierarchy. These properties could have been set through IBOutlets when loading from a nib or programmatically.. to save memory through which the subviews are also released by the view they will not actually be deallocated because the UIViewController itself still contains its own outstanding retaining references to those objects as well. Releasing the UIViewController's additional ownership of these objects ensures they will be..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs the range of the UIScrollView 's frame. My solution when I had to do this very recently was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame of what you would assume the UIScrollView would have under normal circumstances. Place.. Another option would be to subclass UIScrollView and override its BOOL pointInside CGPoint point withEvent UIEvent event method however you will still need a container view to do the clipping and it may be difficult to determine when to return YES based only on the UIScrollView 's frame. NOTE You should also take a look at Juri..
gcc-4.2 failed with exit code 1 iphone http://stackoverflow.com/questions/1248520/gcc-4-2-failed-with-exit-code-1-iphone
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone if context free pixelData NSLog @ Context not created Draw the image to the bitmap context. The memory allocated for the context for rendering will then contain the raw image pixelData in the specified color space. CGRect rect 0 0 self.size.width self.size.height CGContextDrawImage context rect self.CGImage Now we can get..
Symbolicating iPhone App Crash Reports http://stackoverflow.com/questions/1460892/symbolicating-iphone-app-crash-reports functionName 510 Symbolicating IPA if we use IPA for symbolicating just rename the extention .ipa with .zip extract it then we can get a Payload Folder which contain app. In this case we don't need .dSYM file. Note This can only work if the app binary does not have symbols stripped. By default release builds stripped the symbols...
http://stackoverflow.com/questions/18736954/missing-recommended-icon-file-the-bundle-does-not-contain-an-app-icon-for-iph recommended icon file The bundle does not contain an app icon for iPhone iPod Touch of exactly '120x120' pixels in .png format' I submitted an app update but I have received an email telling me this error has.. in .png format' I submitted an app update but I have received an email telling me this error has occurred Missing recommended icon file The bundle does not contain an app icon for iPhone iPod Touch of exactly '120x120' pixels in .png format How can I fix this problem Here are the current icon requirements from Apple. I could..
Does my application “contain encryption”? http://stackoverflow.com/questions/2135081/does-my-application-contain-encryption my application &ldquo contain encryption&rdquo I'm uploading a binary for the first time. iTunes Connect has asked me Export laws require that products containing encryption be properly authorized.. my application &ldquo contain encryption&rdquo I'm uploading a binary for the first time. iTunes Connect has asked me Export laws require that products containing encryption be properly authorized for export. Failure to comply could result in severe penalties. For further information click here. Does your product contain.. encryption be properly authorized for export. Failure to comply could result in severe penalties. For further information click here. Does your product contain encryption I use https but only via NSURLConnection and UIWebView . My reading of this is that my app doesn't contain encryption but I'm wondering if this is spelled..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library executable due to additional object code loaded into the application it will allow the successful creation of effective Objective C static libraries that contain categories on existing classes. and there is also recommendation in iPhone Development FAQ How do I link all the Objective C classes in a static library Set the..
What does the -all_load linker flag do? http://stackoverflow.com/questions/2906147/what-does-the-all-load-linker-flag-do qa1490.html IMPORTANT For 64 bit and iPhone OS applications there is a linker bug that prevents ObjC from loading objects files from static libraries that contain only categories and no classes. The workaround is to use the all_load or force_load flags. all_load forces the linker to load all object files from every archive..
Can I make POST or GET requests from an iphone application? http://stackoverflow.com/questions/319463/can-i-make-post-or-get-requests-from-an-iphone-application connection didFailWithError NSError error Show error void connectionDidFinishLoading NSURLConnection connection Once this method is invoked responseData contains the complete result This will send a GET. By the time the final method is called responseData will contain the entire HTTP response convert to string with NSString.. Once this method is invoked responseData contains the complete result This will send a GET. By the time the final method is called responseData will contain the entire HTTP response convert to string with NSString alloc initWithData encoding . Alternately for POST replace the first block of code with NSMutableURLRequest..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate some bobbins setupReal and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2 complex numbers. These represent n 2 frequency bins bin 1 .idealFreq 44Hz ie The lowest frequency we can reliably detect is ONE complete wave within that window.. imaginary side of the split complex form and even reals in stored on the real side. this is probably the hardest thing to understand. We are using the same container A all the way through the process. so in the beginning we want to fill it with n real numbers. after the FFT it is going to be holding n 2 complex numbers. we.. everything. Now the actual transforms making use of the stuff we just precalculated vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD At this point A will be containing n 2 complex numbers only the first one is actually two real numbers DC offset Nyquist # masquerading as a complex number. The documentation overview explains..
