2014/10/15 下午 10:05:27
iphone Programming Glossary: considerHow to develop or migrate apps for iPhone 5 screen resolution? http://stackoverflow.com/questions/12395200/how-to-develop-or-migrate-apps-for-iphone-5-screen-resolution you have to check height of UIScreen mainScreen bounds or applicationFrame but then you need to consider status bar height if it's present as there seems to be no specific API for that. Example CGRect screenBounds..
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate] http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size extra 88 points in height would simply be black. If you only plan to support iOS 6 then definitely consider using Auto Layout. It removes all fixed layout handling and instead uses constraints to lay things out...
How can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone iphone filesystems share improve this question There are three kinds of writable paths to consider the first is Documents where you store things you want to keep and make available to the user through..
Is it even possible to change a UIButtons background color? http://stackoverflow.com/questions/2808888/is-it-even-possible-to-change-a-uibuttons-background-color ofcourse you'd have to #import QuartzCore QuartzCore.h edit to all new readers you should also consider a few options added as another possibility . for you consideration. As this is an old answer I strongly.. to all new readers you should also consider a few options added as another possibility . for you consideration. As this is an old answer I strongly recommend reading comments for troubleshooting share improve..
Is there a multiplatform framework for developing iPhone / Android applications? [closed] http://stackoverflow.com/questions/30953/is-there-a-multiplatform-framework-for-developing-iphone-android-applications port of the Flash API to Desktop Browser iOs Android Flash HTML5 etc. and is an option to consider for those coming from a Flash world. It builds to native binaries and targets browsers as well Flash..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file properly it worked fine for my needs. Second depending on the format layout of your PDF you might consider using Interface Builder to create a view that serves as a template for your PDF output. You would then..
How do I manage building a Lite vs Paid version of an iPhone app? http://stackoverflow.com/questions/549462/how-do-i-manage-building-a-lite-vs-paid-version-of-an-iphone-app building a Lite vs Paid version of an iPhone app I'm starting to get to the point where I want to consider building a lite version of my iPhone app. I've found a few things on the web that talk about the process..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers notes assignments and sample code and since the course was given by Apple dev's I definitely consider it to be from the horse's mouth . Class Website http www.stanford.edu class cs193p cgi bin index.php..
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 the header of the object type you're working with. 2 There are really only 4 things that ARC would consider for the return value 3 Ignore non object types void int etc Retain object value then release when it.. end up with a garbage pointer value being retained released and crash. Additional Arguments One consideration is that this is the same warning will occur with performSelector withObject and you could run into..
http://stackoverflow.com/questions/8086584/objective-c-url-encoding the correct encoding in this case it will not encode anything returning the same string. Note consider if this set of characters meet your needs if not change them as needed. RFC 3986 characters requiring..
http://stackoverflow.com/questions/905542/how-to-write-data-in-plist .app bundle you are probably doing something wrong. If you want to store preferences you should consider using NSUserDefaults . If you really want to modify a bundled .plist here is some code NSString plistPath..
How to develop or migrate apps for iPhone 5 screen resolution? http://stackoverflow.com/questions/12395200/how-to-develop-or-migrate-apps-for-iphone-5-screen-resolution to do for the larger screen specifically then it looks like you have to check height of UIScreen mainScreen bounds or applicationFrame but then you need to consider status bar height if it's present as there seems to be no specific API for that. Example CGRect screenBounds UIScreen mainScreen bounds if screenBounds.size.height..
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate] http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size presentation. They will be letterboxed or basically the extra 88 points in height would simply be black. If you only plan to support iOS 6 then definitely consider using Auto Layout. It removes all fixed layout handling and instead uses constraints to lay things out. Nothing will be hard coded and your life will become a lot..
How can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone iPhone you are only allowed to write into specific locations. iphone filesystems share improve this question There are three kinds of writable paths to consider the first is Documents where you store things you want to keep and make available to the user through iTunes as of 3.2 NSArray paths NSSearchPathForDirectoriesInDomains..
