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2014/10/15 ¤U¤È 10:10:13
iphone Programming Glossary: imagineidleTimerDisabled not working since iPhone 3.0 http://stackoverflow.com/questions/1058717/idletimerdisabled-not-working-since-iphone-3-0 in which case it locks again after the iPhone auto lock time setting. I'm amazed no one else has come across this as I imagine it would affect a large number of Apps. Just to clarify 1. The above code is in ApplicationDidFinishLaunching 2. I know..
Cocoa: What's the Difference between the frame and the bounds? http://stackoverflow.com/questions/1210047/cocoa-whats-the-difference-between-the-frame-and-the-bounds the rectangle expressed as a location x y and size width height relative to the superview it is contained within. So imagine a view that has a size of 100x100 width x height positioned at 25 25 x y of its superview. The following code prints out..
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 for table views however if your app used pixel perfect layout for displaying content then your best bet would be to re imagine the content so that it can accommodate varying heights. If that's not a possibility then the only remaining option is to..
How to detect iPhone 5 (widescreen devices)? http://stackoverflow.com/questions/12446990/how-to-detect-iphone-5-widescreen-devices rely on the screen size . UIScreen mainScreen bounds .size.height The iPhone 5's screen has a height of 568. You can imagine a macro to simplify all of this #define IS_IPHONE_5 fabs double UIScreen mainScreen bounds .size.height double 568 DBL_EPSILON..
iphone uiwebview download complete page with CSS and Images http://stackoverflow.com/questions/1720524/iphone-uiwebview-download-complete-page-with-css-and-images baseURL NSURL baseURL to load the HTML string. baseURL is used to specify the directory or site the webview will imagine the html string you hand it is located. All URLS will be relative to that. Note of course that this will not work very well..
http://stackoverflow.com/questions/2035421/creating-nsdecimal values. The underscores on the fields in the struct indicate that these are private and subject to change. I don't imagine that a lot of changes occur in the low level NSDecimal functions but I'd be nervous about things breaking at some point...
iphone/ipad orientation handling http://stackoverflow.com/questions/2815802/iphone-ipad-orientation-handling controls or even use different views for each orientation how on earth to people maintain their code base I can just imagine so many issues with spaghetti code thousands of if checks all over the place that it would drive me nuts to make one small..
UIDatePicker - Problem Localizing http://stackoverflow.com/questions/2894161/uidatepicker-problem-localizing though. The word for Today is translated. As seen in the attached screenshot. OK I'm not allowed to post images. But imagine a Date Time picker with May in English and Today written Ajourd'hui . Based on what I've read adding the UIDatePicker programatically..
ABAddressBook ABSource and ABSourceType http://stackoverflow.com/questions/3108413/abaddressbook-absource-and-absourcetype how to proceed beyond this point... As the whole source concept is a new to the ABAddressBook framework in 4.0 I don't imagine that folks have much experience with this but hoping someone might help me understand how to work with the above...thanks...
Xcode/GDB: How to get information about an exception that was just thrown? http://stackoverflow.com/questions/3327828/xcode-gdb-how-to-get-information-about-an-exception-that-was-just-thrown GDB How to get information about an exception that was just thrown OK so imagine that my breakpoint in objc_exception_throw has just triggered. I'm sitting at the debugger prompt and I want to get some..
Can use AVCaptureVideoDataOutput and AVCaptureMovieFileOutput at the same time? http://stackoverflow.com/questions/4944083/can-use-avcapturevideodataoutput-and-avcapturemoviefileoutput-at-the-same-time NSNumber numberWithInt kCVPixelFormatType_32BGRA kCVPixelBufferPixelFormatTypeKey nil that's going to go somewhere I imagine you've got the URL for that sorted so create a suitable asset writer we'll put our H.264 within the normal MPEG4 container..
What are the Dangers of Method Swizzling in Objective C? http://stackoverflow.com/questions/5339276/what-are-the-dangers-of-method-swizzling-in-objective-c order of swizzles matters The order in which methods get swizzled matters. Assuming setFrame is only defined on NSView imagine this order of things NSButton swizzle @selector setFrame with @selector my_buttonSetFrame NSControl swizzle @selector setFrame..
Can you use cancel/isCancelled with GCD/dispatch_async? http://stackoverflow.com/questions/5449469/can-you-use-cancel-iscancelled-with-gcd-dispatch-async is used. If there are any retained objects local to that method they must be cleaned up before returning. For example imagine this very reasonable modification to your buildGuts method void buildGuts we are actually in the BG here... NSDateFormatter..