http://stackoverflow.com/questions/3504173/detect-retina-display and if the UIScreen mainScreen .scale property is equal to 2.0. You CANNOT assume a device is running iOS4 if the scale property exists as the iPad 3.2 also contains this property. On an iPad running iOS3.2 scale will return 1.0 in 1x mode and 2.0 in 2x mode even though we know that device does not contain a Retina display... iPad 3.2 also contains this property. On an iPad running iOS3.2 scale will return 1.0 in 1x mode and 2.0 in 2x mode even though we know that device does not contain a Retina display. Apple changed this behavior in iOS4.2 for the iPad it returns 1.0 in both 1x and 2x modes. You can test this yourself in the simulator. I test..
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell rounded on the bottom for the last cell in a section no rounded corners for cells in the middle of a section and rounded on all 4 corners for sections that contain one cell. Unfortunately I couldn't figure out how to have this mode set automatically so I had to set it in the UITableViewDataSource's cellForRowAtIndexPath method...
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll same one is it as simple as clearing the FRC cache and then changing the predicate in the handleSearchForTerm searchString method Does the predicate have to contain the initial predicate as well as the search terms or does it remember that it used a predicate to retrieve data in the first place How do I get back to the original..
Access the camera with iPhone SDK http://stackoverflow.com/questions/74113/access-the-camera-with-iphone-sdk you'll need to implement void imagePickerController UIImagePickerController picker didFinishPickingMediaWithInfo NSDictionary info The dictionary info will contain entries for the original and the edited image keyed with UIImagePickerControllerOriginalImage and UIImagePickerControllerEditedImage respectively. see http developer.apple.com..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview error NSString googlePage NSString stringWithContentsOfURL googleURL encoding NSASCIIStringEncoding error &error After running this code googlePage will contain the HTML for www.google.com and error will contain any errors encountered in the fetch. You should check the contents of error after the fetch. Going the other.. googleURL encoding NSASCIIStringEncoding error &error After running this code googlePage will contain the HTML for www.google.com and error will contain any errors encountered in the fetch. You should check the contents of error after the fetch. Going the other way from a UIWebView is a bit trickier but is basically..
When should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc . One of the most important reasons for implementing it is that UIViewController subclasses commonly also contain owning references to various subviews in the view hierarchy. These properties could have been set through IBOutlets when.. subviews are also released by the view they will not actually be deallocated because the UIViewController itself still contains its own outstanding retaining references to those objects as well. Releasing the UIViewController's additional ownership..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs frame. My solution when I had to do this very recently was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame of what you would assume the UIScrollView would.. and override its BOOL pointInside CGPoint point withEvent UIEvent event method however you will still need a container view to do the clipping and it may be difficult to determine when to return YES based only on the UIScrollView 's frame...
gcc-4.2 failed with exit code 1 iphone http://stackoverflow.com/questions/1248520/gcc-4-2-failed-with-exit-code-1-iphone
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone not created Draw the image to the bitmap context. The memory allocated for the context for rendering will then contain the raw image pixelData in the specified color space. CGRect rect 0 0 self.size.width self.size.height CGContextDrawImage..
Symbolicating iPhone App Crash Reports http://stackoverflow.com/questions/1460892/symbolicating-iphone-app-crash-reports use IPA for symbolicating just rename the extention .ipa with .zip extract it then we can get a Payload Folder which contain app. In this case we don't need .dSYM file. Note This can only work if the app binary does not have symbols stripped. By..
http://stackoverflow.com/questions/18736954/missing-recommended-icon-file-the-bundle-does-not-contain-an-app-icon-for-iph recommended icon file The bundle does not contain an app icon for iPhone iPod Touch of exactly '120x120' pixels in .png format' I submitted an app update but I have received.. but I have received an email telling me this error has occurred Missing recommended icon file The bundle does not contain an app icon for iPhone iPod Touch of exactly '120x120' pixels in .png format How can I fix this problem Here are the current..