Is it even possible to change a UIButtons background color? http://stackoverflow.com/questions/2808888/is-it-even-possible-to-change-a-uibuttons-background-color 0.5f loginButton.layer.cornerRadius 10.0f edit ofcourse you'd have to #import QuartzCore QuartzCore.h edit to all new readers you should also consider a few options added as another possibility . for you consideration. As this is an old answer I strongly recommend reading comments for troubleshooting share improve..
Is there a multiplatform framework for developing iPhone / Android applications? [closed] http://stackoverflow.com/questions/30953/is-there-a-multiplatform-framework-for-developing-iphone-android-applications as a native app too. http phonegap.com OpenFL is an opensource port of the Flash API to Desktop Browser iOs Android Flash HTML5 etc. and is an option to consider for those coming from a Flash world. It builds to native binaries and targets browsers as well Flash HTML5 . http www.openfl.org MonoGame is an open source implementation..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file with my project initially but once I got my project setup properly it worked fine for my needs. Second depending on the format layout of your PDF you might consider using Interface Builder to create a view that serves as a template for your PDF output. You would then write code to load the view fill in any data e.g. set text..
How do I manage building a Lite vs Paid version of an iPhone app? http://stackoverflow.com/questions/549462/how-do-i-manage-building-a-lite-vs-paid-version-of-an-iphone-app do I manage building a Lite vs Paid version of an iPhone app I'm starting to get to the point where I want to consider building a lite version of my iPhone app. I've found a few things on the web that talk about the process a bit namely http developer.apple.com tools XCode XCodeprojects.html..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers class notes that they have left on the web. It includes lecture notes assignments and sample code and since the course was given by Apple dev's I definitely consider it to be from the horse's mouth . Class Website http www.stanford.edu class cs193p cgi bin index.php Lecture 08 is related to an assignment to build a UINavigationController..
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 NSString id etc. ARC normally gets this information from the header of the object type you're working with. 2 There are really only 4 things that ARC would consider for the return value 3 Ignore non object types void int etc Retain object value then release when it is no longer used standard assumption Release new object values.. someMethod is returning a non object including void you could end up with a garbage pointer value being retained released and crash. Additional Arguments One consideration is that this is the same warning will occur with performSelector withObject and you could run into similar problems with not declaring how that method consumes..
http://stackoverflow.com/questions/8086584/objective-c-url-encoding Note stringByAddingPercentEscapesUsingEncoding will not produce the correct encoding in this case it will not encode anything returning the same string. Note consider if this set of characters meet your needs if not change them as needed. RFC 3986 characters requiring encoding added since it is the encoding prefix character #..
http://stackoverflow.com/questions/905542/how-to-write-data-in-plist question but if you want to write into a .plist within your .app bundle you are probably doing something wrong. If you want to store preferences you should consider using NSUserDefaults . If you really want to modify a bundled .plist here is some code NSString plistPath nil NSFileManager manager NSFileManager defaultManager..
Accessing Web Service from iPhone http://stackoverflow.com/questions/1018369/accessing-web-service-from-iphone of threading with web calls and take everything off the main thread. For security make HTTPS calls. You might want to consider using JSON for the call then this library is useful https github.com stig json framework However you should find it very..
http://stackoverflow.com/questions/1065628/uploading-video-with-iphone snippet builds the http post request and submits it. You will need to modify it if you want decent error handling and consider using a library that allows async upload theres one on github Also Notice the port 3000 on the server url above I found..
How to develop or migrate apps for iPhone 5 screen resolution? http://stackoverflow.com/questions/12395200/how-to-develop-or-migrate-apps-for-iphone-5-screen-resolution then it looks like you have to check height of UIScreen mainScreen bounds or applicationFrame but then you need to consider status bar height if it's present as there seems to be no specific API for that. Example CGRect screenBounds UIScreen mainScreen..
