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2014/10/15 ¤U¤È 10:04:51
iphone Programming Glossary: calculateRetrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex..
iOS crash reports: atos not working as expected http://stackoverflow.com/questions/13574933/ios-crash-reports-atos-not-working-as-expected iphone ios crash reports symbolicatecrash symbolicate share improve this question You have to calculate the address to use with atos you can't just use the one in the stacktrace. symbol address slide stack..
http://stackoverflow.com/questions/1524604/md5-algorithm-in-objective-c algorithm in Objective C How to calculate the MD5 in objective C iphone objective c encryption md5 share improve this question md5 is available..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework samples is ie 1 44 s. So we would pack A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate some bobbins setupReal and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2.. A.realp float malloc nOver2 sizeof float A.imagp float malloc nOver2 sizeof float Next it pre calculates everything that can be precalculated. note that if you are doing this in real code you probably want.. float A.imagp float malloc nOver2 sizeof float Next it pre calculates everything that can be precalculated. note that if you are doing this in real code you probably want to do this once when the app loads..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file for more Objective C style. This also seems like a ridiculous way to write to a PDF file having to calculate where lines and other objects will be placed. void CreatePDFFile CGRect pageRect const char filename..
iPhone smooth sketch drawing algorithm http://stackoverflow.com/questions/5076622/iphone-smooth-sketch-drawing-algorithm For the math behind this see this article pointed to in this answer which describes how to calculate the curves required to smooth a curve that passes through multiple points. I believe that the Core Plot..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload is already correct if self.imageOrientation UIImageOrientationUp return self We need to calculate the proper transformation to make the image upright. We do it in 2 steps Rotate if Left Right Down and.. break Now we draw the underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent..
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating what I'm trying to do. Basicly user presses a button that button is ENABLED NO Function called to calculate puzzle. While it's calculating keep the UI Labels updated with moves solution data. Then once it's finished..
How can I get a precise time, for example in milliseconds in Objective-C? http://stackoverflow.com/questions/889380/how-can-i-get-a-precise-time-for-example-in-milliseconds-in-objective-c in milliseconds in Objective C Is there an easy way to get a time very precisely I need to calculate some delays between method calls. More specifically I want to calculate the speed of scrolling in an.. very precisely I need to calculate some delays between method calls. More specifically I want to calculate the speed of scrolling in an UIScrollView. iphone objective c cocoa touch uikit share improve this.. NSTimeInterval is in seconds but it uses the double to give you greater precision. In order to calculate millisecond time accuracy you can do Get a current time for where you want to start measuring from NSDate..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x bytesPerPixel unsigned..
iOS crash reports: atos not working as expected http://stackoverflow.com/questions/13574933/ios-crash-reports-atos-not-working-as-expected else experienced this issue Can you please advise Thanks. iphone ios crash reports symbolicatecrash symbolicate share improve this question You have to calculate the address to use with atos you can't just use the one in the stacktrace. symbol address slide stack address load address The slide value is the value of vmaddr..
http://stackoverflow.com/questions/1524604/md5-algorithm-in-objective-c algorithm in Objective C How to calculate the MD5 in objective C iphone objective c encryption md5 share improve this question md5 is available on the iPhone and can be added as an extension for ie..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework sec. So our time window is whatever the time duration of 1024 samples is ie 1 44 s. So we would pack A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate some bobbins setupReal and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2 complex numbers. These represent n 2 frequency bins bin 1 .idealFreq.. to get this maybe look up COMPLEX_SPLIT in the documentation. A.realp float malloc nOver2 sizeof float A.imagp float malloc nOver2 sizeof float Next it pre calculates everything that can be precalculated. note that if you are doing this in real code you probably want to do this once when the app loads and call the complimentary.. in the documentation. A.realp float malloc nOver2 sizeof float A.imagp float malloc nOver2 sizeof float Next it pre calculates everything that can be precalculated. note that if you are doing this in real code you probably want to do this once when the app loads and call the complimentary release function once when it quits...
