2014/10/15 下午 10:07:10
iphone Programming Glossary: divideHow do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an interval that spans years and I want all the time components from year down to seconds. My first thought is to integer divide the time interval by seconds in a year subtract that from a running total of seconds divide that by seconds in a month subtract.. thought is to integer divide the time interval by seconds in a year subtract that from a running total of seconds divide that by seconds in a month subtract that from the running total and so on. That just seems convoluted and I've read that..
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 struct RGBAPixel byte red byte green byte blue byte alpha RGBAPixel Bitmap function returns pre calculated RGBA divide RGB by A to get unmodified RGB RGBAPixel bitmap NSLog @ Returning bitmap representation of UIImage. 8 bits each of red green.. Cast a pointer to the first element of pixelByteData Essentially what we're doing is making a second pointer that divides the byteData's units differently instead of dividing each unit as 1 byte we will divide each unit as 3 bytes 1 pixel ... making a second pointer that divides the byteData's units differently instead of dividing each unit as 1 byte we will divide each unit as 3 bytes 1 pixel . pixelData RGBPixel pixelByteData Now you can access pixels by index pixelData index NSLog..
What is mach_absolute_time based on on iPhone http://stackoverflow.com/questions/1450737/what-is-mach-absolute-time-based-on-on-iphone if s_timebase_info.denom 0 void mach_timebase_info s_timebase_info mach_absolute_time returns billionth of seconds so divide by one million to get milliseconds return int mach_absolute_time s_timebase_info.numer kOneMillion s_timebase_info.denom..
How to encrypt an NSString in Objective C with DES in ECB-Mode? http://stackoverflow.com/questions/2512184/how-to-encrypt-an-nsstring-in-objective-c-with-des-in-ecb-mode ECB mode uses an 8 byte block size and encodes each blocks individually. The problem is that your input string doesn't divide into 8 bytes equally and the cryptor doesn't know what to do with the final non 8 byte block. The fix is to allow the cryptor..
iPhone OpenGL ES - How to Pick http://stackoverflow.com/questions/2540447/iphone-opengl-es-how-to-pick p 13 p 2 _point3D.x p 6 _point3D.y p 10 _point3D.z p 14 p 3 _point3D.x p 7 _point3D.y p 11 _point3D.z p 15 divide by scale factor IMPoint2D _p2D _p 0 _p 3 _p 1 _p 3 get result in screen coordinates. In this case I'm in landscape mode..
streaming video FROM an iPhone http://stackoverflow.com/questions/3444791/streaming-video-from-an-iphone to compile properly in an iPhone app. iphone video streaming video encoding share improve this question You could divide your recording to separate files with a length of say 10sec then send them separately. If you use AVCaptureSession 's beginConfiguration..
http://stackoverflow.com/questions/3841642/curve-text-on-existing-circle even spacing you could even work out the ratio between the total length of all strings and the whole perimeter. And divide the remaining space equally between the string. Update I made a proof of concept using html5 canvas so view it with a decent..
Drawing app on iPad using OpenGL http://stackoverflow.com/questions/4606680/drawing-app-on-ipad-using-opengl I don't have any code for it but here is a primer for component mathmatics from a physics site. Or you can simply divide above count by some number to find out how thick you need the line to be count uses component mathematics . I store point..
Number of days between two NSDates http://stackoverflow.com/questions/4739483/number-of-days-between-two-nsdates
how to crop image in to pieces programmatically http://stackoverflow.com/questions/4743242/how-to-crop-image-in-to-pieces-programmatically to crop image in to pieces programmatically I need to divide an image into 9 pieces programmatically. Any suggestions on how to do this iphone core graphics share improve this question..
http://stackoverflow.com/questions/4894923/augmented-reality-movement the same city or closer you can disregard the altitude and the arc of the earth. To move the object around you need to divide the number of pixels of the screen between the degrees of the field view to get pixels per degree and multiply that by the..
