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2014/10/15 ¤U¤È 10:03:30
iphone Programming Glossary: actuallyHow to Rotate a UIImage 90 degrees? http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees to landscape . I don't want to use a CGAffineTransform. I want the pixels of the UIImage to actually shift position. I am using a block of code shown below originally intended to resize a UIImage to do..
http://stackoverflow.com/questions/1388467/reading-epub-format a zip file of everything in the manifest 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..
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 cachePath withIntermediateDirectories NO attributes nil error error Note that you have to actually create the Caches directory there so when writing you have to check and create every time Kind of a..
The simplest way to resize an UIImage? http://stackoverflow.com/questions/2658738/the-simplest-way-to-resize-an-uiimage and set the contentMode to one of the resizing options. Or you can use this utility method if you actually need to resize an image UIImage imageWithImage UIImage image scaledToSize CGSize newSize UIGraphicsBeginImageContext..
Starting iPhone app development in Linux? http://stackoverflow.com/questions/276907/starting-iphone-app-development-in-linux
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework very fast This code is really stupidly obscure it is generously commented but the comments don't actually make life any easier. Basically at the heart of it is vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD.. 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 overview explains..
Can I embed a custom font in an iPhone application? http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application that the bounty auto awards to the answer with the highest number of votes. Interesting. No one actually provided an answer that solved the question as asked the solution that involves coding your own UILabel..
Getting current device language in iOS? http://stackoverflow.com/questions/3910244/getting-current-device-language-in-ios en_US iphone objective c ios nslocale share improve this question The solutions provided will actually return the current region of the device not the currently selected language. These are often one and.. NS_AVAILABLE 10_5 2_0 note that this list does not indicate what language the app is actually running in the NSBundle mainBundle object determines that at launch and knows that information People..
How to determine the content size of a UIWebView? http://stackoverflow.com/questions/3936041/how-to-determine-the-content-size-of-a-uiwebview After that we can correct the wrong frame size by the fitting size. This sounds terrible but it's actually not that bad. Since we do both frame changes right after each other the view isn't updated and doesn't..
Get PDF hyperlinks on iOS with Quartz http://stackoverflow.com/questions/4080373/get-pdf-hyperlinks-on-ios-with-quartz working code. I'm posting it here so hopefully it'll help someone. It assumes the PDF document actually contains annotations. for int i 0 i pageCount i CGPDFPageRef page CGPDFDocumentGetPage doc i 1 CGPDFDictionaryRef..
How to capture UIView to UIImage without loss of quality on retina display http://stackoverflow.com/questions/4334233/how-to-capture-uiview-to-uiimage-without-loss-of-quality-on-retina-display to that of the screen. UIGraphicsBeginImageContext uses a fixed scale factor of 1.0 so you're actually getting exactly the same image on an iPhone 4 as on the other iPhones. I'll bet either the iPhone 4..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll iphone search core data uisearchbar uisearchdisplaycontroller share improve this question I actually just implemented this on one of my projects your question and the other wrong answer hinted at what.. other wrong answer hinted at what to do . I tried Sergio's answer but had exception issues when actually running on a device. Yes you create two fetch results controllers one for the normal display and another..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app the iPads in the Apple Store running the smart sign apps then you will know what I mean. It is actually pretty trivial to make this work all you need to do is install a correctly formatted mobile config plist..
How do I size a UITextView to its content? http://stackoverflow.com/questions/50467/how-do-i-size-a-uitextview-to-its-content of text in the notes string. iphone cocoa touch uikit share improve this question There is actually a very easy way to do resizing of the UITextView to its correct height of the content. It can be done..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown _controller performSelector @selector someMethod The reason for this is because the compiler actually is able to record all of the information about the selector and the object during compilation. It doesn't..
Syntax help - Variable as object name [duplicate] http://stackoverflow.com/questions/7940809/syntax-help-variable-as-object-name typo a string the compiler won't be able to catch it . I won't get into second guessing what you actually want to do that would depend on the goal of this part of your application but you can use an NSMutableDictionary..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview Thanks in advance html iphone uiwebview share improve this question The second question is actually easier to answer. Look at the stringWithContentsOfURL encoding error method of NSString it lets you..
