2014/10/15 下午 10:08:29
iphone Programming Glossary: essentiallyDelete/Reset all entries in Core Data? http://stackoverflow.com/questions/1077810/delete-reset-all-entries-in-core-data I just want to reset it to blank. Edit I'm looking to do this programmatically so that a user can essentially hit a reset button. iphone cocoa cocoa touch core data share improve this question You can still..
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 RGB values for a pixel on an image on the 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..
UIScrollView. Any thoughts on implementing “infinite” scroll/zoom? http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom Any thoughts on implementing &ldquo infinite&rdquo scroll zoom So UITableView supports essentially infinite scrolling. There' may be a limit but that sucker can scroll for a looonnnggg time. I would.. it can cause infinte data explosion. Have others out there pondered this idea Yah I know we are essentially talking about re creating Google Maps here. Any insights would be much appreciated. Cheers Doug iphone..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer path CGContextEOFillPath context Release the paths CGPathRelease path CGPathRelease visiblePath So essentially there are the following steps Create your path Set the fill color you want add this path to the context..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview to generate an image mask on the fly UIImage with the rounded corner I need. This function essentially needs 5 parameters the bounds of the image and 4 corner radius top left top right bottom left and bottom..
Is there a way to pass touches through on the iPhone? http://stackoverflow.com/questions/631427/is-there-a-way-to-pass-touches-through-on-the-iphone to allow the user to drag from the button directly into the main area and take the same action essentially the touchesBegan and touchesMoved should be passed on to the main view when touching the UIButtons but..
Delete/Reset all entries in Core Data? http://stackoverflow.com/questions/1077810/delete-reset-all-entries-in-core-data entries stored in Core Data My schema should stay the same I just want to reset it to blank. Edit I'm looking to do this programmatically so that a user can essentially hit a reset button. iphone cocoa cocoa touch core data share improve this question You can still delete the file programmatically using the NSFileManager removeItemAtPath..
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 to get the RGB values for a pixel on an image on the 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..
UIScrollView. Any thoughts on implementing “infinite” scroll/zoom? http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom Any thoughts on implementing &ldquo infinite&rdquo scroll zoom So UITableView supports essentially infinite scrolling. There' may be a limit but that sucker can scroll for a looonnnggg time. I would like to mimic this behavior with a UIScrollView but there are.. 2 zooming can blow any lazy loading scheme all to hell since it can cause infinte data explosion. Have others out there pondered this idea Yah I know we are essentially talking about re creating Google Maps here. Any insights would be much appreciated. Cheers Doug iphone cocoa touch uiscrollview share improve this question ..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer CGContextSaveGState context CGContextAddPath context path CGContextEOFillPath context Release the paths CGPathRelease path CGPathRelease visiblePath So essentially there are the following steps Create your path Set the fill color you want add this path to the context and fill the context Now create a larger rectangle that..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview something useful. Solution 1 First of all I created this function to generate an image mask on the fly UIImage with the rounded corner I need. This function essentially needs 5 parameters the bounds of the image and 4 corner radius top left top right bottom left and bottom right . static inline UIImage MTDContextCreateRoundedMask..
Is there a way to pass touches through on the iPhone? http://stackoverflow.com/questions/631427/is-there-a-way-to-pass-touches-through-on-the-iphone current action when tapping in the main area. I would also like to allow the user to drag from the button directly into the main area and take the same action essentially the touchesBegan and touchesMoved should be passed on to the main view when touching the UIButtons but also should send the button press action. Right now I have..
Delete/Reset all entries in Core Data? http://stackoverflow.com/questions/1077810/delete-reset-all-entries-in-core-data should stay the same I just want to reset it to blank. Edit I'm looking to do this programmatically so that a user can essentially hit a reset button. iphone cocoa cocoa touch core data share improve this question You can still delete the file programmatically..
http://stackoverflow.com/questions/1180550/weird-switch-error-in-obj-c a declaration or a statement . The problem lies in the way a labeled statement a goto label case label or default essentially the ... statements is defined which is loosely defined ... zero or more statements . It is not as one might intuitively.. might intuitively expect zero or more statements or declarations . The use of a right after the labeled statement s essentially terminates the zero or more statements part of a labeled statement . This causes the grammar to fall back to the compound..
How to use OpenGL ES on a separate thread on iphone? http://stackoverflow.com/questions/1253145/how-to-use-opengl-es-on-a-separate-thread-on-iphone contexts between threads to allow asynchronous loading of textures from disk. But iOS5's CVOpenGLESTextureCaches essentially make texture uploads free so I don't need shareGroups anymore and my code is simpler and faster. share improve this answer..
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 to get the RGB values for a pixel on an image on the 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..