How to distribute ios application wirelessly without managing UDIDs and recompilation http://stackoverflow.com/questions/5546581/how-to-distribute-ios-application-wirelessly-without-managing-udids-and-recompil internal business use. This may work with a normal developer license but you'd have to do some testing to make sure. I imagine the process is the same if it does work. I'm using XCode 4 so this may be slightly different if you're using a different.. the .ipa file. Viola they are running your program. Let me know if this works without the enterprise subscription. I imagine it would as long as the .mobileprovision file contained the device ID's. Edit I've found a much better way of distributing..
iPhone - when is dealloc for a viewcontroller called? http://stackoverflow.com/questions/577635/iphone-when-is-dealloc-for-a-viewcontroller-called and viewcontroller2. iphone share improve this question It is a case of last on first off. So if you imagine your first view controller is the bottom bun of a burger you then add the burger second view controller and then the top..
Programatically Dial a Phone number and pass DTMF using the iPhone SDK http://stackoverflow.com/questions/584663/programatically-dial-a-phone-number-and-pass-dtmf-using-the-iphone-sdk being sent. iphone share improve this question The iPhone SDK does NOT give you direct access to dial numbers imagine if a 'bad' program got on your phone and dialed a pay per minute number on mute so you didn't notice . However if you use..
Moving a Stick figure, anchorpoints, animation, or something else…? http://stackoverflow.com/questions/7808981/moving-a-stick-figure-anchorpoints-animation-or-something-else two things change the position to screen width 2 screen height 2 change the anchorPoint to 0 0 aka CGPointZero You can imagine the latter is easier to do. If you'll never move the background it's fine doing that. However for a scrolling background..
iPhone Core Animation - Drawing a Circle http://stackoverflow.com/questions/7991086/iphone-core-animation-drawing-a-circle Core Animation Drawing a Circle I wish to create an animation. The best way I can explain this is if you can imagine drawing a circle. It starts at the top or 12 o clock and draws clockwise all the way around until it becomes a complete..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud 4 . By contrast imageWithContentsOfFile will decompress that image everytime the image data is needed. As you can imagine if you only need the image data once you've won nothing here except to have a cached version of the image hanging around..
UIScrollView with “Circular” scrolling http://stackoverflow.com/questions/10448081/uiscrollview-with-circular-scrolling UIScrollViewDelegate check if the user reach any of the ends and move the offset without animation to the other end. Imagine the indicates the view being shown E A B C D E A User swipes right E A B C D E A User swipes right E A B C D E A Then automatically..
How to programmatically send SMS on the iPhone? http://stackoverflow.com/questions/10848/how-to-programmatically-send-sms-on-the-iphone get 3 200 RB points Apple has restrictions for automated or even partially automated SMS and dialing operations. Imagine if the game instead dialed 911 at a particular time of day Your best bet is to setup an intermediate server on the internet..
Send mail without MFMailComposeViewController http://stackoverflow.com/questions/1263412/send-mail-without-mfmailcomposeviewcontroller Because it's easy to abuse. If we knew user's email address we could spam them we could fake emails from them etc. Imagine finding out an iPhone app sent an email as you without your knowledge not cool even if the app had good intentions. So anything..
How to calculate the size of a UIFont when text in label is constrained down to fit width? http://stackoverflow.com/questions/1385338/how-to-calculate-the-size-of-a-uifont-when-text-in-label-is-constrained-down-to to calculate the size of a UIFont when text in label is constrained down to fit width Imagine a UILabel which is 200 pixels wide and 50 pixels high. The label has text inside and the label makes the text smaller so..
How do I translate parabolically? http://stackoverflow.com/questions/1886158/how-do-i-translate-parabolically some simple animation. I have a view I want to translate but not along a line. I want to translate it parabolically. Imagine that I am animating a car moving along a curved road. I know I can set the transform properly to an instance of CGAffineTransform..
http://stackoverflow.com/questions/2110009/iphone-audio-analysis question Look in the Audio Queue framework . This is what I use to get a high water mark AudioQueueRef audioQueue Imagine this is correctly set up UInt32 dataSize sizeof AudioQueueLevelMeterState recordFormat.mChannelsPerFrame AudioQueueLevelMeterState..
UITableView flexible/dynamic heightForRowAtIndexPath http://stackoverflow.com/questions/2213024/uitableview-flexible-dynamic-heightforrowatindexpath size dynamically it needs to know how the elements in the cell will be presented. I will make this clear in an example Imagine a UITableViewCell which contains a label named textLabel . Within the cellForRowAtIndexPath delegate method we place textLabel.numberOfLines..