How to Rotate a UIImage 90 degrees? http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees that I would like to rotate counter clockwise by 90 degrees to landscape . I don't want to use a CGAffineTransform. I want the pixels of the UIImage to actually shift position. I am using a block of code shown below originally intended to resize a UIImage to do this. I set a target size as the current size of the UIImage..
http://stackoverflow.com/questions/1388467/reading-epub-format XML file one to define how everything is packaged up OEBPS a zip file of everything in the manifest 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..
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 isDir isDir NO NSFileManager defaultManager createDirectoryAtPath cachePath withIntermediateDirectories NO attributes nil error error Note that you have to actually create the Caches directory there so when writing you have to check and create every time Kind of a pain but that's how it is. Then when you have a writable path..
The simplest way to resize an UIImage? http://stackoverflow.com/questions/2658738/the-simplest-way-to-resize-an-uiimage The simplest way is to set the frame of your UIImageView and set the contentMode to one of the resizing options. Or you can use this utility method if you actually need to resize an image UIImage imageWithImage UIImage image scaledToSize CGSize newSize UIGraphicsBeginImageContext newSize In next line pass 0.0 to use the current..
Starting iPhone app development in Linux? http://stackoverflow.com/questions/276907/starting-iphone-app-development-in-linux
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework results come out as 0.000 that's not an error it's just very very fast This code is really stupidly obscure it is generously commented but the comments don't actually make life any easier. Basically at the heart of it is vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal A stride log2n FFT_INVERSE FFT.. 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 overview explains this packing. it is quite neat basically it allows the..
Can I embed a custom font in an iPhone application? http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application Working on the simulator too would be a bonus. EDIT it appears that the bounty auto awards to the answer with the highest number of votes. Interesting. No one actually provided an answer that solved the question as asked the solution that involves coding your own UILabel subclass doesn't support word wrap which is an essential..
Getting current device language in iOS? http://stackoverflow.com/questions/3910244/getting-current-device-language-in-ios want this as an NSString in fully spelled out format. Not @ en_US iphone objective c ios nslocale share improve this question The solutions provided will actually return the current region of the device not the currently selected language. These are often one and the same. However if I am in North America and I set my language.. quote the header information from NSLocale.h NSArray preferredLanguages NS_AVAILABLE 10_5 2_0 note that this list does not indicate what language the app is actually running in the NSBundle mainBundle object determines that at launch and knows that information People interested in app language take a look at @mindvision's answer..
How to determine the content size of a UIWebView? http://stackoverflow.com/questions/3936041/how-to-determine-the-content-size-of-a-uiwebview is set to a minimal size prior to sending sizeThatFits . After that we can correct the wrong frame size by the fitting size. This sounds terrible but it's actually not that bad. Since we do both frame changes right after each other the view isn't updated and doesn't flicker. Of course we have to wait until the content has..
Get PDF hyperlinks on iOS with Quartz http://stackoverflow.com/questions/4080373/get-pdf-hyperlinks-on-ios-with-quartz that's another story... Update 2 So I finally came up with some working code. I'm posting it here so hopefully it'll help someone. It assumes the PDF document actually contains annotations. for int i 0 i pageCount i CGPDFPageRef page CGPDFDocumentGetPage doc i 1 CGPDFDictionaryRef pageDictionary CGPDFPageGetDictionary page CGPDFArrayRef..
How to capture UIView to UIImage without loss of quality on retina display http://stackoverflow.com/questions/4334233/how-to-capture-uiview-to-uiimage-without-loss-of-quality-on-retina-display argument and you'll get a context with a scale factor equal to that of the screen. UIGraphicsBeginImageContext uses a fixed scale factor of 1.0 so you're actually getting exactly the same image on an iPhone 4 as on the other iPhones. I'll bet either the iPhone 4 is applying a filter when you implicitly scale it up or just..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll code using search with the FRC I would greatly appreciate it iphone search core data uisearchbar uisearchdisplaycontroller share improve this question I actually just implemented this on one of my projects your question and the other wrong answer hinted at what to do . I tried Sergio's answer but had exception issues when.. implemented this on one of my projects your question and the other wrong answer hinted at what to do . I tried Sergio's answer but had exception issues when actually running on a device. Yes you create two fetch results controllers one for the normal display and another one for the UISearchBar's table view. If you only use one..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app button and swipe to home gesture is disabled. If you have seen the iPads in the Apple Store running the smart sign apps then you will know what I mean. It is actually pretty trivial to make this work all you need to do is install a correctly formatted mobile config plist over the air from a web server. To deliver your config..
