2014/10/15 下午 10:09:31
iphone Programming Glossary: generallyiOS Image Orientation has Strange Behavior http://stackoverflow.com/questions/10600613/ios-image-orientation-has-strange-behavior and discovered every image file has metadata property. If the metadata specifies the orientation of the image which is generally ignored by other OS but Mac. Most of images taken are having their meta data property set to right angle. So Mac shows it..
http://stackoverflow.com/questions/12768109/how-to-use-ldid executable on your Mac after building without signing in Xcode but before you upload to your iPhone. Newer phones can generally run executables built for older architectures but not the other way around. So build for the oldest architecture you want..
Drawing incrementally in a UIView (iPhone) http://stackoverflow.com/questions/1798414/drawing-incrementally-in-a-uiview-iphone you are only actually changing a small portion of the UIView's content every time you draw and the rest of the content generally stays the same you can use this. Rather than redraw all the content of the UIView every single time you can mark only the..
http://stackoverflow.com/questions/230984/compression-api-on-the-iphone share improve this question zlib and bzip2 are available. And you can always add others as long as they'll generally compile under OS X. bzip2 is a better choice for smallest file sizes but requires much more CPU power to compress and decompress...
How can I customize an iOS alert view? http://stackoverflow.com/questions/2600779/how-can-i-customize-an-ios-alert-view cocoa touch share improve this question I set up my own UIViewController which I can skin with my own images. I generally only use one or two buttons so I hide the second button if it's not being used. The view is actually the size of the entire..
ApplicationWillTerminate in iOS 4.0 http://stackoverflow.com/questions/3139588/applicationwillterminate-in-ios-4-0 application cannot request additional background execution time from this method. So yes applicationWillTerminate will generally not be called very often in iOS 4. If you have to save data you should do so in both applicationWillTerminate and applicationDidEnterBackground..
Bootstrap Server Error in Xcode IPHONE [duplicate] http://stackoverflow.com/questions/3905718/bootstrap-server-error-in-xcode-iphone to changes in code. ERROR Couldn't register com.yourcompany. with the bootstrap server.Error unknown error code. This generally means that another instance of this process was already running or is hung in the debugger. What could be wrong Please give..
iPhone Development - XMLParser vs. libxml2 vs. TouchXML http://stackoverflow.com/questions/406811/iphone-development-xmlparser-vs-libxml2-vs-touchxml memory usually with a single call and then you can freely explore the XML document from the presented API. This is generally much easier to work with as you get random access to the entire xml document. So the first question one should answer is..
Most effective way to do networking on Mac/iPhone? http://stackoverflow.com/questions/4269613/most-effective-way-to-do-networking-on-mac-iphone display this status. However my current application is just what made me ask the question I'm wondering what people generally do. When I last seriously worked with VB6 about 7 8 years ago WinSock ActiveX control did things a bit different than what..
NSMutableString as retain/copy http://stackoverflow.com/questions/4995254/nsmutablestring-as-retain-copy dealing with tightly coupled objects. tightly coupled objects are those which are basically co dependent and not generally reusable in other contexts. that concept's fine you may just be using a private class for several reasons. in either case.. clients and subclasses is not implicitly clear and the implementation is dangerous. sharing an NSMutableString is generally a bad design. NSMutableString is not thread safe. it makes no sense for clients to access and mutate the string it's dangerous... with care. sharing in this case also extends to subclass usage so make it @private wherever possible retain is also generally a bad design the clients are not going to know when the string's been or is being modified externally unless you add equivalent..
Am I abusing UIViewController Subclassing? http://stackoverflow.com/questions/5691226/am-i-abusing-uiviewcontroller-subclassing UIViewController subclasses. In fact I thought this was more or less the whole idea of Apple's implementation of MVC generally... One overall VC with other VCs beneath all happily getting their delegate methods called. If there are a lot of views.. a container view controller is a somewhat advanced topic you should be very familiar with the use of view controllers generally and the way the provided container view controllers work before you take a stab at creating your own. share improve this..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space centers. So you're interested in the texture coordinates 0 8 1 8 2 1 2 8 1 8 2 8 2 3 2 8 ... 7 8 8 8 2 15 2 8 Or more generally for pixel i in a N wide texture the proper texture coordinate is 2i 1 2N However if you want to perfectly align your texture..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature aren't going to fix it. The circumvention is apparently to set the locale of the date formatter for a specific region generally the US but this is a bit messy NSLocale loc NSLocale alloc initWithLocaleIdentifier @ en_US df setLocale loc loc release..