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate] http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size or basically the extra 88 points in height would simply be black. If you only plan to support iOS 6 then definitely consider using Auto Layout. It removes all fixed layout handling and instead uses constraints to lay things out. Nothing will be..
How can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone specific locations. iphone filesystems share improve this question There are three kinds of writable paths to consider the first is Documents where you store things you want to keep and make available to the user through iTunes as of 3.2 NSArray..
Is it even possible to change a UIButtons background color? http://stackoverflow.com/questions/2808888/is-it-even-possible-to-change-a-uibuttons-background-color 10.0f edit ofcourse you'd have to #import QuartzCore QuartzCore.h edit to all new readers you should also consider a few options added as another possibility . for you consideration. As this is an old answer I strongly recommend reading..
Practical rules for premature optimization [closed] http://stackoverflow.com/questions/2978460/practical-rules-for-premature-optimization I think this is just laziness and appalling to disciplined computer science. But it has occurred to me that maybe considering the complexity and performance of algorithms is going the way of assembly loop unrolling and other optimization techniques.. performance of algorithms is going the way of assembly loop unrolling and other optimization techniques that are now considered unnecessary. What do you think Are we at the point now where deciding between an O n^n and O n complexity algorithm is.. now where deciding between an O n^n and O n complexity algorithm is irrelevant What about O n vs O n n What do you consider premature optimization What practical rules do you use to consciously or unconsciously avoid it EDIT I know my description..
Is there a multiplatform framework for developing iPhone / Android applications? [closed] http://stackoverflow.com/questions/30953/is-there-a-multiplatform-framework-for-developing-iphone-android-applications OpenFL is an opensource port of the Flash API to Desktop Browser iOs Android Flash HTML5 etc. and is an option to consider for those coming from a Flash world. It builds to native binaries and targets browsers as well Flash HTML5 . http www.openfl.org..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file got my project setup properly it worked fine for my needs. Second depending on the format layout of your PDF you might consider using Interface Builder to create a view that serves as a template for your PDF output. You would then write code to load..
Getting displacement from accelerometer data with Core Motion http://stackoverflow.com/questions/4449565/getting-displacement-from-accelerometer-data-with-core-motion be very very cool Maybe you find these hints useful First of all to make things easy just look at one axis e.g x but consider both left x and right x to have a representable situation. Yes you are right you have to integrate twice to get the position..
http://stackoverflow.com/questions/4558639/sort-an-nsmutabledictionary that maps NSString to NSString although the values are NSStrings they are really just integers . For example consider the following mappings dog 4 cat 3 turtle 6 I'd like to end up with the top 10 entries in the dictionary sorted by decreasing..
NSMutableString as retain/copy http://stackoverflow.com/questions/4995254/nsmutablestring-as-retain-copy Is that true If yes can I just replace retain to copy in my app and remove the release in dealloc Do I need to consider some other things as well Also is it normal to have 10 11 NSMutableString's in 1 app..I mean from memory usage perspective.. the scope of traditional retain release mechanisms NS Type subclasses could implement another scheme although usual considerations of this are flawed Do I need to consider some other things as well now we get to the NSMutable type details. the implementation.. NS Type subclasses could implement another scheme although usual considerations of this are flawed Do I need to consider some other things as well now we get to the NSMutable type details. the implementation of property syntax invokes copy ...
How do I manage building a Lite vs Paid version of an iPhone app? http://stackoverflow.com/questions/549462/how-do-i-manage-building-a-lite-vs-paid-version-of-an-iphone-app do I manage building a Lite vs Paid version of an iPhone app I'm starting to get to the point where I want to consider building a lite version of my iPhone app. I've found a few things on the web that talk about the process a bit namely http..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers web. It includes lecture notes assignments and sample code and since the course was given by Apple dev's I definitely consider it to be from the horse's mouth . Class Website http www.stanford.edu class cs193p cgi bin index.php Lecture 08 is related..