How do I size a UITextView to its content? http://stackoverflow.com/questions/50467/how-do-i-size-a-uitextview-to-its-content cell and the UITextView it contains expands to hold all lines of text in the notes string. iphone cocoa touch uikit share improve this question There is actually a very easy way to do resizing of the UITextView to its correct height of the content. It can be done using the UITextView contentSize . CGRect frame _textView.frame..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown compiler will not complain about selectors declared statically _controller performSelector @selector someMethod The reason for this is because the compiler actually is able to record all of the information about the selector and the object during compilation. It doesn't need to make any assumptions about anything. I checked..
Syntax help - Variable as object name [duplicate] http://stackoverflow.com/questions/7940809/syntax-help-variable-as-object-name to be a very practical way of referring to data what if you typo a string the compiler won't be able to catch it . I won't get into second guessing what you actually want to do that would depend on the goal of this part of your application but you can use an NSMutableDictionary to get a similar effect NSMutableDictionary dict..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview SDK such as an equivalent of the .NET WebClient openRead Thanks in advance html iphone uiwebview share improve this question The second question is actually easier to answer. Look at the stringWithContentsOfURL encoding error method of NSString it lets you pass in a URL as an instance of NSURL which can easily be instantiated..
How to Rotate a UIImage 90 degrees? http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees clockwise by 90 degrees to landscape . I don't want to use a CGAffineTransform. I want the pixels of the UIImage to actually shift position. I am using a block of code shown below originally intended to resize a UIImage to do this. I set a target..
http://stackoverflow.com/questions/1388467/reading-epub-format is packaged up OEBPS a zip file of everything in the manifest 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 can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone createDirectoryAtPath cachePath withIntermediateDirectories NO attributes nil error error Note that you have to actually create the Caches directory there so when writing you have to check and create every time Kind of a pain but that's how..
The simplest way to resize an UIImage? http://stackoverflow.com/questions/2658738/the-simplest-way-to-resize-an-uiimage of your UIImageView and set the contentMode to one of the resizing options. Or you can use this utility method if you actually need to resize an image UIImage imageWithImage UIImage image scaledToSize CGSize newSize UIGraphicsBeginImageContext newSize..
Starting iPhone app development in Linux? http://stackoverflow.com/questions/276907/starting-iphone-app-development-in-linux
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework error it's just very very fast This code is really stupidly obscure it is generously commented but the comments don't actually make life any easier. Basically at the heart of it is vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD vDSP_fft_zrip setupReal.. 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 overview explains this packing...
Can I embed a custom font in an iPhone application? http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application bonus. EDIT it appears that the bounty auto awards to the answer with the highest number of votes. Interesting. No one actually provided an answer that solved the question as asked the solution that involves coding your own UILabel subclass doesn't..
Getting current device language in iOS? http://stackoverflow.com/questions/3910244/getting-current-device-language-in-ios out format. Not @ en_US iphone objective c ios nslocale share improve this question The solutions provided will actually return the current region of the device not the currently selected language. These are often one and the same. However if.. NSArray preferredLanguages NS_AVAILABLE 10_5 2_0 note that this list does not indicate what language the app is actually running in the NSBundle mainBundle object determines that at launch and knows that information People interested in app..
How to determine the content size of a UIWebView? http://stackoverflow.com/questions/3936041/how-to-determine-the-content-size-of-a-uiwebview sizeThatFits . After that we can correct the wrong frame size by the fitting size. This sounds terrible but it's actually not that bad. Since we do both frame changes right after each other the view isn't updated and doesn't flicker. Of course..