Download music file from server and save in my app http://stackoverflow.com/questions/5620849/download-music-file-from-server-and-save-in-my-app then in each call to the NSURLConnection didRecieveData method you count the incoming bytes using data length method divide it by the expectedContentLength from the previous URL response and that's the float the represents your progress that you..
Using [UIColor colorWithRed: green: blue: alpha:] does't work with UITableView seperatorColor? http://stackoverflow.com/questions/5641523/using-uicolor-colorwithred-green-blue-alpha-doest-work-with-uitableview-s seperators just fine. What's the deal iphone cocoa touch uitableview ios4 share improve this question You need to divide by 255.0 Because I hardly ever use values between 1.0 and 0.0 I created a very simple UIColor category that does the messy..
Calculate new coordinate x meters and y degree away from one coordinate http://stackoverflow.com/questions/6633850/calculate-new-coordinate-x-meters-and-y-degree-away-from-one-coordinate
Is programmatically inverting the colors of an image possible? http://stackoverflow.com/questions/6672517/is-programmatically-inverting-the-colors-of-an-image-possible pixels one by one... for int x 0 x width x get RGB values. We're dealing with premultiplied alpha here so we need to divide by the alpha channel if it isn't zero of course to get uninflected RGB. We multiply by 255 to keep precision while still.. 2 255 linePointer 3 else r g b 0 perform the colour inversion r 255 r g 255 g b 255 b multiply by alpha again divide by 255 to undo the scaling before store the new values and advance the pointer we're reading pixel data from linePointer..
Using UIPinchGestureRecognizer to scale uiviews in single direction http://stackoverflow.com/questions/6759028/using-uipinchgesturerecognizer-to-scale-uiviews-in-single-direction zero when the displacement is equal along the two axis the scale delta is also equal along the two axis I decided to divide by the distance but there are other possibilities like dividing by the sum of the two deltaMoves or by the max of the deltaMoves..
http://stackoverflow.com/questions/11173605/detecting-a-clap-in-ios slam Given an audio stream find when a door slams sound pressure level calculation It seems that I need to do this Divide the samples up into sections Calculate the energy of each section Take the ratio of the energies between the previous window..
http://stackoverflow.com/questions/11773974/xcode-duplicate-symbol-error iphone objective c ios xcode share improve this question C C Objective C diff with Java C# Ruby Python... Divide files. header mm Do not use #include may include many times Use #import... include once Utils.h #ifndef __utils_h__ avoid..
How to implement Blowfish algorithm in iOS http://stackoverflow.com/questions/13507384/how-to-implement-blowfish-algorithm-in-ios aLeftRange aRightRange NSData aLeftBox aRightBox unsigned long dl 0 dr 0 for int i 0 i dataToEncrypt length i 8 Divide data into octets... 地nd then into quartets aLeftRange NSMakeRange i 4 aRightRange NSMakeRange i 4 4 aLeftBox dataToEncrypt.. aLeftRange aRightRange NSData aLeftBox aRightBox unsigned long dl 0 dr 0 for int i 0 i decryptedData length i 8 Divide data into octets... 地nd then into quartets aLeftRange NSMakeRange i 4 aRightRange NSMakeRange i 4 4 aLeftBox decryptedData..
Resize UIImage with aspect ratio? http://stackoverflow.com/questions/1703100/resize-uiimage-with-aspect-ratio screenRect.size.width float vfactor value.bounds.size.height screenRect.size.height float factor fmax hfactor vfactor Divide the size by the greater of the vertical or horizontal shrinkage factor float newWidth value.bounds.size.width factor float..
Skipping the 'CompressResources' build step for XCode iPhone apps http://stackoverflow.com/questions/177160/skipping-the-compressresources-build-step-for-xcode-iphone-apps the CgBI chunk Skip the zlib headers Swap BGR to RGB channel order Edit It appears it also premultiplies the alpha so Divide by alpha iphone xcode image resources share improve this question You can add IPHONE_OPTIMIZE_OPTIONS skip PNGs to..
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