UIScrollView. Any thoughts on implementing “infinite” scroll/zoom? http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom Any thoughts on implementing &ldquo infinite&rdquo scroll zoom So UITableView supports essentially infinite scrolling. There' may be a limit but that sucker can scroll for a looonnnggg time. I would like to mimic this behavior.. all to hell since it can cause infinte data explosion. Have others out there pondered this idea Yah I know we are essentially talking about re creating Google Maps here. Any insights would be much appreciated. Cheers Doug iphone cocoa touch uiscrollview..
http://stackoverflow.com/questions/1757303/parsing-json-dates-on-iphone Quote from Rick Strahl There's no JavaScript date literal and Microsoft engineered a custom date format that is essentially a marked up string. The format is a string that's encoded and contains the standard new Date milliseconds since 1970 value...
problem with “this class is not key value coding-compliant” http://stackoverflow.com/questions/3760803/problem-with-this-class-is-not-key-value-coding-compliant the cell is nil as you've yet to create it and dequeue is passing nil back so even pass cell as the owner is still essentially passing nil . Two options Instantiate a new cell in your cellForRowAtIndexPath NSIndexPath indexPath implementation and..
http://stackoverflow.com/questions/4194394/client-server-gksessions of P2P mode in Apple's doco it's important to realise that the amazing P2P feature is more of a novelty. In fact for essentially all game networking you will definitely need normal everyday client server spoke style networking. Just to ne crystal clear..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer context path CGContextEOFillPath context Release the paths CGPathRelease path CGPathRelease visiblePath So essentially there are the following steps Create your path Set the fill color you want add this path to the context and fill the context..
How can I extract a URL from a sentence that is in a NSString? http://stackoverflow.com/questions/4590440/how-can-i-extract-a-url-from-a-sentence-that-is-in-a-nsstring you're ok or find one online that you can use. For a tutorial on using the class see here . The code you want essentially looks like this using John Gruber's super URL regex NSRegularExpression expression NSRegularExpression regularExpressionWithPattern..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview all I created this function to generate an image mask on the fly UIImage with the rounded corner I need. This function essentially needs 5 parameters the bounds of the image and 4 corner radius top left top right bottom left and bottom right . static..
NSString @property, using copy instead of retain http://stackoverflow.com/questions/587414/nsstring-property-using-copy-instead-of-retain question Yes it's so that it can make a unique copy without affecting the existing data. The synthesized setters essentially look like this For @synthesize nonatomic retain foo void setFoo NSFoo theFoo theFoo retain retain new value foo release..
Is there a way to pass touches through on the iPhone? http://stackoverflow.com/questions/631427/is-there-a-way-to-pass-touches-through-on-the-iphone area. I would also like to allow the user to drag from the button directly into the main area and take the same action essentially the touchesBegan and touchesMoved should be passed on to the main view when touching the UIButtons but also should send..
Post photo on user's wall using Facebook iOS SDK http://stackoverflow.com/questions/6702135/post-photo-on-users-wall-using-facebook-ios-sdk then post to the wall. FB's preferred solution appears to be to use the FB dialogs that are part of the mobile toolkit essentially little web pages much like the OAuth screen. Personally I plan to simply post to the album as above and live with FB's idea..
Can you reference Xib files from static libraries on the iPhone? http://stackoverflow.com/questions/707429/can-you-reference-xib-files-from-static-libraries-on-the-iphone classes code and variables that were linked together by the library creator. It does not contain other files it is essentially a database of compiled code. Although it would be possible to put the data for the xibs in there Xcode would have no way.. was in there as it looks for them as individual files on the filesystem. In Mac OS you may create a Framework which is essentially a bundle of code resources settings etc which may be reused by multiple projects. However Apple does not seem to support..
What is the difference between a .xib file and a .storyboard? http://stackoverflow.com/questions/8436324/what-is-the-difference-between-a-xib-file-and-a-storyboard Pre storyboard each UIViewController had an associated .xib with it. Storyboard achieves two things .storyboard is essentially one single file for all your screens in the app and it shows the flow of the screens. You can add segues transitions between..
Secure https encryption for iPhone app to webpage http://stackoverflow.com/questions/9181186/secure-https-encryption-for-iphone-app-to-webpage can view this page How else would I have a secure simple webview on the iPhone without requiring the user to log in essentially they buying the app will constitute their authentication to the page Can anyone help with this iphone authentication https..
iPhone SDK on Windows (alternative solutions) http://stackoverflow.com/questions/928656/iphone-sdk-on-windows-alternative-solutions improve this question You could easily build an app using PhoneGap or Appcelerators Titanium Mobile . Both of these essentially act as a WebKit wrapper so you can build your application with HTML CSS JavaScript. It's a pretty portable solution too..
create UIImageView with portion of image file http://stackoverflow.com/questions/1049102/create-uiimageview-with-portion-of-image-file UIImageView with portion of image file I'm subclassing UIImageView to create a tile based application. Essentially I am taking a single image file and breaking it up into pieces and then assigning the pieces to my tiles UIImageViews so..
