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2014/10/15 ¤U¤È 10:11:20
iphone Programming Glossary: measuredWhy is my CLLocation speed so inaccurate? http://stackoverflow.com/questions/1180050/why-is-my-cllocation-speed-so-inaccurate using the GPS using an interval of at least one second. Below this interval the speed value is useless because it is measured in meters per second and owing to the previous discussion you are not likely to get a valid update in less than a second..
iOS iPhone 5 Choose Correct Storyboard http://stackoverflow.com/questions/14266776/ios-iphone-5-choose-correct-storyboard iOSDeviceScreenSize.height 480 iPhone 3GS 4 and 4S and iPod Touch 3rd and 4th generation 3.5 inch screen diagonally measured Instantiate a new storyboard object using the storyboard file named Storyboard_iPhone35 UIStoryboard iPhone35Storyboard.. makeKeyAndVisible if iOSDeviceScreenSize.height 568 iPhone 5 and iPod Touch 5th generation 4 inch screen diagonally measured Instantiate a new storyboard object using the storyboard file named Storyboard_iPhone4 UIStoryboard iPhone4Storyboard UIStoryboard..
Dim iPhone Screen, but don't let it sleep http://stackoverflow.com/questions/1961783/dim-iphone-screen-but-dont-let-it-sleep right strategy with useful but undocumented APIs is to use them and see what happens. Failing that has anybody ever measured if the phone's power consumption goes down if it's showing a black image or does it not help unless you can turn down the..
CLLocationManager and degrees of heading in iPhone http://stackoverflow.com/questions/2043685/cllocationmanager-and-degrees-of-heading-in-iphone headings degrees you can use magneticHeading and trueHeading properties instead of x and y . trueHeading The heading measured in degrees relative to true North. read only @property readonly nonatomic CLLocationDirection trueHeading Discussion The..
Large scrolling background in OpenGL ES http://stackoverflow.com/questions/217822/large-scrolling-background-in-opengl-es to some measuring code I wrote it looks like background takes 7 ms to draw on average and 84 ms at maximum. This is measured in the simulator. This is about a half of the whole render loop ie. quite slow for me. Drawing the background should be..
iPhone SDK - get/calculate camera field of view (FOV) (Augmented Reality) http://stackoverflow.com/questions/3643075/iphone-sdk-get-calculate-camera-field-of-view-fov-augmented-reality camera augmented reality fieldofview share improve this question I took a photo of a piece of paper that i had measured from a distance that i also measured. I then looked at the ratio of the size of the piece of paper to its image in the photo... share improve this question I took a photo of a piece of paper that i had measured from a distance that i also measured. I then looked at the ratio of the size of the piece of paper to its image in the photo. My values were at 56 cm you can..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events your application enters foreground again. And terminate the task if you don't need it anymore. For my own experience I measured something. Using the location callbacks with having the GPS radio on is sucking my battery down very quickly. Using the..
How can I do fast image processing from the iPhone camera? http://stackoverflow.com/questions/5248497/how-can-i-do-fast-image-processing-from-the-iphone-camera image at a point via setNeedsDisplay which I call on the main thread. This works but it is fairly slow 50 ms per frame measured between drawRect calls for a 192 x 144 preset and I've seen applications on the App Store which work faster than this. About..
http://stackoverflow.com/questions/5890499/pcm-audio-amplitude-values in the air cause the microphone surface to vibrate as well as in move up and down. When it moves down that might be measured or sampled a positive value. When it moves up that might be sampled as a negative value. Or it could be the opposite. When..
Store orientation to an array - and compare http://stackoverflow.com/questions/6368618/store-orientation-to-an-array-and-compare example with 1D arrays. In the database we already have the following 2 arrays Array 1 5 3 1 Array 2 1 3 5 8 8 We measured 2 4 6 7 . Which array is the most similar to the newly measured Obviously the second array is similar to the newly measured.. following 2 arrays Array 1 5 3 1 Array 2 1 3 5 8 8 We measured 2 4 6 7 . Which array is the most 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.. 2 4 6 7 . Which array is the most 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..
Visual viewport vs Layout viewport on mobile devices http://stackoverflow.com/questions/7344886/visual-viewport-vs-layout-viewport-on-mobile-devices iphone html safari viewport share improve this question Both the layout viewport and visual viewport are measured in CSS pixels. This is an important distinction to make. As opposed to the physical pixels on the device CSS pixels are..
What are the advantages and disadvantages of using ARC? [closed] http://stackoverflow.com/questions/7888568/what-are-the-advantages-and-disadvantages-of-using-arc sources and do the right thing in most cases . With ARC and GC you will still need to give some guidance. I've not measured this but it may be worth mentioning that compiling ARC sources would take more time and resources. If the program you're..
iPhone GPS - Battery Draining Extremely Fast http://stackoverflow.com/questions/8689626/iphone-gps-battery-draining-extremely-fast whenever cell tower will change and hence consumes battery really fast. distanceFilter The minimum distance measured in meters a device must move laterally before an update event is generated. On the basis of distance filter we get the GPS..
iPhone take augmented reality screenshot with AVCaptureVideoPreviewLayer http://stackoverflow.com/questions/8980847/iphone-take-augmented-reality-screenshot-with-avcapturevideopreviewlayer NULL true kCGRenderingIntentDefault OpenGL ES measures data in PIXELS Create a graphics context with the target size measured in POINTS NSInteger widthInPoints NSInteger heightInPoints if NULL UIGraphicsBeginImageContextWithOptions On iOS 4 and.. coordinate system Flip the CGImage by rendering it to the flipped bitmap context The size of the destination area is measured in POINTS CGContextSetBlendMode cgcontext kCGBlendModeCopy CGContextDrawImage cgcontext CGRectMake 0.0 0.0 widthInPoints..
What's the difference between frame and layout in Interface builder's size inspector? http://stackoverflow.com/questions/914102/whats-the-difference-between-frame-and-layout-in-interface-builders-size-inspe
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