How to capture UIView to UIImage without loss of quality on retina display http://stackoverflow.com/questions/4334233/how-to-capture-uiview-to-uiimage-without-loss-of-quality-on-retina-display a scale factor equal to that of the screen. UIGraphicsBeginImageContext uses a fixed scale factor of 1.0 so you're actually getting exactly the same image on an iPhone 4 as on the other iPhones. I'll bet either the iPhone 4 is applying a filter..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll greatly appreciate it iphone search core data uisearchbar uisearchdisplaycontroller share improve this question I actually just implemented this on one of my projects your question and the other wrong answer hinted at what to do . I tried Sergio's.. your question and the other wrong answer hinted at what to do . I tried Sergio's answer but had exception issues when actually running on a device. Yes you create two fetch results controllers one for the normal display and another one for the UISearchBar's..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app If you have seen the iPads in the Apple Store running the smart sign apps then you will know what I mean. It is actually pretty trivial to make this work all you need to do is install a correctly formatted mobile config plist over the air from..
How do I size a UITextView to its content? http://stackoverflow.com/questions/50467/how-do-i-size-a-uitextview-to-its-content to hold all lines of text in the notes string. iphone cocoa touch uikit share improve this question There is actually a very easy way to do resizing of the UITextView to its correct height of the content. It can be done using the UITextView..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown declared statically _controller performSelector @selector someMethod The reason for this is because the compiler actually is able to record all of the information about the selector and the object during compilation. It doesn't need to make any..
Reading HTML content from a UIWebView http://stackoverflow.com/questions/992348/reading-html-content-from-a-uiwebview WebClient openRead Thanks in advance html iphone uiwebview share improve this question The second question is actually easier to answer. Look at the stringWithContentsOfURL encoding error method of NSString it lets you pass in a URL as an..
How do I record audio on iPhone with AVAudioRecorder? http://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder for a simple sample to get me started. Thanks in advance. iphone audio recording share improve this question Actually there are no examples at all. Here is my working code. Recording is triggered by the user pressing a button on the navBar...
iPhone board game: OpenGL ES or CoreGraphics? [closed] http://stackoverflow.com/questions/1082511/iphone-board-game-opengl-es-or-coregraphics What do most games of this type on the App Store use iphone opengl es core graphics share improve this question Actually what I'd suggest in this case is Core Animation or even just UIViews themselves. If you do direct drawing of all of your..
Can we run Java applictions on iPhone? http://stackoverflow.com/questions/1193524/can-we-run-java-applictions-on-iphone we run Java applictions on iPhone Can we run or develop apps for iPhone in Java Actually I am a bit confused... Please bear with me have a look to these links and answer LINK 1 LINK 2 LINK 3 This is an Open discussion...
Is there an easy way or library available to let text glow? http://stackoverflow.com/questions/1229721/is-there-an-easy-way-or-library-available-to-let-text-glow available to let text glow I'd like to make a glowing text that looks like if it was shining or emmitting light. Actually this would be done with some blurryness in the background. But I've found nothing in the iPhone SDK that would do it. iphone..
How to merge conflicts (file project.pbxproj) in Xcode use svn? http://stackoverflow.com/questions/2004135/how-to-merge-conflicts-file-project-pbxproj-in-xcode-use-svn I select quit Xcode and manual merge the conflicts. Then I start to edit my project.pbxproj merge our changes. Actually I don't konw how Xcode manage files I just add some text that my project.pbxproj file did't had. When I finish it my project..
How to change the blue highlight color of a UITableViewCell? http://stackoverflow.com/questions/2553746/how-to-change-the-blue-highlight-color-of-a-uitableviewcell If you change it to UITableViewCellSelectionStyleGray it will be gray. Change the selectedBackgroundView property. Actually what creates the blue gradient is a view. You can create a view and draw what ever you like and use the view as the background..
Push Notification in Iphone application [closed] http://stackoverflow.com/questions/2558645/push-notification-in-iphone-application Notification in Iphone application closed I need to implement push notification in my application. Actually i have to receive messages from the server. Kindly guide me how i can implement push notifications in my iphone application...