Scrolling with two fingers with a UIScrollView http://stackoverflow.com/questions/787212/scrolling-with-two-fingers-with-a-uiscrollview and make two finger events scroll the scroll view may be easy may be hard may be impossible . Patrick's suggestion is generally fine let your UIScrollView subclass know about your content view then in touch event handlers check the number of fingers..
iPhone - strange error when testing on simulator http://stackoverflow.com/questions/788277/iphone-strange-error-when-testing-on-simulator this error in the console Couldn't register com.myApp.debug with the bootstrap server. Error unknown error code. This generally means that another instance of this process was already running or is hung in the debugger.Program received signal �SIGABRT..
Why is object not dealloc'ed when using ARC + NSZombieEnabled http://stackoverflow.com/questions/8408071/why-is-object-not-dealloced-when-using-arc-nszombieenabled something special wrt an object when using ARC NSZombieEnabled so it would solve this specific example and also apply generally to a project as a whole w o leaving the potential for other similar problems. It is entirely possible that a good answer..
MKMapView: Instead of Annotation Pin, a custom view http://stackoverflow.com/questions/9814988/mkmapview-instead-of-annotation-pin-a-custom-view of an MKPinAnnotationView . MKPinAnnotationView is a subclass of MKAnnotationView so it has an image property but it generally overrides that and draws a pin image that's what it's for . So change the code to MKAnnotationView mapView MKMapView mV..
http://stackoverflow.com/questions/1059101/font-size-in-pixels pixels per point. Just remember that every glyph varies in height and width so this is a very rough estimate of size. Generally the distance between baselines will be a bit larger than the font's point size so that lines of text don't crash into each..
How to use Shake API in iPhone SDK 3.0? http://stackoverflow.com/questions/1170917/how-to-use-shake-api-in-iphone-sdk-3-0 UIEventSubtype motion withEvent UIEvent event void motionEnded UIEventSubtype motion withEvent UIEvent event Generally you just implement this void motionEnded UIEventSubtype motion withEvent UIEvent event if event.type UIEventSubtypeMotionShake..
How to add a right button to a UINavigationController? http://stackoverflow.com/questions/1219779/how-to-add-a-right-button-to-a-uinavigationcontroller self iphone ios uinavigationcontroller uinavigationbar share improve this question Try doing it in viewDidLoad. Generally you should defer anything you can until that point anyway when a UIViewController is inited it still might be quite a while..
iOS 6 - viewDidUnload migrate to didReceiveMemoryWarning? http://stackoverflow.com/questions/12674268/ios-6-viewdidunload-migrate-to-didreceivememorywarning And you most certainly do not want to simply migrate all of the contents of viewDidUnload to didReceiveMemoryWarning . Generally most of us do the setting of IBOutlet references to nil in viewDidUnload largely because Interface Builder would put that..
When is UIViewController viewDidUnload called? http://stackoverflow.com/questions/1285932/when-is-uiviewcontroller-viewdidunload-called if you've retained some IBOutlets to help free up memory that would otherwise be released by the view being unloaded . Generally any IBOutlets you release in dealloc should also be released and references set to nil in this method. share improve this..
iPhone 5 Optimization Requirement - Launch image really necessary? http://stackoverflow.com/questions/16552348/iphone-5-optimization-requirement-launch-image-really-necessary as your app is ready for use your app displays its first screen replacing the launch placeholder image. Furthermore Generally design a launch image that is identical to the first screen of the app. So really making a launch image that is about the..
