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2014/10/15 ¤U¤È 10:12:48
iphone Programming Glossary: pointUIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs final step is to override UIView hitTest withEvent inside the ClipView . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This.. withEvent inside the ClipView . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the touch area of the.. inside the ClipView . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the touch area of the UIScrollView..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone Encryption for an NSString on the iPhone Can anybody point me in the right direction to be able to encrypt a string returning another string with the encrypted.. like this Note The printf calls are only for demonstrating the state of the data at various points in a real application it wouldn't make sense to print such values. int main int argc const char argv..
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 implement something equivalent to the 'eyedropper' tool in photoshop where you can touch a point on the image and capture the RGB values for the pixel in question to determine and match its color... been said on this page that can be found at the bottom of this post. I am editing the post at this point however to post what I propose is at least for my requirements which include modifying pixel data a.. byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA bytes in memory RPVW_RGBAPixel pixelData The pixel struct with alpha in this version..
How to customize the callout bubble for MKAnnotationView? http://stackoverflow.com/questions/1565828/how-to-customize-the-callout-bubble-for-mkannotationview I have a custom annotation view I am using and I want to use the image property to display the point on the map with my own icon. I have this working fine. But what I would also like to do is to override.. the default callout bubble is not drawn . So I have no way of knowing if the user touched on my point on the map selected it or touched a point that is not part of my annotation views delected it without.. . So I have no way of knowing if the user touched on my point on the map selected it or touched a point that is not part of my annotation views delected it without having the default callout bubble view show..
How can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone If you find the answer useful please vote up the question being a community wiki I should not get points for this voting but it will help others find it How can I get a path into which file writes are allowed.. put images that you don't care exist for the long term or not the phone may delete them at some point NSArray paths NSSearchPathForDirectoriesInDomains NSCachesDirectory NSUserDomainMask YES NSString cachePath..
JSON and Core Data on the iPhone http://stackoverflow.com/questions/2362323/json-and-core-data-on-the-iphone relationship between entities . I have searched unsuccessfully for a tutorial code sample on this point so any assistance would be gratefully received. iphone objective c json core data share improve this..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received a little while before you really internalise the memory management rules unless you make a big point of it. Remember anything you get from an allocation function usually the static alloc method but there..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework 512 44Hz The highest frequency we can detect known as the Nyquist frequency is where every pair of points represents a wave ie 512 complete waves within the window ie 512 44Hz or n 2 bin 1 .idealFreq Actually.. use of the stuff we just precalculated vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD At this point A will be containing n 2 complex numbers only the first one is actually two real numbers DC offset Nyquist..
How to determine the content size of a UIWebView? http://stackoverflow.com/questions/3936041/how-to-determine-the-content-size-of-a-uiwebview fittingSize aWebView.frame frame NSLog @ size f f fittingSize.width fittingSize.height I should point out there's another approach thanks @GregInYEG using JavaScript. Not sure which solution performs better...
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell 0.0f CGContextStrokePath c return no need to bother drawing rounded corners so we return At this point the clip rect is set to only draw the appropriate corners so we fill and stroke a rounded rect taking..
Set the maximum character length of a UITextField http://stackoverflow.com/questions/433337/set-the-maximum-character-length-of-a-uitextfield asks the delegate if the specified text should be changed. The text field has not changed at this point so we grab it's current length and the string length we're inserting minus the range length. If this..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload dismissModalViewControllerAnimated YES submitButton.enabled YES I then at some point send it to my web server using the ASI classes ASIFormDataRequest request ASIFormDataRequest requestWithURL..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c the caller of this function. return s autorelease I realize all of this is a bit confusing at some point though it will click. Here are a few references to get you going Apple's introduction to memory management...
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now bet is with en0 . The MAC is always present even if the interface has no IP is down. Edit 2 As was pointed out by others the preferred solution since iOS 6 is UIDevice identifierForVendor . In most cases you.. the app starts for the first time is what Apple seems to want you to use . Edit 3 So this major point doesn't get lost in the comment noise do not use the MAC as UUID create a hash using the MAC . That..
http://stackoverflow.com/questions/8275578/how-to-get-information-about-free-memory-and-running-processes-in-an-app-store-a this information. The evidence I'm already searching for days but can't find any good starting point. How can this app figure all this stuff out without any jailbreaking hacking etc. Until recently I was..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs Also the ClipView needs a reference to the UIScrollView . The final step is to override UIView hitTest withEvent inside the ClipView . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the touch area of the UIScrollView to the.. the UIScrollView . The final step is to override UIView hitTest withEvent inside the ClipView . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the touch area of the UIScrollView to the frame of its parent's view exactly what.. . The final step is to override UIView hitTest withEvent inside the ClipView . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the touch area of the UIScrollView to the frame of its parent's view exactly what you need...
