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2014/10/15 ¤U¤È 10:05:24
iphone Programming Glossary: computeresize uitableviewcell to the label's height dynamically? http://stackoverflow.com/questions/1012361/resize-uitableviewcell-to-the-labels-height-dynamically NSIndexPath passed to it to get the text at a specific row and use the sizeWithFont method from UIStringDrawing.h to compute a CGSize for that row. For example CGSize size text sizeWithFont font constrainedToSize maximumLabelSize lineBreakMode..
Trouble with CLLocation method distanceFromLocation: Inaccurate results http://stackoverflow.com/questions/10184802/trouble-with-cllocation-method-distancefromlocation-inaccurate-results Set a minimum distance filter preferably at least 10 meters to filter out position noise. EDIT Don't compute distance when the oldLocation is nil. There's more you could do but this should work provided you get a good enough horizonalAccuracy.. updates if newLocation.horizontalAccuracy 0 return ignore invalid udpates EDIT need a valid oldLocation to be able to compute distance if oldLocation nil oldLocation.horizontalAccuracy 0 return CLLocationDistance distance newLocation distanceFromLocation.. updates if newLocation.horizontalAccuracy 0 return ignore invalid udpates EDIT need a valid oldLocation to be able to compute distance if self.oldLocation nil self.oldLocation.horizontalAccuracy 0 self.oldLocation newLocation return CLLocationDistance..
Compute a checksum on the iPhone from NSData http://stackoverflow.com/questions/1028742/compute-a-checksum-on-the-iphone-from-nsdata see that a file with that name already exists hurrah However I've scoured the internet and the Apple docs for how to compute a checksum from a NSData. I know I could implement my own implementation but I'd prefer to avoid that if possible. I'm also.. improve this question In the CommonCrypto CommonDigest.h header file there should be a CC_MD5 function that will compute an MD5 hash of arbitrary data. It's a C function so it won't work directly on an NSData but it should do what you need...
Drag UIView around Shape Comprised of CGMutablePaths http://stackoverflow.com/questions/13664615/drag-uiview-around-shape-comprised-of-cgmutablepaths addGestureRecognizer recognizer At view layout time we need to create the path based on the size of the view compute the points along the path make the path layer show the path and make sure the handle is on the path void viewDidLayoutSubviews.. radius radius startAngle M_PI_4 endAngle M_PI M_PI_4 clockwise YES path_ closePath Next we're going to want to compute the array of points along that path. We'll need a helper routine to pick out the endpoint of each path element static CGPoint.. distance from the handle to a point should the handle be moved along the path by some offset. Your old buddy hypotf computes the Euclidean distance so you don't have to CGFloat distanceToPoint CGPoint point ifHandleMovesByOffset NSInteger offset..
Using custom sections with NSFetchedResultsController? http://stackoverflow.com/questions/1384345/using-custom-sections-with-nsfetchedresultscontroller well explained in the documentation most notably you can not modify relationships or pass arguments however if you can compute you transient property using only the values of the other properties relationships it should be perfectly fine . Once you..
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew the vector x y z w 1 will be converted to the actual 3D vector x w y w z w before projection if CA follows usual 3D compute graphics rules so you could cheat by using the transform P . . Q x x' . R . S y y' . . 1 . z z' . T . U 1 w' with appropriate.. X Y W H to any quadrilateral x1a y1a x2a y2a x3a y3a x4a y4a use this function you may need a transpose function compute_transform_matrix X Y W H x1a y1a x2a y2a x3a y3a x4a y4a var y21 y2a y1a y32 y3a y2a y43 y4a y3a y14 y1a y4a y31 y3a y1a..
http://stackoverflow.com/questions/3352822/drawing-on-iphone vector gestures share improve this question Using GLGestureRecognizer you can create a catalogue and it will compute a metric between an input point array against an alphabet you predefine. GLGestureRecognizer is an Objective C implementation..
