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2014/10/15 ¤U¤È 10:05:22
iphone Programming Glossary: complexiPhone viewWillAppear not firing http://stackoverflow.com/questions/131062/iphone-viewwillappear-not-firing expect the added view s to be wired up for viewWillAppear events. Does anyone have an example of a complex programmatic view heirarchy that successfully recieves viewWillAppear events at every level Apple's..
Use CoreData or SQLite on iPhone? [closed] http://stackoverflow.com/questions/1318467/use-coredata-or-sqlite-on-iphone or complicated subtable views In summary Core Data can greatly simplify your code particularly for complex object models. You get undo redo support almost for free with it. It also provides some very significant..
http://stackoverflow.com/questions/1388467/reading-epub-format actually once you've got the basics unzipping parsing XML down it's not particularly difficult or complex. You'll need to work out how to download the EPUB to unzip it somewhere to parse the manifest and then..
Disabling implicit animations in -[CALayer setNeedsDisplayInRect:] http://stackoverflow.com/questions/2244147/disabling-implicit-animations-in-calayer-setneedsdisplayinrect implicit animations in CALayer setNeedsDisplayInRect I've got a layer with some complex drawing code in its drawInContext method. I'm trying to minimize the amount of drawing I need to do..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework 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 44Hz ie The lowest frequency we can reliably.. 0 which is often referred to as 'DC Offset'. It so happens that Bin 0 and Bin n 2 will always have complex component 0 so A 0 .realp is used to store Bin 0 and A 0 .imagp is used to store Bin n 2 And the magnitude.. 0 .realp is used to store Bin 0 and A 0 .imagp is used to store Bin n 2 And the magnitude of each complex number is the amount of energy vibrating around that frequency. So as you can see it wouldn't be a very..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer will be the shape that gets the inner shadow In this case it's just a rounded rect but could be as complex as your want CGMutablePathRef visiblePath CGPathCreateMutable CGRect innerRect CGRectInset bounds radius..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud handling have moved on a lot since then. Retina makes images bigger and loading them slightly more complex. With the built in support for iPad and retina images you should certainly use ImageNamed in your code...
iPhone viewWillAppear not firing http://stackoverflow.com/questions/131062/iphone-viewwillappear-not-firing and call addSubView on that controller I would expect the added view s to be wired up for viewWillAppear events. Does anyone have an example of a complex programmatic view heirarchy that successfully recieves viewWillAppear events at every level Apple's Docs state Warning If the view belonging to a view controller..
Use CoreData or SQLite on iPhone? [closed] http://stackoverflow.com/questions/1318467/use-coredata-or-sqlite-on-iphone app on the iphone with one table and no relationships or complicated subtable views In summary Core Data can greatly simplify your code particularly for complex object models. You get undo redo support almost for free with it. It also provides some very significant performance benefits particularly on the iPhone. Even though..
http://stackoverflow.com/questions/1388467/reading-epub-format plus a few extra files The specs look a bit daunting but actually once you've got the basics unzipping parsing XML down it's not particularly difficult or complex. You'll need to work out how to download the EPUB to unzip it somewhere to parse the manifest and then to display the relevant content. Some pointers if you're..
Disabling implicit animations in -[CALayer setNeedsDisplayInRect:] http://stackoverflow.com/questions/2244147/disabling-implicit-animations-in-calayer-setneedsdisplayinrect implicit animations in CALayer setNeedsDisplayInRect I've got a layer with some complex drawing code in its drawInContext method. I'm trying to minimize the amount of drawing I need to do so I'm using setNeedsDisplayInRect to update just the changed..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework 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 44Hz ie The lowest frequency we can reliably detect is ONE complete wave within that window ie a 44Hz.. or n 2 bin 1 .idealFreq Actually there is an extra Bin Bin 0 which is often referred to as 'DC Offset'. It so happens that Bin 0 and Bin n 2 will always have complex component 0 so A 0 .realp is used to store Bin 0 and A 0 .imagp is used to store Bin n 2 And the magnitude of each complex number is the amount of energy vibrating.. Bin 0 and Bin n 2 will always have complex component 0 so A 0 .realp is used to store Bin 0 and A 0 .imagp is used to store Bin n 2 And the magnitude of each complex number is the amount of energy vibrating around that frequency. So as you can see it wouldn't be a very great pitch detector as it doesn't have nearly fine enough..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer 0.5f CGRectGetHeight bounds Create the visible path which will be the shape that gets the inner shadow In this case it's just a rounded rect but could be as complex as your want CGMutablePathRef visiblePath CGPathCreateMutable CGRect innerRect CGRectInset bounds radius radius CGPathMoveToPoint visiblePath NULL innerRect.origin.x..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud question dates from iOS 1.0 Image requirements and handling handling have moved on a lot since then. Retina makes images bigger and loading them slightly more complex. With the built in support for iPad and retina images you should certainly use ImageNamed in your code. Now for posterity's sake The sister thread on the Apple..
iPhone viewWillAppear not firing http://stackoverflow.com/questions/131062/iphone-viewwillappear-not-firing controller I would expect the added view s to be wired up for viewWillAppear events. Does anyone have an example of a complex programmatic view heirarchy that successfully recieves viewWillAppear events at every level Apple's Docs state Warning If..