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file Creation Tutorial but it was mostly written in C. Looking for more Objective C style. This also seems like a ridiculous way to write to a PDF file having to calculate where lines and other objects will be placed. void CreatePDFFile CGRect pageRect const char filename This code block sets up our PDF Context so that we can draw..
iPhone smooth sketch drawing algorithm http://stackoverflow.com/questions/5076622/iphone-smooth-sketch-drawing-algorithm this is to use a Bezier curve instead of straight line segments. For the math behind this see this article pointed to in this answer which describes how to calculate the curves required to smooth a curve that passes through multiple points. I believe that the Core Plot framework now has the ability to smooth the curves of plots..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload UIImage fixOrientation UIImage fixOrientation No op if the orientation is already correct if self.imageOrientation UIImageOrientationUp return self We need to calculate the proper transformation to make the image upright. We do it in 2 steps Rotate if Left Right Down and then flip if Mirrored. CGAffineTransform transform CGAffineTransformIdentity.. case UIImageOrientationLeft case UIImageOrientationRight break Now we draw the underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent self.CGImage 0 CGImageGetColorSpace self.CGImage..
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating missing or some other typos.. but it should give you an idea what I'm trying to do. Basicly user presses a button that button is ENABLED NO Function called to calculate puzzle. While it's calculating keep the UI Labels updated with moves solution data. Then once it's finished calculating the puzzle Button is ENABLED YES Called..
How can I get a precise time, for example in milliseconds in Objective-C? http://stackoverflow.com/questions/889380/how-can-i-get-a-precise-time-for-example-in-milliseconds-in-objective-c can I get a precise time for example in milliseconds in Objective C Is there an easy way to get a time very precisely I need to calculate some delays between method calls. More specifically I want to calculate the speed of scrolling in an UIScrollView. iphone objective c cocoa touch uikit share.. in Objective C Is there an easy way to get a time very precisely I need to calculate some delays between method calls. More specifically I want to calculate the speed of scrolling in an UIScrollView. iphone objective c cocoa touch uikit share improve this question NSDate and the timeIntervalSince methods will return.. NSTimeInterval which is a double with sub millisecond accuracy. NSTimeInterval is in seconds but it uses the double to give you greater precision. In order to calculate millisecond time accuracy you can do Get a current time for where you want to start measuring from NSDate date NSDate date do work... Find elapsed time and convert..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y..
iOS crash reports: atos not working as expected http://stackoverflow.com/questions/13574933/ios-crash-reports-atos-not-working-as-expected advise Thanks. iphone ios crash reports symbolicatecrash symbolicate share improve this question You have to calculate the address to use with atos you can't just use the one in the stacktrace. symbol address slide stack address load address..
iphone: Calculating battery life http://stackoverflow.com/questions/1469549/iphone-calculating-battery-life Seems to me that if all you're given is change notifications at 5 changes up or down accuracy is not something you can calculate very well or quickly. A 5 change could take a very long time if the device isn't doing anything. Maybe you can monitor UIDevice..
http://stackoverflow.com/questions/1524604/md5-algorithm-in-objective-c algorithm in Objective C How to calculate the MD5 in objective C iphone objective c encryption md5 share improve this question md5 is available on the iPhone..
How do you calculate the day of the year for a specific date in Objective C http://stackoverflow.com/questions/2080927/how-do-you-calculate-the-day-of-the-year-for-a-specific-date-in-objective-c do you calculate the day of the year for a specific date in Objective C This is something I found myself spending hours to figure out and..
Calculate the size of a folder http://stackoverflow.com/questions/2188469/calculate-the-size-of-a-folder able to keep the size of this folder down to 1MB so I need to to check the size in bytes of my folder. I have code to calculate the size of file but I need the size of the folder. What would be the best way to do this Will I need to loop through each..
Re-Apply currency formatting to a UITextField on a change event http://stackoverflow.com/questions/2388448/re-apply-currency-formatting-to-a-uitextfield-on-a-change-event whenever a decimalSeperator is entered we'll just update the textField. whenever other chars are entered we'll calculate the new number and update the textField accordingly. if string isEqualToString decimalSeperator YES textField.text text..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework time duration of 1024 samples is ie 1 44 s. So we would pack A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate some bobbins setupReal and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2 complex numbers. These.. in the documentation. A.realp float malloc nOver2 sizeof float A.imagp float malloc nOver2 sizeof float Next it pre calculates everything that can be precalculated. note that if you are doing this in real code you probably want to do this once when.. malloc nOver2 sizeof float A.imagp float malloc nOver2 sizeof float Next it pre calculates everything that can be precalculated. note that if you are doing this in real code you probably want to do this once when the app loads and call the complimentary..
http://stackoverflow.com/questions/4097044/pdf-search-on-the-iphone let me know . But then how to highlight the result I know there are a few operators to find the glyph sizes so I could calculate the resulting rect based on those values but I've been reading the spec for hours... it's a bloated mess and I'm going insane...