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone Encryption for an NSString on the iPhone Can anybody point me in the right direction to be able to encrypt a string returning another string with the encrypted data I've been trying with AES256 encryption. I want to write.. include their code for the NSData category you can write something like this Note The printf calls are only for demonstrating the state of the data at various points in a real application it wouldn't make sense to print such values. int main int argc const char argv NSAutoreleasePool pool NSAutoreleasePool alloc init NSString..
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 iphone I am writing an iPhone application and need to essentially implement something equivalent to the 'eyedropper' tool in photoshop where you can touch a point on the image and capture the RGB values for the pixel in question to determine and match its color. Getting the UIImage is the easy part but is there a way to convert.. evening with a consolidation and small addition to what had been said on this page that can be found at the bottom of this post. I am editing the post at this point however to post what I propose is at least for my requirements which include modifying pixel data a better method as it provides writable data whereas as I understand.. I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA bytes in memory RPVW_RGBAPixel pixelData The pixel struct with alpha in this version typedef struct RGBAPixel byte red byte green byte blue..
How to customize the callout bubble for MKAnnotationView? http://stackoverflow.com/questions/1565828/how-to-customize-the-callout-bubble-for-mkannotationview I'm currently working with the mapkit and am stuck. I have a custom annotation view I am using and I want to use the image property to display the point on the map with my own icon. I have this working fine. But what I would also like to do is to override the default callout view the bubble that shows up with the.. called if I have this set to NO which is what I want so that the default callout bubble is not drawn . So I have no way of knowing if the user touched on my point on the map selected it or touched a point that is not part of my annotation views delected it without having the default callout bubble view show up. I tried going.. what I want so that the default callout bubble is not drawn . So I have no way of knowing if the user touched on my point on the map selected it or touched a point that is not part of my annotation views delected it without having the default callout bubble view show up. I tried going down a different path and just handling..
How can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone wiki so that others may flesh out question and answer s . If you find the answer useful please vote up the question being a community wiki I should not get points for this voting but it will help others find it How can I get a path into which file writes are allowed on the iPhone You can misleadingly write anywhere you like.. user documents. Last there is a cache directory where you can put images that you don't care exist for the long term or not the phone may delete them at some point NSArray paths NSSearchPathForDirectoriesInDomains NSCachesDirectory NSUserDomainMask YES NSString cachePath paths objectAtIndex 0 BOOL isDir NO NSError error if..
JSON and Core Data on the iPhone http://stackoverflow.com/questions/2362323/json-and-core-data-on-the-iphone JSON string back into core data objects again preserving the relationship between entities . I have searched unsuccessfully for a tutorial code sample on this point so any assistance would be gratefully received. iphone objective c json core data share improve this question First pick a JSON library to use I personally..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received in general. If you've come from another background it can take a little while before you really internalise the memory management rules unless you make a big point of it. Remember anything you get from an allocation function usually the static alloc method but there are a few others or a copy method you own the memory too..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework 44Hz wave. bin 2 .idealFreq 2 44Hz etc. bin 512 .idealFreq 512 44Hz The highest frequency we can detect known as the Nyquist frequency is where every pair of points represents a wave ie 512 complete waves within the window ie 512 44Hz or n 2 bin 1 .idealFreq Actually there is an extra Bin Bin 0 which is often referred to as.. and use it for everything. Now the actual transforms making use of the stuff we just precalculated vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD At this point A will be containing n 2 complex numbers only the first one is actually two real numbers DC offset Nyquist # masquerading as a complex number. The documentation..
How to determine the content size of a UIWebView? http://stackoverflow.com/questions/3936041/how-to-determine-the-content-size-of-a-uiwebview CGSize fittingSize aWebView sizeThatFits CGSizeZero frame.size fittingSize aWebView.frame frame NSLog @ size f f fittingSize.width fittingSize.height I should point out there's another approach thanks @GregInYEG using JavaScript. Not sure which solution performs better. Of two hacky solutions I like this one better. share..
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell rect.size.height CGContextAddLineToPoint c rect.size.width 0.0f CGContextStrokePath c return no need to bother drawing rounded corners so we return At this point the clip rect is set to only draw the appropriate corners so we fill and stroke a rounded rect taking the entire rect CGContextBeginPath c addRoundedRectToPath..