How to create a UIScrollView of infinite scrolling? http://stackoverflow.com/questions/1845789/how-to-create-a-uiscrollview-of-infinite-scrolling this question It's very easy somewhat tricky... You don't need to define the specific size for the ScrollView..... Generally we use to define ....as per the Examples of Apple #define SCROLLVIEW_CONTENT_HEIGHT 460 #define SCROLLVIEW_CONTENT_WIDTH..
http://stackoverflow.com/questions/2135744/iphone-uiimageview-pinch-zoom 'read the documentation on xyz' would be appreciated Thanks in advance. iphone share improve this question Generally speaking whenever you implement a continuous UI behavior you need to measure it against something that does not change...
About download file using ASIHttpRequest http://stackoverflow.com/questions/3341658/about-download-file-using-asihttprequest
How to implement a cyclic UIScrollView? http://stackoverflow.com/questions/3421269/how-to-implement-a-cyclic-uiscrollview a new right. If you detect that you moved left you free right make right current current left and make a new left. Generally speaking any view that is more than one page away from current is not required. So you need only three pages in total. Of..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints tiles can be seen rendering even with a tileSize tweak CALayers cant be prepared ahead of time rendered off screen . Generally PDF viewers are pretty heavy on memory too. Even monitor the memory usage of apple's zoomable PDF example. In my current..
Monotouch binding for TouchJSON? http://stackoverflow.com/questions/4271126/monotouch-binding-for-touchjson AdMob library cannot find the CJSONDeserializer or CJSONSerializer classes which I presume come from libTouchJSON.a. Generally this means that your libTouchJSON.a wasn't included in your project. You should double check all your extra arguments and..
How do I reset after a UIScrollView zoom? http://stackoverflow.com/questions/448285/how-do-i-reset-after-a-uiscrollview-zoom atScale will be called and give you a chance to do a more high quality rendering of your view at the new scale factor. Generally it's suggested that you reset the transform on your view to be CGAffineTransformIdentity and then have your view manually..
Is there a way to convert an iOS app to a Mac OS X app? http://stackoverflow.com/questions/4714063/is-there-a-way-to-convert-an-ios-app-to-a-mac-os-x-app osx ios app store share improve this question It's a very broad question and as such is very difficult to answer. Generally the answer would have to be no. For an app if you strictly followed the MVC model you'd be able to keep the model but would..
What are the key concepts for an iPhone Developer to learn? [closed] http://stackoverflow.com/questions/5677655/what-are-the-key-concepts-for-an-iphone-developer-to-learn release or autorelease . A note about autorelease People often have trouble with understanding autorelease . Generally speaking local autoreleased objects are guaranteed to be around until the end of method call. No more no less. Of course..
Checkbox in IPhone application http://stackoverflow.com/questions/650131/checkbox-in-iphone-application in IPhone SDK. How do I do this. Give me some ideas plz. Thanks in advance iphone share improve this question Generally you would use the UISwitch for checkbox like functionality. You could roll your own though by using an image control with..
If I use the PayPal gateway in my iPhone app, will Apple approve it? [closed] http://stackoverflow.com/questions/7005929/if-i-use-the-paypal-gateway-in-my-iphone-app-will-apple-approve-it the PayPal gateway in my iPhone app will Apple approve it iphone ios paypal app store share improve this question Generally speaking yes your app will be rejected. According to section 11.2 of the App Store Review Guidelines for iOS Login Required..
Where we have to store download data in iPhone application? http://stackoverflow.com/questions/7963484/where-we-have-to-store-download-data-in-iphone-application tmp Use this directory to write temporary files that do not need to persist between launches of your application. Generally this means that anything that is not intended to be seen by the user should go into a directory inside the Library directory...
What's the difference between GLKView and EAGLView? http://stackoverflow.com/questions/8412302/whats-the-difference-between-glkview-and-eaglview OpenGL ES content. Others have copied and pasted these classes in the tutorials they've written about the subject. Generally the one element all of the classes with this name have in common is that they override the layerClass method to return CAEAGLLayer..
Reducing piracy of iPhone applications http://stackoverflow.com/questions/846309/reducing-piracy-of-iphone-applications NSBundle mainBundle NSDictionary info bundle infoDictionary if info objectForKey @ SignerIdentity nil do something Generally we don't have SignerIdentity in any of the App Store applications we build so checking for nil then performing set instructions..
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