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2014/10/15 ¤U¤È 10:03:35
iphone Programming Glossary: allowsDifference between objectForKey and valueForKey? http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey can have the same index . valueForKey is a KVC method. It works with ANY class. valueForKey allows you to access a property using a string for its name. So for instance if I have an Account class with..
How to programmatically send SMS on the iPhone? http://stackoverflow.com/questions/10848/how-to-programmatically-send-sms-on-the-iphone the user can initiate the SMS send within the controller. Unlike using the sms ... url format this allows your application to stay open and allows you to populate both the to and the body fields. You can even.. the controller. Unlike using the sms ... url format this allows your application to stay open and allows you to populate both the to and the body fields. You can even specify multiple recipients. This prevents.. fully automated SMS from the iPhone itself it requires some user interaction. But this at least allows you to populate everything and avoids closing the application. The MFMessageComposeViewController class..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs horizontal paging like Mobile Safari tabs Mobile Safari allows you to switch pages by entering a sort of UIScrollView horizontal paging view with a page control at..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library static archive library. Note all_load forces all members of all archives 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..
What is the best way to enter numeric values with decimal points? http://stackoverflow.com/questions/276382/what-is-the-best-way-to-enter-numeric-values-with-decimal-points separator and thus no need to even worry about fractional amounts. This approach to the problem allows you to use the stock numeric input keypad provided by Apple without the headaches of custom keypads..
How do I associate file types with an iPhone application? http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application one year ago and since then Apple introduced 'Document Support' which goes a step further and allows apps to associate with file types. There is a lot of talk in the documentation about how to set up your..
What does the -all_load linker flag do? http://stackoverflow.com/questions/2906147/what-does-the-all-load-linker-flag-do it sees even those without Objective C code. force_load is available in Xcode 3.2 and later. It allows finer grain control of archive loading. Each force_load option must be followed by a path to an archive..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework a complex number. The documentation overview explains this packing. it is quite neat basically it allows the complex results of the transform to be packed into the same memory footprint as the real but weirdly..
iVar property, access via self? http://stackoverflow.com/questions/4088801/ivar-property-access-via-self a defined property for an ivar you should use it rather than accessing the ivar directly. That allows subclasses to override the setter getter and do something different to just fetching the value from..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events backgrounding enabled in my plist. All the code here is done in your AppDelegate if the iOS device allows background execution this Handler will be called void backgroundHandler NSLog @ ### VOIP backgrounding.. 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.. infinite execution in background Header UIBackgroundTaskIdentifier bgTask Code if the iOS device allows background execution this Handler will be called void backgroundHandler NSLog @ ### VOIP backgrounding..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app posted below and pointed out that there's a new feature in iOS 6 called 'guided access' that allows you to lock a device to a specific app. It's a pity this feature wasn't available a year ago would have..
Changing Tint / Background color of UITabBar http://stackoverflow.com/questions/571028/changing-tint-background-color-of-uitabbar color of UITabBar The UINavigationBar and UISearchBar both have a tintColor property that allows you to change the tint color surprising I know of both of those items. I want to do the same thing to..
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 you could run into similar problems with not declaring how that method consumes parameters. ARC allows for declaring consumed parameters and if the method consumes the parameter you'll probably eventually..
http://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su present a SOLID CODE EXAMPLE on a way to change view controllers without the above limitations and allows for animated transitions between them A close example but no animation How to use multiple iOS custom..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 from taking place at anything more than 8 9 FPS. Replacing this with the fast texture cache reads allows me to encode 720p video at 20 FPS now and the bottleneck has moved from the pixel reading to the OpenGL.. to the OpenGL ES processing and actual movie encoding parts of the pipeline. On an iPhone 4S this allows you to write 1080p video at a full 30 FPS. My implementation can be found within the GPUImageMovieWriter..
Difference between objectForKey and valueForKey? http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey objects can have the same key just as no two objects in an NSArray can have the same index . valueForKey is a KVC method. It works with ANY class. valueForKey allows you to access a property using a string for its name. So for instance if I have an Account class with a property accountNumber I can do the following NSNumber anAccountNumber..