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 information from the header of the object type you're working with. 2 There are really only 4 things that ARC would consider for the return value 3 Ignore non object types void int etc Retain object value then release when it is no longer used standard.. void you could end up with a garbage pointer value being retained released and crash. Additional Arguments One consideration is that this is the same warning will occur with performSelector withObject and you could run into similar problems..
http://stackoverflow.com/questions/8086584/objective-c-url-encoding will not produce the correct encoding in this case it will not encode anything returning the same string. Note consider if this set of characters meet your needs if not change them as needed. RFC 3986 characters requiring encoding added since..
Storyboard - refer to ViewController in AppDelegate http://stackoverflow.com/questions/8186375/storyboard-refer-to-viewcontroller-in-appdelegate refer to ViewController in AppDelegate consider the following scenario I have a storyboard based app. I add a ViewController object to the storyboard add the class files..
http://stackoverflow.com/questions/843534/flip-view-iphone View Iphone Dear All please consider the code below and tell me what I'm doing wrong. I want to flip between two UIViews. Somehow when I flip away from the initial..
http://stackoverflow.com/questions/905542/how-to-write-data-in-plist a .plist within your .app bundle you are probably doing something wrong. If you want to store preferences you should consider using NSUserDefaults . If you really want to modify a bundled .plist here is some code NSString plistPath nil NSFileManager..
Detect touches only on non-transparent pixels of UIImageView, efficiently http://stackoverflow.com/questions/13291919/detect-touches-only-on-non-transparent-pixels-of-uiimageview-efficiently of UIImageView efficiently How would you detect touches only on non transparent pixels of a UIImageView efficiently Consider an image like the one below displayed with UIImageView . The goal is be to make the gesture recognisers respond only when..
Page count of UICollectionView with paging in iOS http://stackoverflow.com/questions/13433432/page-count-of-uicollectionview-with-paging-in-ios count of UICollectionView with paging in iOS Consider a UICollectionView with flow layout and paging enabled by setting pagingEnabled to YES . What would be the simplest way..
http://stackoverflow.com/questions/14659563/to-drawrect-or-not-to-drawrect-when-should-one-use-drawrect-core-graphics-vs-su make sense to optimize that much ahead of time and do something the more difficult way before doing any profiling. Consider that I'm comfortable with both methods and now really want a deeper understanding. A lot of my confusion comes from learning..
Using a UISegmentedControl in the footer of UIPopoverController http://stackoverflow.com/questions/3284111/using-a-uisegmentedcontrol-in-the-footer-of-uipopovercontroller What you need is to set the toolbarItems of your top UIViewController in your UIPopover and configure it properly. Consider something like this NSArray segmentedItems NSArray arrayWithObjects @ Bookmarks @ Recents @ Contacts nil UISegmentedControl..
http://stackoverflow.com/questions/3320355/how-should-i-approach-building-a-universal-ios-app-that-will-include-ios-4-featu just remember the following two source code snippets Using classes only if they are available on the current device Consider this piece of code UILocalNotification n UILocalNotification alloc init When building a Universal App this code will lead..
Get zip code from latitude, longitude? http://stackoverflow.com/questions/3564852/get-zip-code-from-latitude-longitude countries that's why I don't want to use them. Any other idea or clue Thanks iphone share improve this question Consider the GeoNames web service . It's a complete geocoding reverse geocoding suite under a Creative Commons attribution license...
Max image width in Mobile Safari? Getting unwanted downscaling on panos http://stackoverflow.com/questions/3720316/max-image-width-in-mobile-safari-getting-unwanted-downscaling-on-panos fine in OS X Safari and in other browsers but on Mobile Safari there seems to be a limit on the maximum image width. Consider this web page http basepath.com public test1.html with this source DOCTYPE HTML html head meta name 'viewport' content 'width..
RESTful frameworks for Android, iOS…? http://stackoverflow.com/questions/4097686/restful-frameworks-for-android-ios object not just the ID Don't return IDs only category 2 3 4 should be category name testing id 2 name production id 3 Consider each call to be independent of each other i.e. I should have enough information for call http test.com object.json to populate..