How to draw a color wheel in objective-c http://stackoverflow.com/questions/5108921/how-to-draw-a-color-wheel-in-objective-c the luminance value for each which results in gray. if s 0.0 outR l outG l outB l return Test for luminance and compute temporary values based on luminance and saturation if l 0.5 temp2 l 1.0 s else temp2 l s l s temp1 2.0 l temp2 Compute intermediate..
Store orientation to an array - and compare http://stackoverflow.com/questions/6368618/store-orientation-to-an-array-and-compare similar to the newly measured Obviously the second array is similar to the newly measured and the first is not. Let's compute the cost matrices according to this paper subsection 2.1 D i j Dist i j MIN D i 1 j D i j 1 D i 1 j 1 Here D i j is the.. cost matrix see below. Check Figure 3 of that paper to see this recurrence relation is applied. In short columns are computed first starting from D 1 1 D 0 and D 0 are left out in the MIN. If we are comparing arrays A and B then Dist i j is the.. are using acceleration data you have 3 dimensional vectors at each time point the x y z coordinates. I would simply compute Dist i j SQRT A i X B j X ^2 A i Y B j Y ^2 A i Z B j Z ^2 that is the Eucledian distance between the two points. share..
Help calculating X and Y from Latitude and Longitude in iPhone http://stackoverflow.com/questions/6852195/help-calculating-x-and-y-from-latitude-and-longitude-in-iphone distance i.e. distance in pixel space and angle is the angle between vector 1 and 2 above As a sanity check you could compute the angle of the lat lon vectors created from the top left to bottom left dotted with the bottom right to bottom left. If..
GPS coordinates in degrees to calculate distances http://stackoverflow.com/questions/6994101/gps-coordinates-in-degrees-to-calculate-distances in degrees. I would like to have the result in meters. What's the conversion needed How will the final formula to compute this look like iphone ios4 map gps share improve this question Why don't you use CLLocation s distanceFromLocation..
http://stackoverflow.com/questions/7989864/watching-memory-usage-in-ios host_port HOST_VM_INFO host_info_t vm_stat host_size return vm_stat.free_count pagesize void logMemUsage void compute memory usage and log if different by 100k static long prevMemUsage 0 long curMemUsage usedMemory long memUsageDiff curMemUsage..
iOS Pinch Scale and Two Finger Rotate at same time http://stackoverflow.com/questions/8108768/ios-pinch-scale-and-two-finger-rotate-at-same-time iphone ios objective c ipad cocoa touch share improve this question Every time pinch is called you just compute the transform based on the pinch recognizer's scale. Every time pinchRotate is called you just compute the transform based.. called you just compute the transform based on the pinch recognizer's scale. Every time pinchRotate is called you just compute the transform based on the rotation recognizer's rotation. You never combine the scale and the rotation into one transform...
Keeping object on top of keyboard in the event of becomeFirstResponder or resignFirstResponder? http://stackoverflow.com/questions/8704137/keeping-object-on-top-of-keyboard-in-the-event-of-becomefirstresponder-or-resign CGRect keyboardFrameForTextField self.myTextField.superview convertRect keyboardFrame fromView nil Next I compute the frame that I want myTextField to move to. The bottom edge of the new frame should be equal to the top edge of the keyboard's..
Compute a checksum on the iPhone from NSData http://stackoverflow.com/questions/1028742/compute-a-checksum-on-the-iphone-from-nsdata a checksum on the iPhone from NSData Using the iPhone SDK I'm having the user select images from the image picker. If the..
How to measure the distance covered by iphone during free fall? http://stackoverflow.com/questions/1073608/how-to-measure-the-distance-covered-by-iphone-during-free-fall
Fastest cross-platform A* implementation? http://stackoverflow.com/questions/2107601/fastest-cross-platform-a-implementation INode n open.remove closed.insert n Return if goal state reached. if n.equals goal return new Solution initial n Compute successor moves and update OPEN CLOSED lists. DepthTransition trans DepthTransition n.storedData int depth 1 if trans null..