Use CoreData or SQLite on iPhone? [closed] http://stackoverflow.com/questions/1318467/use-coredata-or-sqlite-on-iphone no relationships or complicated subtable views In summary Core Data can greatly simplify your code particularly for complex object models. You get undo redo support almost for free with it. It also provides some very significant performance benefits..
http://stackoverflow.com/questions/1388467/reading-epub-format a bit daunting but actually once you've got the basics unzipping parsing XML down it's not particularly difficult or complex. You'll need to work out how to download the EPUB to unzip it somewhere to parse the manifest and then to display the relevant..
Disabling implicit animations in -[CALayer setNeedsDisplayInRect:] http://stackoverflow.com/questions/2244147/disabling-implicit-animations-in-calayer-setneedsdisplayinrect implicit animations in CALayer setNeedsDisplayInRect I've got a layer with some complex drawing code in its drawInContext method. I'm trying to minimize the amount of drawing I need to do so I'm using setNeedsDisplayInRect..
iPhone: How to Pass Data Between Several Viewcontrollers in a Tabbar App http://stackoverflow.com/questions/2363777/iphone-how-to-pass-data-between-several-viewcontrollers-in-a-tabbar-app delegate myLocalProperty appDelegate.someDataModelProperty This will work for small project but as your data grows complex you should create a dedicated class for your data model. Edit To clarify for your specific case you would add the call to..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework 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 44Hz ie The lowest frequency we can reliably detect is ONE.. is an extra Bin Bin 0 which is often referred to as 'DC Offset'. It so happens that Bin 0 and Bin n 2 will always have complex component 0 so A 0 .realp is used to store Bin 0 and A 0 .imagp is used to store Bin n 2 And the magnitude of each complex.. component 0 so A 0 .realp is used to store Bin 0 and A 0 .imagp is used to store Bin n 2 And the magnitude of each complex number is the amount of energy vibrating around that frequency. So as you can see it wouldn't be a very great pitch detector..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer visible path which will be the shape that gets the inner shadow In this case it's just a rounded rect but could be as complex as your want CGMutablePathRef visiblePath CGPathCreateMutable CGRect innerRect CGRectInset bounds radius radius CGPathMoveToPoint..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud and handling handling have moved on a lot since then. Retina makes images bigger and loading them slightly more complex. With the built in support for iPad and retina images you should certainly use ImageNamed in your code. Now for posterity's..
iPhone Accelerate Framework FFT vs Matlab FFT http://stackoverflow.com/questions/10820488/iphone-accelerate-framework-fft-vs-matlab-fft fft_data fft_data.realp double malloc 8 sizeof double fft_data.imagp double malloc 8 sizeof double vDSP_ctoz COMPLEX ffx 2 fft_data 1 nOver2 split data 1 16 into odds and evens vDSP_fft_zrip fftSetup fft_data 1 log2n kFFTDirection_Forward.. fft forward vDSP_fft_zrip fftSetup fft_data 1 log2n kFFTDirection_Inverse fft inverse vDSP_ztoc fft_data 2 COMPLEX ffx 1 nOver2 combine complex back into real numbers Objective C output ffx now contains 272.000000 16.000000 16.000000 16.000000..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework n real #s as n 2 complex #s 2 1i 4 3i ... 2. splits to A.realP 2 4 ... n 2 elts A.compP 1 3 ... n 2 elts vDSP_ctoz COMPLEX originalReal 2 stride 2 as each complex # is 2 floats A 1 stride 1 in A.realP .compP nOver2 n 2 elts You would really.. 1 in A.realP .compP nOver2 n 2 elts You would really need to look at how A is allocated 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..
iPhone FFT with Accelerate framework vDSP http://stackoverflow.com/questions/6358764/iphone-fft-with-accelerate-framework-vdsp vDSP_ctoz to get a split complex vector which for a real signal divides into an even odd configuration. vDSP_ctoz COMPLEX originalReal 2 A 1 nOver2 Set up the required memory for the FFT routines and check its availability. setupReal vDSP_create_fftsetup.. The output signal is now in a split real form. Use the function vDSP_ztoc to get a split real vector. vDSP_ztoc A 1 COMPLEX obtainedReal 2 nOver2 Check for accuracy by looking at the inverse transform results. Compare originalReal obtainedReal..
FFT on iPhone to ignore background noise and find lower pitches http://stackoverflow.com/questions/7181630/fft-on-iphone-to-ignore-background-noise-and-find-lower-pitches data AudioUnitRender ... convert int16 to float Convert ... divide the signal into even odd configuration vDSP_ctoz COMPLEX outputBuffer 2 A 1 nOver2 apply the fft vDSP_fft_zrip fftSetup A stride log2n FFT_FORWARD convert split real form to split.. apply the fft vDSP_fft_zrip fftSetup A stride log2n FFT_FORWARD convert split real form to split vector vDSP_ztoc A 1 COMPLEX outputBuffer 2 nOver2 Demetri then goes on to determine the 'dominant' frequency as follows float dominantFrequency 0 int..
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