Checking memory allocation in Instruments http://stackoverflow.com/questions/1061235/checking-memory-allocation-in-instruments tool is designed to graph total object allocation over time and it doesn't take deallocations into account. Essentially it will always go up . What you can do is look at the Net Bytes and # Net columns. These columns will adjust based on the..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs recently was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame of what you would assume the UIScrollView would have under normal circumstances. Place the UIScrollView..
http://stackoverflow.com/questions/1225548/access-default-email-address default account address on the device. How can I access this address to place it into a string for the setToRecipients Essentially I'm going to let the user send an email to themselves as the default To with an attachment inside the app. iphone share..
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 bitmapData CFRangeMake 0 CFDataGetLength bitmapData pixelByteData Cast a pointer to the first element of pixelByteData Essentially what we're doing is making a second pointer that divides the byteData's units differently instead of dividing each unit..
http://stackoverflow.com/questions/14659563/to-drawrect-or-not-to-drawrect-when-should-one-use-drawrect-core-graphics-vs-su table scrolling buttery smooth the secret is to NOT use subviews but instead do all the drawing in one custom uiview. Essentially it seems that using lots of subviews slows rendering down because they have lots of overhead and are constantly re composited..
Detecting UITableView scrolling http://stackoverflow.com/questions/1587855/detecting-uitableview-scrolling touchesMoved and touchesCancelled so that I can detect when a touch based event is being handled on a UITableView. Essentially what I need to detect is when the UITableView is scrolling up or down. However subclassing UITableView and creating the..
iPhone: CALayer + rotate in 3D + antialias? http://stackoverflow.com/questions/2686027/iphone-calayer-rotate-in-3d-antialias the problem is the edges of the resulting picture don't seem to be antialiased at all. Anybody know how to make it so Essentially I'm implementing my own version of CoverFlow yeah yeah design patent blah blah using quartz 3d transformations to do everything...
Adding a UILabel to a UIToolbar http://stackoverflow.com/questions/333441/adding-a-uilabel-to-a-uitoolbar ios share improve this question Have a look into this UIBarButtonItem alloc initWithCustomView yourCustomView Essentially every item must be a button but they can be instantiated with any view you require. Here is some example code. Note since..
COMET (server push to client) on iPhone http://stackoverflow.com/questions/337985/comet-server-push-to-client-on-iphone I'm looking to establish some kind of socket COMET type functionality from my server s to my iPhone application. Essentially anytime a user manages to set an arbitrary object 'dirty' on the server by say updating their Address.. the feedback should..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie which in turn has a method called appendSampleBuffer that lets you add individual frames to a video stream. Essentially you 耱l have to 1 Wire the writer NSError error nil AVAssetWriter videoWriter AVAssetWriter alloc initWithURL NSURL fileURLWithPath..
Detect iPhone/iPad purely by css http://stackoverflow.com/questions/3839809/detect-iphone-ipad-purely-by-css
Obtain Apple software id number before appstore submission (for Appirater) http://stackoverflow.com/questions/4153186/obtain-apple-software-id-number-before-appstore-submission-for-appirater To get your software id from Apple log into iTunesConnect and go through the process of submitting your app. Essentially perform every step except the binary upload. At that point you'll have an Apple ID for your app which you can use in Appirater...
Does UIActivityIndicator require manual threading on iPhone http://stackoverflow.com/questions/441345/does-uiactivityindicator-require-manual-threading-on-iphone the apple iPhone forums. https devforums.apple.com message 24220#24220 #Note you have to have an appleID to view it. Essentially yes you do need to start your process running in a different thread but its quite easy to do as paraphrased from user 'eskimo1'..
port an iOS (iPhone) app to mac? http://stackoverflow.com/questions/4579849/port-an-ios-iphone-app-to-mac Be aware of the infamous sibling views don't work on OSX problem if you stack up a lot of views in your iOS app. Essentially you will have to change to using layers instead of simply views on the Mac if you rely on nested hierarchies of views here..
LLVM vs. GCC for iOS development [closed] http://stackoverflow.com/questions/4589335/llvm-vs-gcc-for-ios-development
iPhone App Crashing - Error Question http://stackoverflow.com/questions/46220/iphone-app-crashing-error-question Question I'm writing my first iPhone app so I haven't gotten around to figuring out much in the way of debugging. Essentially my app displays an image and when touched plays a short sound. When compiling and building the project in XCode everything..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview self.view addSubview testView testView release super viewDidLoad Solution 2 This solution is a bit more dirty . Essentially you could create a mask layer with the rounded corner you need all corners . Then you should increase the height of the..
What work has been done on cross-platform mobile development? [closed] http://stackoverflow.com/questions/51988/what-work-has-been-done-on-cross-platform-mobile-development mobile webos share improve this question The HTML5 standard has support for releasing stand alone HTML5 apps. Essentially a HTML5 app is a bundle of HTML5 JavaScript and CSS files that will run stand alone in the browser of the desktop or device...
AES interoperability between .Net and iPhone? http://stackoverflow.com/questions/538435/aes-interoperability-between-net-and-iphone of the base64 decoded string is Salted__ . You can also ask openssl to not use a salt nosalt and or provide an IV iv . Essentially openssl .Net and the iPhone are using the same encryption you just need to be careful how you initialize the APIs with the..
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