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file in C. Looking for more Objective C style. This also seems like a ridiculous way to write to a PDF file having to calculate where lines and other objects will be placed. void CreatePDFFile CGRect pageRect const char filename This code block sets..
iPhone smooth sketch drawing algorithm http://stackoverflow.com/questions/5076622/iphone-smooth-sketch-drawing-algorithm of straight line segments. For the math behind this see this article pointed to in this answer which describes how to calculate the curves required to smooth a curve that passes through multiple points. I believe that the Core Plot framework now has..
UITextView ruled line background but wrong line height http://stackoverflow.com/questions/5375350/uitextview-ruled-line-background-but-wrong-line-height self.bounds.size.height self.font.leading Set the line offset from the baseline. I'm sure there's a concrete way to calculate this. CGFloat baselineOffset 6.0f iterate over numberOfLines and draw each line for int x 0 x numberOfLines x 0.5f offset..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload No op if the orientation is already correct if self.imageOrientation UIImageOrientationUp return self We need to calculate the proper transformation to make the image upright. We do it in 2 steps Rotate if Left Right Down and then flip if Mirrored... case UIImageOrientationRight break Now we draw the underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent self.CGImage..
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 code. Specifically the section titled Destination point given distance and bearing from start point shows how to calculate what you're asking. The JavaScript code is at the bottom of that page and here's one possible way to convert it to Objective..
Distance moved by Accelerometer http://stackoverflow.com/questions/6645126/distance-moved-by-accelerometer of iphone with no GPS What is the real world accuracy of phone accelerometers when used for positioning how to calculate phone's movement in the vertical direction from rest iOS Movement Precision in 3D Space How to use Accelerometer to measure..
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating give you an idea what I'm trying to do. Basicly user presses a button that button is ENABLED NO Function called to calculate puzzle. While it's calculating keep the UI Labels updated with moves solution data. Then once it's finished calculating..
How can I get a precise time, for example in milliseconds in Objective-C? http://stackoverflow.com/questions/889380/how-can-i-get-a-precise-time-for-example-in-milliseconds-in-objective-c a precise time for example in milliseconds in Objective C Is there an easy way to get a time very precisely I need to calculate some delays between method calls. More specifically I want to calculate the speed of scrolling in an UIScrollView. iphone.. way to get a time very precisely I need to calculate some delays between method calls. More specifically I want to calculate the speed of scrolling in an UIScrollView. iphone objective c cocoa touch uikit share improve this question NSDate.. millisecond accuracy. NSTimeInterval is in seconds but it uses the double to give you greater precision. In order to calculate millisecond time accuracy you can do Get a current time for where you want to start measuring from NSDate date NSDate date..
Fuzzy Date algorithm in Objective-C http://stackoverflow.com/questions/1052951/fuzzy-date-algorithm-in-objective-c 60 MINUTE #define DAY 24 HOUR #define MONTH 30 DAY NSString timeIntervalWithStartDate NSDate d1 withEndDate NSDate d2 Calculate the delta in seconds between the two dates NSTimeInterval delta d2 timeIntervalSinceDate d1 if delta 1 MINUTE return delta..
Check if the time and date is between a particular date and time http://stackoverflow.com/questions/10671468/check-if-the-time-and-date-is-between-a-particular-date-and-time NSString endDateStringWithYear NSString stringWithFormat @ @ d endDateString currentDateComps.year Calculate NSDate's for start endDate NSDateFormatter formatter NSDateFormatter alloc init formatter setDateFormat @ EEE MM dd yyyy.. into separate words NSArray timeDurationStringWords timeDurationString componentsSeparatedByString @ Calculate NSDate's for the start time for today NSString startTimeString timeDurationStringWords objectAtIndex 0 currentDateComps.hour..
Convert to Float and Calculate http://stackoverflow.com/questions/14155360/convert-to-float-and-calculate to Float and Calculate I have a string with multiple digits and operators @ 5 4 9 10 . How to get the result from it I want to use it within the..
iPhone App floating point calculations when released to the app store. http://stackoverflow.com/questions/14210621/iphone-app-floating-point-calculations-when-released-to-the-app-store simplicity @dynamic domesticAH @dynamic voltage @dynamic profileDischarge NSNumber dischargeAmpH float totalWattsPD Calculate the watts per day so we can accurately calculate the percentage of each item line for BBDischarge currentDischarge in self.profileDischarge..
