2014/10/15 下午 10:09:18
iphone Programming Glossary: fortunatelyExtracting a public key from key pair in key chain http://stackoverflow.com/questions/11467215/extracting-a-public-key-from-key-pair-in-key-chain a public key For an iPhone App I need to create a rsa key pair store it in the key chain and retrieve the public key. Fortunately Apple released a Crypto Exercise Sample where everything i need can be found class SecKeyWrapper functions generateKeyPair..
How to remove the last unicode symbol from NSString http://stackoverflow.com/questions/11759855/how-to-remove-the-last-unicode-symbol-from-nsstring to do what you want viz delete one character because it is really hard to tell how many unichars it takes up. Fortunately NSString has a method that helps with this rangeOfComposedCharacterSequenceAtIndex . What you need to do is get the index..
How to decrypt an encrypted Apple iTunes iPhone backup? http://stackoverflow.com/questions/1498342/how-to-decrypt-an-encrypted-apple-itunes-iphone-backup Miller et al. have released the iOS Hacker 䏭 Handbook which covers some of the same ground in a how to fashion. Fortunately B矇drune and Sigwald have open sourced their iphone dataprotection code . Decrypting the backup is as simple as running their..
http://stackoverflow.com/questions/16337362/kvc-vs-fast-enumeration in employees totalSalary employee.salary doubleValue double averageSalary totalSalary employees count versus... Fortunately Key Value Coding gives us a much more concise almost Ruby like way to do this employees valueForKeyPath @ @avg.salary KVC..
http://stackoverflow.com/questions/4813744/weird-crash-in-abpeoplepicker If you do a double ModalVC dismiss to ABPeoplePicker when the user clicks a person in search you'll get this crash. Fortunately there's a simple workaround return YES in your delegate's shouldContinueAfterSelectingPerson. As you're simultaneously dismissing..
Crash in ABPeoplePicker when called from another modal viewcontroller and both dismissed http://stackoverflow.com/questions/4856728/crash-in-abpeoplepicker-when-called-from-another-modal-viewcontroller-and-both-d if you do a double ModalVC dismiss to ABPeoplePicker when the user clicks a person in search you'll get this crash. Fortunately there's a simple workaround return YES in your delegate's shouldContinueAfterSelectingPerson. As you're simultaneously dismissing..
Can I avoid the native fullscreen video player with HTML5 on iPhone or android? http://stackoverflow.com/questions/5054560/can-i-avoid-the-native-fullscreen-video-player-with-html5-on-iphone-or-android property of a UIWebView . By default on iPhone this is set to NO but on iPad it's set to YES . Fortunately for you you can also adjust this behaviour in HTML as follows video id myVideo width 280 height 140 webkit playsinline ...that..
Point in Tilt Direction - iPhone http://stackoverflow.com/questions/5128861/point-in-tilt-direction-iphone equal to the adjustmentAngle .. hi Josh yes simply set the rotation to the final angle you calculate using the above Fortunately it's that simple. If you ever have to convert back fore between degrees and radians just paste in these lines of code that..
iPhone use of mutexes with asynchronous URL requests http://stackoverflow.com/questions/554270/iphone-use-of-mutexes-with-asynchronous-url-requests including classes will be accessed from two threads simultaneously you must take steps to keep these synchronized. Fortunately Objective C makes it ridiculously easy to do this using the synchronized keyword. This keywords takes as an argument any..
Why timer stops when scrolling in UIWebView iPhone? [duplicate] http://stackoverflow.com/questions/6684016/why-timer-stops-when-scrolling-in-uiwebview-iphone is blocked until the scrolling completely stops. And when the user continues to scroll the timer is blocked again. Fortunately the solution to this problem is quite simple You can add your timer to another NSRunLoopMode. When add the timer to NSRunLoopCommonModes..
iOS: different addSubview behavior between iOS 4.3 and 5.0 http://stackoverflow.com/questions/7830830/ios-different-addsubview-behavior-between-ios-4-3-and-5-0 hierarchy. These are called automatically in iOS 5 if the view is being added or removed from the window hierarchy. Fortunately iOS 5 has a method in UIViewController that you can override to revert the behaviour back to how it worked with iOS 4. Just..