How to draw a color wheel in objective-c http://stackoverflow.com/questions/5108921/how-to-draw-a-color-wheel-in-objective-c compute temporary values based on luminance and saturation if l 0.5 temp2 l 1.0 s else temp2 l s l s temp1 2.0 l temp2 Compute intermediate values based on hue temp 0 h 1.0 3.0 temp 1 h temp 2 h 1.0 3.0 for i 0 i 3 i Adjust the range if temp i 0.0..
Help calculating X and Y from Latitude and Longitude in iPhone http://stackoverflow.com/questions/6852195/help-calculating-x-and-y-from-latitude-and-longitude-in-iphone a coordinate system say bottom left corner with known lat lon at 0 0 pixels. Called lat1 lon2 in following pseudo code Compute vector 1 from the bottom right lat2 lon2 to the bottom left lat1 lon1 Using simple projection xl lon yl lat then vector.. lat2 lon2 to the bottom left lat1 lon1 Using simple projection xl lon yl lat then vector 1 lon2 lon1 i lat2 lat1 j Compute vector 2 from the lat lon position of person you want latp lonp to put on the map to the bottom left point lat1 lon1 Use.. to put on the map to the bottom left point lat1 lon1 Use vector dot product to get the angle between vector 1 and 2. Compute the distance in lat lon space via equirectangular projection p1 lonp lon1 cos 0.5 latp lat1 convert lat lon to radians p2..
Executable encryption check anti piracy measure http://stackoverflow.com/questions/7038143/executable-encryption-check-anti-piracy-measure main dlinfo 0 dlinfo.dli_fbase NULL NSLog @ Could not find main symbol very odd return NO header dlinfo.dli_fbase Compute the image size and search for a UUID struct load_command cmd struct load_command header 1 for uint32_t i 0 cmd NULL i header..
Rotate a Sprite on a bezier path with touch - Cocos2D/Box2D http://stackoverflow.com/questions/7494795/rotate-a-sprite-on-a-bezier-path-with-touch-cocos2d-box2d startAngle_ float endAngle endAngle_ float startAngle fmodf startAngle_ twoPI float endAngle fmodf endAngle_ twoPI Compute the sequence of arc curves up to PI 2 at a time. Total arc angle is less than 2PI. NSMutableArray curves NSMutableArray.. and x2 y2 and x3 y3 are the cubic bezier's control points. NSArray createSmallArc float r a1 float a1 a2 float a2 Compute all four points for an arc that subtends the same total angle but is centered on the X axis float a a2 a1 2.0 float x4 r..
canonical way to randomize an NSArray in Objective C http://stackoverflow.com/questions/791232/canonical-way-to-randomize-an-nsarray-in-objective-c to do it @interface NSMutableArray ArchUtils_Shuffle void shuffle @end Chooses a random integer below n without bias. Computes m a power of two slightly above n and takes random modulo m then throws away the random number if it's between n and m... n introduce a bias towards smaller numbers in the range. static NSUInteger random_below NSUInteger n NSUInteger m 1 Compute smallest power of two greater than n. There's probably a faster solution than this loop but bit twiddling isn't my specialty...
Save OpenGL Drawn item as a Image http://stackoverflow.com/questions/9660723/save-opengl-drawn-item-as-a-image UIImage imageNamed @ Green.png UIImage imageNamed @ Blue.png UIImage imageNamed @ Purple.png nil Compute a rectangle that is positioned correctly for the segmented control you'll use as a brush color palette CGRect frame CGRectMake..
Record the drawing as a m4v video file - OpenGL http://stackoverflow.com/questions/9661259/record-the-drawing-as-a-m4v-video-file-opengl UIImage imageNamed @ Green.png UIImage imageNamed @ Blue.png UIImage imageNamed @ Purple.png nil Compute a rectangle that is positioned correctly for the segmented control you'll use as a brush color palette CGRect frame CGRectMake..
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