How to programmatically send SMS on the iPhone? http://stackoverflow.com/questions/10848/how-to-programmatically-send-sms-on-the-iphone into your application. You prepopulate the SMS fields then the user can initiate the SMS send within the controller. Unlike using the sms ... url format this allows your application to stay open and allows you to populate both the to and the body fields. You can even specify multiple recipients. This prevents applications from.. SMS fields then the user can initiate the SMS send within the controller. Unlike using the sms ... url format this allows your application to stay open and allows you to populate both the to and the body fields. You can even specify multiple recipients. This prevents applications from sending automated SMS without the user.. without the user explicitly aware of it. You still cannot send fully automated SMS from the iPhone itself it requires some user interaction. But this at least allows you to populate everything and avoids closing the application. The MFMessageComposeViewController class is well documented and tutorials show how easy it is to..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs horizontal paging like Mobile Safari tabs Mobile Safari allows you to switch pages by entering a sort of UIScrollView horizontal paging view with a page control at the bottom. I am trying to replicate this particular behavior..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library path_to_archive Loads all members of the specified static archive library. Note all_load forces all members of all archives 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..
What is the best way to enter numeric values with decimal points? http://stackoverflow.com/questions/276382/what-is-the-best-way-to-enter-numeric-values-with-decimal-points
How do I associate file types with an iPhone application? http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application could be associated with custom URL protocols. That was almost one year ago and since then Apple introduced 'Document Support' which goes a step further and allows apps to associate with file types. There is a lot of talk in the documentation about how to set up your app to launch other appropriate apps when it encounters..
What does the -all_load linker flag do? http://stackoverflow.com/questions/2906147/what-does-the-all-load-linker-flag-do forces the linker to load all object files from every archive it sees even those without Objective C code. force_load is available in Xcode 3.2 and later. It allows finer grain control of archive loading. Each force_load option must be followed by a path to an archive and every object file in that archive will be loaded. ..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework two real numbers DC offset Nyquist # masquerading as a complex number. The documentation overview explains this packing. it is quite neat basically it allows the complex results of the transform to be packed into the same memory footprint as the real but weirdly packaged inputs. vDSP_fft_zrip setupReal A stride log2n..
iVar property, access via self? http://stackoverflow.com/questions/4088801/ivar-property-access-via-self c cocoa touch share improve this question If you have a defined property for an ivar you should use it rather than accessing the ivar directly. That allows subclasses to override the setter getter and do something different to just fetching the value from the ivar. The only exception is in init methods and dealloc...
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events system . This we will abuse later. In my case I used VoIP backgrounding enabled in my plist. All the code here is done in your AppDelegate if the iOS device allows background execution this Handler will be called void backgroundHandler NSLog @ ### VOIP backgrounding callback try to do sth. According to Apple we have ONLY 30.. 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 UIApplication application UIApplication.. minimumtime setKeepAliveTimeout 600 . So THIS code leads into infinite execution in background Header UIBackgroundTaskIdentifier bgTask Code if the iOS device allows background execution this Handler will be called void backgroundHandler NSLog @ ### VOIP backgrounding callback UIApplication app UIApplication sharedApplication..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app http ipadhire.co.nz lockdown.mobileconfig EDIT EDIT brainray posted below and pointed out that there's a new feature in iOS 6 called 'guided access' that allows you to lock a device to a specific app. It's a pity this feature wasn't available a year ago would have saved us a bit of hassle EDIT EDIT EDIT iOS 7 now includes..
Changing Tint / Background color of UITabBar http://stackoverflow.com/questions/571028/changing-tint-background-color-of-uitabbar Tint Background color of UITabBar The UINavigationBar and UISearchBar both have a tintColor property that allows you to change the tint color surprising I know of both of those items. I want to do the same thing to the UITabBar in my application but have found now way to change..
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 same warning will occur with performSelector withObject and you could run into similar problems with not declaring how that method consumes parameters. ARC allows for declaring consumed parameters and if the method consumes the parameter you'll probably eventually send a message to a zombie and crash. There are ways to work..
http://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su ideal but cannot be used in all projects. Can someone present a SOLID CODE EXAMPLE on a way to change view controllers without the above limitations and allows for animated transitions between them A close example but no animation How to use multiple iOS custom view controllers without a navigation controller Edit Nav..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 video frames for encoding to disk. It limited the encoding from taking place at anything more than 8 9 FPS. Replacing this with the fast texture cache reads allows me to encode 720p video at 20 FPS now and the bottleneck has moved from the pixel reading to the OpenGL ES processing and actual movie encoding parts of the pipeline... FPS now and the bottleneck has moved from the pixel reading to the OpenGL ES processing and actual movie encoding parts of the pipeline. On an iPhone 4S this allows you to write 1080p video at a full 30 FPS. My implementation can be found within the GPUImageMovieWriter class within my open source GPUImage framework but it was..