Usage of NSException in iPhone Apps http://stackoverflow.com/questions/4310560/usage-of-nsexception-in-iphone-apps passes through system framework code. Sine the exception is by definition unrecoverable why pay the cost of cleanup Consider this call stack your code 1 system code your code 2 I.e. code where your code calls into system code which calls into more..
How to steal touches from UIScrollView? http://stackoverflow.com/questions/4629499/how-to-steal-touches-from-uiscrollview and send them instantly to a specific subview while maintaining the default behavior for the rest of the scroll view. Consider having a UIPickerView inside of a UITableView. The default behavior is that if you drag your finger over the picker view..
iPhone :Can we add more than One application in a Single application http://stackoverflow.com/questions/4634128/iphone-can-we-add-more-than-one-application-in-a-single-application and is it allowed by apple or not. thanks for your suggestion in advance. iphone share improve this question Consider these things as features. Weather information is a feature image processing is another and camera in another. You can create..
sample code for collision detection in iPhone sdk http://stackoverflow.com/questions/5620510/sample-code-for-collision-detection-in-iphone-sdk c share improve this question You can Detect Collision between two images by making rect for those image views. Consider my image views being named img_view1 and img_view2 . Image views creation For img_view1 rect parameters are x y width height..
Using NSMutableDictionary as backing store for properties http://stackoverflow.com/questions/5873776/using-nsmutabledictionary-as-backing-store-for-properties are at the language level KVC is at the framework level. You'll need to intercept the accessor messages instead. Consider implementing the resolveInstanceMethod class method in which you 禃esolve the selector by adding a method implementation..
NSString @property, using copy instead of retain http://stackoverflow.com/questions/587414/nsstring-property-using-copy-instead-of-retain copying just determines whether or not the object's property shares the same value with what you're setting it to. Consider the following code suppose the 'foo' property is declared 'retain' and the 'bar' property is declared 'copy' NSFoo foo .....
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c want to hang onto that string you'd need to call retain explicitly and then explicitly release it when you're done. Consider the following very contrived bit of code and you'll see a situation where autorelease is required NSString createHelloWorldString..
http://stackoverflow.com/questions/7269780/rest-web-services-in-iphone me null. How do i continue from here iphone objective c ios web services rest share improve this question Consider using NSURLConnection which has a callback for the result and also a callback to get detailed error details. It als doesn't..
http://stackoverflow.com/questions/7362199/iphone-correct-way-for-getting-current-date-and-time-for-a-given-place-timez you should not attempt to convert a date between time zones. NSDate objects represent an absolute instant in time. Consider the following example of how two date representations in different time zones 9 9 11 3 54 PM in Paris and 9 9 11 11 54 PM..
NSURLRequest - encode url for NSURLRequest POST Body (iPhone objective-C) http://stackoverflow.com/questions/787582/nsurlrequest-encode-url-for-nsurlrequest-post-body-iphone-objective-c the problem overkill for what I needed . iphone objective c cocoa cocoa touch http share improve this question Consider using Ben Copsey's ASIHTTPRequest framework for generating and sending synchronous and asynchronous HTTTP requests POST..
RSA Encryption-Decryption in iphone http://stackoverflow.com/questions/788569/rsa-encryption-decryption-in-iphone which is NSCFType object which is a struct __SecKey. iphone cryptography rsa keychain share improve this question Consider using NSData to get the string value and perhaps use Base64 or some other form of encoding when passing over the network..
Why is object not dealloc'ed when using ARC + NSZombieEnabled http://stackoverflow.com/questions/8408071/why-is-object-not-dealloced-when-using-arc-nszombieenabled to figure out why. I have Enable Zombie Objects on for my project while debugging and this turned out to be the cause. Consider the following app logic 1 Users invokes action in RootViewController that causes a SecondaryViewController to be created..
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