Get users number from iPhone using HTML5/jQuery http://stackoverflow.com/questions/2738243/get-users-number-from-iphone-using-html5-jquery iphone mobile html5 web applications share improve this question I am pretty sure that this is not possible. Imagine the security privacy breach it would represent if any site could just retrieve the phone number of each visitor. If you..
A html5 web app for mobile safari to upload images from the Photos.app? http://stackoverflow.com/questions/3891831/a-html5-web-app-for-mobile-safari-to-upload-images-from-the-photos-app designed for the iOS devices iPad iPhone iPod Touch which can allow the user to upload an image from the filesystem Imagine uploading a new photo to your twitter avatar via a web app. iphone html5 file upload ios mobile safari share improve..
Find a point, a given distance, along a simple cubic bezier curve. (On an iPhone!) http://stackoverflow.com/questions/4058979/find-a-point-a-given-distance-along-a-simple-cubic-bezier-curve-on-an-iphone a point a given distance along a simple cubic bezier curve. On an iPhone Imagine you have a completely normal four point bezier curve two points and two control points created using curveToPoint controlPoint1..
C/C++/Obj-C Real-time algorithm to ascertain Note (not Pitch) from Vocal Input http://stackoverflow.com/questions/4062099/c-c-obj-c-real-time-algorithm-to-ascertain-note-not-pitch-from-vocal-input pitch but the pitch class of a sung note. So whether it is C4 or C5 is not important they must both be detected as C. Imagine the 12 semitones arranged on a clock face with the needle pointing to the pitch class. That's what I'm after ideally I would..
Mysterious “progressive slowing” problem in run loop / drawRect http://stackoverflow.com/questions/4786754/mysterious-progressive-slowing-problem-in-run-loop-drawrect &ldquo progressive slowing&rdquo problem in run loop drawRect Here's a real mystery. Imagine you are doing the conventional process of drawing a complex image offscreen CGLayer and you are updating the image on to..
http://stackoverflow.com/questions/4862707/floodfill-in-iphone pixels that are the same colour as the one we started with it will call another flood fill starting from that pixel. Imagine a small picture where . is one colour and X is another colour. The numbers are just there for reference so 7 0 is the top..
http://stackoverflow.com/questions/4963684/to-turn-upside-down-control turn upside down control Imagine that control a is under control b how to change it to state that control b is under control a from code xcode ios4 iphone..
Difference between self.instanceVar = X and instanceVar = X in Obj-c http://stackoverflow.com/questions/5484945/difference-between-self-instancevar-x-and-instancevar-x-in-obj-c sets the instanceVar and doesn't go through the setter Thanks iphone objective c share improve this question Imagine the following @property retain NSString myprop If you set it by self.myprop the NSString instance will be retained. If you..
iPhone - in-App purchase consumable correct approach http://stackoverflow.com/questions/6449312/iphone-in-app-purchase-consumable-correct-approach button to restore old transactions in case of the user for some reason loses his device and has to restore everything. Imagine the user has already used that purchase and after that he restores the old in app purchases. What happens then Will the..
iOS Draw Rectagle with curved ends http://stackoverflow.com/questions/6553804/ios-draw-rectagle-with-curved-ends Draw Rectagle with curved ends Imagine a long rectangle maybe with size 200x20 . All sides have straight edges. In my iOS app this is easy for me to draw CGContextFillRect..
CoreAudio AudioTimeStamp.mHostTime clock frequency? http://stackoverflow.com/questions/675626/coreaudio-audiotimestamp-mhosttime-clock-frequency find a function named mach_absolute_time . mach_absolute_time returns an uint64 number that has no defined meaning. Imagine those are ticks but nowhere is defined how long a single tick is. Only four things are defined mach_absolute_time returns..
UIDatePicker inside UIScrollView with pages http://stackoverflow.com/questions/935521/uidatepicker-inside-uiscrollview-with-pages control to respond to that intent. Determining Intent I think it's important to be clear about what the user intends. Imagine this scenario The user starts touching the screen and moves his finger far to the left but also up a little. The user probably..
iOS5 NSManagedObjectContext Concurrency types and how are they used? http://stackoverflow.com/questions/9657760/ios5-nsmanagedobjectcontext-concurrency-types-and-how-are-they-used tasks that need to be interwoven with processing that context's objects. The real fun comes when you combine them. Imagine having a parent context that does all io on a background thread that is a private queue context and then you do all your..
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