How to debug “message sent to deallocated instance” in Xcode4? http://stackoverflow.com/questions/8298946/how-to-debug-message-sent-to-deallocated-instance-in-xcode4 and project with the clean commands several times and deleted the app in the Simulator several times as well. Update 2 Fortunately the problem re appeared. And now it seems persistent. Fortunately because I prefer finding the root cause rather than annoying.. app in the Simulator several times as well. Update 2 Fortunately the problem re appeared. And now it seems persistent. Fortunately because I prefer finding the root cause rather than annoying the users by random. Update 3 Finally found it by accident..
http://stackoverflow.com/questions/8859285/uibezierpath-subtract-path of what you want. What you need to do is intersect the existing clipping path with the inverse of smallMaskPath . Fortunately you can do that pretty easily using the even odd winding rule. You can read about the even odd rule in the Quartz 2D Programming..
Display encrypted file using QuickLook framework or UiDocumentInteractionController http://stackoverflow.com/questions/8917368/display-encrypted-file-using-quicklook-framework-or-uidocumentinteractioncontrol options are limited. You must give Quick Look an NSURL which means it must be on the file system or the Internet . Fortunately this shouldn't be much of a problem. iOS devices use hardware level encryption. When your file is encrypted only your app..
Getting info about bad memory address in LLDB http://stackoverflow.com/questions/9853100/getting-info-about-bad-memory-address-in-lldb backtrace. Unfortunately with the latest version of iOS and XCode a good stack track is sometimes hard to come by. Fortunately you can set an 'Exception Breakpoint' in XCode to allow you to examine this code prior to the EXC_BAD_ACCESS exception...
How to draw a gradient line (fading in/out) with Core Graphics/iPhone? http://stackoverflow.com/questions/1303855/how-to-draw-a-gradient-line-fading-in-out-with-core-graphics-iphone with CGContextStrokePath . For horizontal and vertical lines the solution is to use CGContextAddRect instead which fortunately is what I need. I replaced CGContextMoveToPoint context x y CGContextAddLineToPoint context x2 y2 CGContextStrokePath context..
Preventing an <input> element from scrolling the screen on iPhone? http://stackoverflow.com/questions/2952782/preventing-an-input-element-from-scrolling-the-screen-on-iphone
Retina icons (@2x) aren't being used when images are specified in code http://stackoverflow.com/questions/3442239/retina-icons-2x-arent-being-used-when-images-are-specified-in-code
How to create sectioned/grouped table view alphabetically http://stackoverflow.com/questions/4051009/how-to-create-sectioned-grouped-table-view-alphabetically . Additionally the items in each section array are sorted. You could build and sort this array of arrays yourself but fortunately the UILocalizedIndexedCollation class makes the tasks of building and sorting these data structures and providing data to..
App shows white screen on startup after upgrading to iOS 4.2 http://stackoverflow.com/questions/4266319/app-shows-white-screen-on-startup-after-upgrading-to-ios-4-2 I had written down from the iPhone Developer's Cookbook. The problem was not the SoundManager which still works fine fortunately but in the application didFinishLaunchingWithOptions method in the App Delegate class. Here is the code that causes the..
How to properly crop an image taken on iPhone 4G (with EXIF rotation data)? http://stackoverflow.com/questions/7203847/how-to-properly-crop-an-image-taken-on-iphone-4g-with-exif-rotation-data autorelease The second call embeds rotation information into the UIImage from the original image. Unfortunately that call isn't available on iOS 3.XX fortunately it is unlikely that you will encounter images with EXIF information on.. rotation information into the UIImage from the original image. Unfortunately that call isn't available on iOS 3.XX fortunately it is unlikely that you will encounter images with EXIF information on those devices because the camera's can't take photos..
http://stackoverflow.com/questions/7465713/how-to-detect-iap-crackers today that intercepts and then re sends genuine receipts there's now a bit more work needed on the server side. fortunately if you already have a verification server set up you should be able to do this without updating your app Two new requirements..
http://stackoverflow.com/questions/8144218/nssstring-encoding-not-found objective c share improve this question NSString does not support Windows Hebrew character encoding. CFString fortunately does support Windows Hebrew character encoding. Use CFStringConvertEncodingToNSStringEncoding to convert the CFStringEncoding..
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