Set the maximum character length of a UITextField http://stackoverflow.com/questions/433337/set-the-maximum-character-length-of-a-uitextfield 25 NO YES Before the text field changes the UITextField asks the delegate if the specified text should be changed. The text field has not changed at this point so we grab it's current length and the string length we're inserting minus the range length. If this value is too long more than 25 characters in this example return..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload imageView.image self.image self.navigationController dismissModalViewControllerAnimated YES submitButton.enabled YES I then at some point send it to my web server using the ASI classes ASIFormDataRequest request ASIFormDataRequest requestWithURL NSURL URLWithString @ http example.com myscript.php..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c is that the returned string will still be valid for the caller of this function. return s autorelease I realize all of this is a bit confusing at some point though it will click. Here are a few references to get you going Apple's introduction to memory management. Cocoa Programming for Mac OS X 4th Edition by Aaron..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now the MAC of the same interface of course. I guess the best bet is with en0 . The MAC is always present even if the interface has no IP is down. Edit 2 As was pointed out by others the preferred solution since iOS 6 is UIDevice identifierForVendor . In most cases you should be able use it as a drop in replacement to the old.. old UIDevice uniqueIdentifier but a UUID that is created when the app starts for the first time is what Apple seems to want you to use . Edit 3 So this major point doesn't get lost in the comment noise do not use the MAC as UUID create a hash using the MAC . That hash will always create the same result every time even across..
http://stackoverflow.com/questions/8275578/how-to-get-information-about-free-memory-and-running-processes-in-an-app-store-a well as free memory. So there MUST be an public API to access this information. The evidence I'm already searching for days but can't find any good starting point. How can this app figure all this stuff out without any jailbreaking hacking etc. Until recently I was sure that something like this is absolutely impossible on..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs the UIScrollView . The final step is to override UIView hitTest withEvent inside the ClipView . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the.. override UIView hitTest withEvent inside the ClipView . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the touch area of the UIScrollView to the.. hitTest withEvent inside the ClipView . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the touch area of the UIScrollView to the frame of its..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone Encryption for an NSString on the iPhone Can anybody point me in the right direction to be able to encrypt a string returning another string with the encrypted data I've been trying.. you can write something like this Note The printf calls are only for demonstrating the state of the data at various points in a real application it wouldn't make sense to print such values. int main int argc const char argv NSAutoreleasePool..
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 and need to essentially implement something equivalent to the 'eyedropper' tool in photoshop where you can touch a point on the image and capture the RGB values for the pixel in question to determine and match its color. Getting the UIImage.. to what had been said on this page that can be found at the bottom of this post. I am editing the post at this point however to post what I propose is at least for my requirements which include modifying pixel data a better method as it.. bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA bytes in memory RPVW_RGBAPixel pixelData The pixel struct with alpha in this version typedef struct..
How to customize the callout bubble for MKAnnotationView? http://stackoverflow.com/questions/1565828/how-to-customize-the-callout-bubble-for-mkannotationview mapkit and am stuck. I have a custom annotation view I am using and I want to use the image property to display the point on the map with my own icon. I have this working fine. But what I would also like to do is to override the default callout.. is what I want so that the default callout bubble is not drawn . So I have no way of knowing if the user touched on my point on the map selected it or touched a point that is not part of my annotation views delected it without having the default.. bubble is not drawn . So I have no way of knowing if the user touched on my point on the map selected it or touched a point that is not part of my annotation views delected it without having the default callout bubble view show up. I tried going..
How can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone and answer s . If you find the answer useful please vote up the question being a community wiki I should not get points for this voting but it will help others find it How can I get a path into which file writes are allowed on the iPhone You.. where you can put images that you don't care exist for the long term or not the phone may delete them at some point NSArray paths NSSearchPathForDirectoriesInDomains NSCachesDirectory NSUserDomainMask YES NSString cachePath paths objectAtIndex..
JSON and Core Data on the iPhone http://stackoverflow.com/questions/2362323/json-and-core-data-on-the-iphone again preserving the relationship between entities . I have searched unsuccessfully for a tutorial code sample on this point so any assistance would be gratefully received. iphone objective c json core data share improve this question First..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received background it can take a little while before you really internalise the memory management rules unless you make a big point of it. Remember anything you get from an allocation function usually the static alloc method but there are a few others..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework bin 512 .idealFreq 512 44Hz The highest frequency we can detect known as the Nyquist frequency is where every pair of points represents a wave ie 512 complete waves within the window ie 512 44Hz or n 2 bin 1 .idealFreq Actually there is an extra.. transforms making use of the stuff we just precalculated vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD At this point A will be containing n 2 complex numbers only the first one is actually two real numbers DC offset Nyquist # masquerading..