Get the password from the webservices url and access through that password http://stackoverflow.com/questions/15377212/get-the-password-from-the-webservices-url-and-access-through-that-password post dataUsingEncoding NSASCIIStringEncoding allowLossyConversion YES You need to send the actual length of your data. Calculate the length of the post string. NSString postLength NSString stringWithFormat @ d postData length 3. Create a Urlrequest..
Custom Delete button On Editing in UITableView Cell http://stackoverflow.com/questions/1615469/custom-delete-button-on-editing-in-uitableview-cell
How do I programatically zoom a UIScrollView? http://stackoverflow.com/questions/172255/how-do-i-programatically-zoom-a-uiscrollview view's frame and bounds. Mark the internal view as needing display. Tell the UIScrollView about the new content size. Calculate the portion of your internal view that should be displayed after the zoom and have the UIScrollView pan to that location...
Calculate the size of a folder http://stackoverflow.com/questions/2188469/calculate-the-size-of-a-folder the size of a folder Just a quick one... I'm creating a folder to cache images inside Documents with my iPhone App. I want..
Can I select a specific block of text in a UITextField? http://stackoverflow.com/questions/3277538/can-i-select-a-specific-block-of-text-in-a-uitextfield this example assumes is an insertion point or empty selection UITextRange selectedRange textField selectedTextRange Calculate the new position for left and for right UITextPosition newPosition textField positionFromPosition selectedRange.start offset..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 BUILD_ROOT SYMROOT SYMROOT ACTION build #Merge all platform binaries as a fat binary for each configurations. # Calculate where the multiple built files are coming from CURRENTCONFIG_DEVICE_DIR SYMROOT CONFIGURATION iphoneos CURRENTCONFIG_SIMULATOR_DIR..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints CGContextRef context is like CGAffineTransform currentCTM CGContextGetCTM context if currentCTM.a 1.0 baseImage Calculate ideal scale CGFloat scaleForWidth baseImage.size.width self.bounds.size.width CGFloat scaleForHeight baseImage.size.height..
How to display an image on a MKOverlayView? http://stackoverflow.com/questions/3891850/how-to-display-an-image-on-a-mkoverlayview width CGImageGetWidth imageReference self.scaleFactor size_t height CGImageGetHeight imageReference self.scaleFactor Calculate colorspace for the specified image CGColorSpaceRef imageColorSpace CGImageGetColorSpace imageReference Allocate and clear..
distanceFromLocation - Calculate distance between two points http://stackoverflow.com/questions/3905896/distancefromlocation-calculate-distance-between-two-points Calculate distance between two points Just a quick question on Core Location I'm trying to calculate the distance between two points..
What is -[NSString sizeWithFont:forWidth:lineBreakMode:] good for? http://stackoverflow.com/questions/455553/what-is-nsstring-sizewithfontforwidthlinebreakmode-good-for by the string that's in it. I use this method to do this. And example of how I would use it to do that is as follows Calculate the expected size based on the font and linebreak mode of your label CGSize maximumLabelSize CGSizeMake 296 9999 CGSize..
Using MD5 hash on a string in cocoa? [duplicate] http://stackoverflow.com/questions/652300/using-md5-hash-on-a-string-in-cocoa
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 new coordinate x meters and y degree away from one coordinate I must be missing somthing out in the docs I thought this..
Using UIPinchGestureRecognizer to scale uiviews in single direction http://stackoverflow.com/questions/6759028/using-uipinchgesturerecognizer-to-scale-uiviews-in-single-direction transform hScale vScale gestureRecognizer setScale 1 lastTouchPosition currentTouchLocation NSLog @ scalePiece exit Calculate distance CGPoint calculatePointDistancewithPoint1 CGPoint point1 andPoint2 CGPoint point2 return CGPointMake point2.x point1.x..
iOS Stream Audio from one iOS Device to Another http://stackoverflow.com/questions/8357514/ios-stream-audio-from-one-ios-device-to-another worth. For the final callback you will only have 1 second's worth of data left. numBytesToCopy must reflect that. Calculate how many bytes are remaining It could be less than a normal buffer size. For example if the buffer size is 0.5 seconds and..
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