Does my application “contain encryption”? http://stackoverflow.com/questions/2135081/does-my-application-contain-encryption my application &ldquo contain encryption&rdquo I'm uploading a binary for the first time. iTunes Connect has asked me Export laws require that products.. I'm uploading a binary for the first time. iTunes Connect has asked me Export laws require that products containing encryption be properly authorized for export. Failure to comply could result in severe penalties. For further information.. for export. Failure to comply could result in severe penalties. For further information click here. Does your product contain encryption I use https but only via NSURLConnection and UIWebView . My reading of this is that my app doesn't contain encryption..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library code loaded into the application it will allow the successful creation of effective Objective C static libraries that contain categories on existing classes. and there is also recommendation in iPhone Development FAQ How do I link all the Objective..
What does the -all_load linker flag do? http://stackoverflow.com/questions/2906147/what-does-the-all-load-linker-flag-do iPhone OS applications there is a linker bug that prevents ObjC from loading objects files from static libraries that contain only categories and no classes. The workaround is to use the all_load or force_load flags. all_load forces the linker to..
Can I make POST or GET requests from an iphone application? http://stackoverflow.com/questions/319463/can-i-make-post-or-get-requests-from-an-iphone-application error Show error void connectionDidFinishLoading NSURLConnection connection Once this method is invoked responseData contains the complete result This will send a GET. By the time the final method is called responseData will contain the entire HTTP.. contains the complete result This will send a GET. By the time the final method is called responseData will contain the entire HTTP response convert to string with NSString alloc initWithData encoding . Alternately for POST replace the..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework 10 2^10 1024 precalculate some bobbins setupReal and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2 complex numbers. These represent n 2 frequency bins bin 1 .idealFreq 44Hz ie The lowest frequency we can reliably detect.. and even reals in stored on the real side. this is probably the hardest thing to understand. We are using the same container A all the way through the process. so in the beginning we want to fill it with n real numbers. after the FFT it is going.. use of the stuff we just precalculated vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD At this point A will be containing n 2 complex numbers only the first one is actually two real numbers DC offset Nyquist # masquerading as a complex number...
http://stackoverflow.com/questions/3504173/detect-retina-display property is equal to 2.0. You CANNOT assume a device is running iOS4 if the scale property exists as the iPad 3.2 also contains this property. On an iPad running iOS3.2 scale will return 1.0 in 1x mode and 2.0 in 2x mode even though we know that device.. On an iPad running iOS3.2 scale will return 1.0 in 1x mode and 2.0 in 2x mode even though we know that device does not contain a Retina display. Apple changed this behavior in iOS4.2 for the iPad it returns 1.0 in both 1x and 2x modes. You can test..
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell in a section no rounded corners for cells in the middle of a section and rounded on all 4 corners for sections that contain one cell. Unfortunately I couldn't figure out how to have this mode set automatically so I had to set it in the UITableViewDataSource's..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll FRC cache and then changing the predicate in the handleSearchForTerm searchString method Does the predicate have to contain the initial predicate as well as the search terms or does it remember that it used a predicate to retrieve data in the first..
Access the camera with iPhone SDK http://stackoverflow.com/questions/74113/access-the-camera-with-iphone-sdk UIImagePickerController picker didFinishPickingMediaWithInfo NSDictionary info The dictionary info will contain entries for the original and the edited image keyed with UIImagePickerControllerOriginalImage and UIImagePickerControllerEditedImage..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview googleURL encoding NSASCIIStringEncoding error &error After running this code googlePage will contain the HTML for www.google.com and error will contain any errors encountered in the fetch. You should check the contents of.. error &error After running this code googlePage will contain the HTML for www.google.com and error will contain any errors encountered in the fetch. You should check the contents of error after the fetch. Going the other way from a..
|