How to determine the content size of a UIWebView? http://stackoverflow.com/questions/3936041/how-to-determine-the-content-size-of-a-uiwebview CGSizeZero frame.size fittingSize aWebView.frame frame NSLog @ size f f fittingSize.width fittingSize.height I should point out there's another approach thanks @GregInYEG using JavaScript. Not sure which solution performs better. Of two hacky solutions..
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell c rect.size.width 0.0f CGContextStrokePath c return no need to bother drawing rounded corners so we return At this point the clip rect is set to only draw the appropriate corners so we fill and stroke a rounded rect taking the entire rect CGContextBeginPath..
Set the maximum character length of a UITextField http://stackoverflow.com/questions/433337/set-the-maximum-character-length-of-a-uitextfield the UITextField asks the delegate if the specified text should be changed. The text field has not changed at this point so we grab it's current length and the string length we're inserting minus the range length. If this value is too long more..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload self.image self.navigationController dismissModalViewControllerAnimated YES submitButton.enabled YES I then at some point send it to my web server using the ASI classes ASIFormDataRequest request ASIFormDataRequest requestWithURL NSURL URLWithString..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c still be valid for the caller of this function. return s autorelease I realize all of this is a bit confusing at some point though it will click. Here are a few references to get you going Apple's introduction to memory management. Cocoa Programming..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now I guess the best bet is with en0 . The MAC is always present even if the interface has no IP is down. Edit 2 As was pointed out by others the preferred solution since iOS 6 is UIDevice identifierForVendor . In most cases you should be able use.. that is created when the app starts for the first time is what Apple seems to want you to use . Edit 3 So this major point doesn't get lost in the comment noise do not use the MAC as UUID create a hash using the MAC . That hash will always create..
Behaviour for significant change location API when terminated/suspended? http://stackoverflow.com/questions/3421242/behaviour-for-significant-change-location-api-when-terminated-suspended you to turn on significant change and gps change APIs through the UI and log all the responses that you get back. N.B. Point six in the previous answer is not correct. Freeze dried suspended apps do receive CLLocationManagerDelegate callbacks when..
How to use Keychain access to store passwords in iPhone App? http://stackoverflow.com/questions/4143240/how-to-use-keychain-access-to-store-passwords-in-iphone-app iphone keychain share improve this question Simple iPhone Keychain Code Apple iPhone Keychain Backups Is There Any Point To Using The Keychain API On iPhone What you ™re left with is an encrypted flat file database specialized for just a few..
how to use DES algorithm to encrypt or decrypt some data in object-cï¼?/a> http://stackoverflow.com/questions/4601347/how-to-use-des-algorithm-to-encrypt-or-decrypt-some-data-in-object-c iphone keychain share improve this question Simple iPhone Keychain Code Apple iPhone Keychain Backups Is There Any Point To Using The Keychain API On iPhone What you ™re left with is an encrypted flat file database specialized for just a few..
iPhone : OpenGL ES : Detecting if you have tapped a object (cube) on screen http://stackoverflow.com/questions/4365856/iphone-opengl-es-detecting-if-you-have-tapped-a-object-cube-on-screen CGRectMake screenPositionOfThisCube.x TUNE screenPositionOfThisCube.y TUNE TUNE 2 TUNE 2 now check that the POINT OF THE TOUCH is inside the rect fingerSquish if CGRectContainsPoint fingerSquish pos NSLog @ WOOP YOU HAVE FOUND THE TOUCHED..
Drawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed edges at intersection UPDATED TO AN ANSWER BELOW #define VALUE _INDEX_ NSValue valueWithCGPoint points _INDEX_ #define POINT _INDEX_ NSValue points objectAtIndex _INDEX_ CGPointValue UIBezierPath smoothedPathWithGranularity NSInteger granularity.. points lastObject UIBezierPath smoothedPath self bezierPath smoothedPath removeAllPoints smoothedPath moveToPoint POINT 0 for NSUInteger index 1 index points.count 2 index CGPoint p0 POINT index 1 CGPoint p1 POINT index CGPoint p2 POINT index.. removeAllPoints smoothedPath moveToPoint POINT 0 for NSUInteger index 1 index points.count 2 index CGPoint p0 POINT index 1 CGPoint p1 POINT index CGPoint p2 POINT index 1 CGPoint p3 POINT index 2 now add n points starting at p1 dx dy up..
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