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework 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 'DC Offset'. It so happens that Bin 0 and Bin n 2 will always..
Editing a UITextField inside a UITableViewCell fails http://stackoverflow.com/questions/376372/editing-a-uitextfield-inside-a-uitableviewcell-fails suggestion I tried building my application using the 2.0 2.1 and 2.2 SDKs. I got the same behaviour in all versions. Actually something related but not the same broke in 2.2 but that's probably another question iphone cocoa touch share improve..
MPMoviePlayerController vs. MPMoviePlayerViewController http://stackoverflow.com/questions/4056844/mpmovieplayercontroller-vs-mpmovieplayerviewcontroller this class just happens to be named MPMoviePlayerController because it gives you control over the movie player. Actually before 4.0 i think there was no view controller and just the movie player later apple decided to incorporate the movie player..
MPMoviePlayerController and HTTP Live Streaming http://stackoverflow.com/questions/4302383/mpmovieplayercontroller-and-http-live-streaming MPMovieSourceTypeStreaming mp setFullscreen YES self.view addSubview mp view mp prepareToPlay mp play Actually the controller recieves MPMoviePlayerPlaybackDidFinishNotification without playing anything. Where is the problem iphone..
Monitor memory usage in an iphone app? http://stackoverflow.com/questions/4579642/monitor-memory-usage-in-an-iphone-app it possible to monitor the amount of memory your app is consuming iphone objective c share improve this question Actually it's probably more important you know how much memory is free rather than how much your app is using. Here's some code to..
iOS: Using device modifiers for loading xib files? http://stackoverflow.com/questions/5191472/ios-using-device-modifiers-for-loading-xib-files things listed above are 4.0 minimum. iphone objective c cocoa touch ipad ios share improve this question Actually it is explicitly defined in the docs but as a footnote. CocoaNibs In the note at the bottom of Loading NIB files using NSBundle..
UIPicker sizing in landscape mode http://stackoverflow.com/questions/535164/uipicker-sizing-in-landscape-mode the size of UIPicker. Thank you very much for your help. iphone cocoa touch landscape share improve this question Actually I resize my pickers for almost every app. I do not like that they take up the entire screen. Here is the method that I am..
http://stackoverflow.com/questions/6942439/objectivec-ivars-or-property when we set @property cocoa creates some setters getters which are handling the relasing and retaining of the objects. Actually no. The @property just declares a property. In order to automatically generate the getter and setter you need to @synthesize..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown 1 All Objective C methods have two hidden arguments self and _cmd that are implicitly added when you call a method. 2 Actually it's possible for it to get the wrong info if declare you objects as id and you're not importing all headers. You could..
Most efficient way to draw part of an image in iOS http://stackoverflow.com/questions/8035673/most-efficient-way-to-draw-part-of-an-image-in-ios mentioned UIImageView . And optimization problems always need defining specifically. Trust Apple for Regular UI stuff Actually UIImageView with clipsToBounds is one of the fastest simplest ways to archive your goal if your goal is just clipping a..
Way to make a UIButton continuously fire during a press-and-hold situation? http://stackoverflow.com/questions/903114/way-to-make-a-uibutton-continuously-fire-during-a-press-and-hold-situation for a UIButton If not is this possible to do with a UIImageView by overriding a touch handling method in a certain way Actually before trying to do get this done with UIButton I had some UIImageViews Arranged to function as a D Pad that were checked..
How do you shrink a UIPickerView on the iPhone? http://stackoverflow.com/questions/905969/how-do-you-shrink-a-uipickerview-on-the-iphone How do you shrink a UIPickerView iphone ios interface builder uipickerview picker share improve this question Actually you can slightly shrink the whole UIPickerView by applying an affine transform to an enclosing view. For example CGSize..
Ajax https call in ios using PhoneGap not working? http://stackoverflow.com/questions/9276643/ajax-https-call-in-ios-using-phonegap-not-working https call in ios using PhoneGap not working I could not able to do https POST call using ajax from ipad iphone. Actually I am trying to call this in my PhoneGap application. Could you please help me in this regard. iphone ios ajax cordova cross..
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