Difference between objectForKey and valueForKey? http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey two objects in an NSArray can have the same index . valueForKey is a KVC method. It works with ANY class. valueForKey allows you to access a property using a string for its name. So for instance if I have an Account class with a property accountNumber..
How to programmatically send SMS on the iPhone? http://stackoverflow.com/questions/10848/how-to-programmatically-send-sms-on-the-iphone the SMS fields then the user can initiate the SMS send within the controller. Unlike using the sms ... url format this allows your application to stay open and allows you to populate both the to and the body fields. You can even specify multiple.. the SMS send within the controller. Unlike using the sms ... url format this allows your application to stay open and allows you to populate both the to and the body fields. You can even specify multiple recipients. This prevents applications from.. You still cannot send fully automated SMS from the iPhone itself it requires some user interaction. But this at least allows you to populate everything and avoids closing the application. The MFMessageComposeViewController class is well documented..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs horizontal paging like Mobile Safari tabs Mobile Safari allows you to switch pages by entering a sort of UIScrollView horizontal paging view with a page control at the bottom. I am trying..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library of the specified static archive library. Note all_load forces all members of all archives 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..
What is the best way to enter numeric values with decimal points? http://stackoverflow.com/questions/276382/what-is-the-best-way-to-enter-numeric-values-with-decimal-points there is no decimal separator and thus no need to even worry about fractional amounts. This approach to the problem allows you to use the stock numeric input keypad provided by Apple without the headaches of custom keypads regex validation etc...
How do I associate file types with an iPhone application? http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application That was almost one year ago and since then Apple introduced 'Document Support' which goes a step further and allows apps to associate with file types. There is a lot of talk in the documentation about how to set up your app to launch other..
What does the -all_load linker flag do? http://stackoverflow.com/questions/2906147/what-does-the-all-load-linker-flag-do from every archive it sees even those without Objective C code. force_load is available in Xcode 3.2 and later. It allows finer grain control of archive loading. Each force_load option must be followed by a path to an archive and every object..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework # masquerading as a complex number. The documentation overview explains this packing. it is quite neat basically it allows the complex results of the transform to be packed into the same memory footprint as the real but weirdly packaged inputs...
iVar property, access via self? http://stackoverflow.com/questions/4088801/ivar-property-access-via-self question If you have a defined property for an ivar you should use it rather than accessing the ivar directly. That allows subclasses to override the setter getter and do something different to just fetching the value from the ivar. The only exception..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events my case I used VoIP backgrounding enabled in my plist. All the code here is done in your AppDelegate if the iOS device allows background execution this Handler will be called void backgroundHandler NSLog @ ### VOIP backgrounding callback try to do.. 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.. THIS code leads into infinite execution in background Header UIBackgroundTaskIdentifier bgTask Code if the iOS device allows background execution this Handler will be called void backgroundHandler NSLog @ ### VOIP backgrounding callback UIApplication..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app EDIT EDIT brainray posted below and pointed out that there's a new feature in iOS 6 called 'guided access' that allows you to lock a device to a specific app. It's a pity this feature wasn't available a year ago would have saved us a bit of..
Changing Tint / Background color of UITabBar http://stackoverflow.com/questions/571028/changing-tint-background-color-of-uitabbar Tint Background color of UITabBar The UINavigationBar and UISearchBar both have a tintColor property that allows you to change the tint color surprising I know of both of those items. I want to do the same thing to the UITabBar in my..
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 withObject and you could run into similar problems with not declaring how that method consumes parameters. ARC allows for declaring consumed parameters and if the method consumes the parameter you'll probably eventually send a message to..
http://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su Can someone present a SOLID CODE EXAMPLE on a way to change view controllers without the above limitations and allows for animated transitions between them A close example but no animation How to use multiple iOS custom view controllers without..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 limited the encoding from taking place at anything more than 8 9 FPS. Replacing this with the fast texture cache reads allows me to encode 720p video at 20 FPS now and the bottleneck has moved from the pixel reading to the OpenGL ES processing and.. the pixel reading to the OpenGL ES processing and actual movie encoding parts of the pipeline. On an iPhone 4S this allows you to write 1080p video at a full 30 FPS. My implementation can be found within the GPUImageMovieWriter class within my..
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