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2014/10/15 ¤U¤È 10:03:30
iphone Programming Glossary: addingHow to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present I'm working with is brought up by a tabbar UITabBar which needs to function as normal. Edit I am adding the scroll bar just for when the keyboard comes up. Even though it's not needed I feel like it provides.. will need a scroll view if the contents you have now does not fit in the iPhone screen. If you are adding the scroll view just to make the textfield scroll up when keyboard comes up then it's not needed. For..
How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an this question Brief Description Just another approach to complete the answer of JBRWilkinson but adding some code. It can also offers a solution to Alex Reynolds's comment. Use NSCalendar method NSDateComponents..
UIImagePickerController and extracting EXIF data from existing photos http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos scanImageData jpegData EXFMetaData exifMetaData jpegScanner.exifMetaData end of helper methods adding GPS data to the Exif object NSMutableArray locArray self createLocArray imageLocation.coordinate.latitude..
Get to UIViewController from UIView on iPhone? http://stackoverflow.com/questions/1340434/get-to-uiviewcontroller-from-uiview-on-iphone the view controller is achieved There is no built in way to do it. While you can get around it by adding a IBOutlet on the UIView and connecting these in Interface Builder this is not recommended. The view..
http://stackoverflow.com/questions/1861656/iphone-reachability-checking and buying the dvd were not main features. Nothing else required internet access. Instead of adding more code we just set the background of both internet views to a notice telling the users they must..
Grid view in iPhone SDK [closed] http://stackoverflow.com/questions/2265293/grid-view-in-iphone-sdk . I know that the iPhone 3.2 SDK is under NDA but is there a library or framework available for adding this kind of functionality non SDK . Ideally I would like to eventually develop an iPad version of the..
Cocoa Graphing/Plotting Framework that Works on iPhoneOS [closed] http://stackoverflow.com/questions/263472/cocoa-graphing-plotting-framework-that-works-on-iphoneos Graphing Plotting Framework that Works on iPhoneOS closed Looking at adding some data graphing to a new iPhone app in development ala the Stocks app . I realize I could buckle..
iPhone Safari Web App opens links in new window http://stackoverflow.com/questions/2898740/iphone-safari-web-app-opens-links-in-new-window Safari Web App opens links in new window I have problem with web after adding icon to Home Screen. If the web is launched from Home Screen all links will open in new window in Safari..
Setting direction for UISwipeGestureRecognizer http://stackoverflow.com/questions/3319209/setting-direction-for-uiswipegesturerecognizer void handleSwipeFrom UISwipeGestureRecognizer recognizer NSLog @ Swipe received. I fixed this with adding four recognizers to the view but I'm curious to know why didn't it work as advertised in docs void viewDidLoad..
HTML5 inline video on iPhone vs iPad/Browser http://stackoverflow.com/questions/3699552/html5-inline-video-on-iphone-vs-ipad-browser me saying very simply that I should add webkit playsinline to the video tag on the HTML as well as adding the allowsInlineMediaPlayback property on the UIWebView. So in the end this is what it looks like HTML..
http://stackoverflow.com/questions/37464/iphone-app-minus-app-store your application onto up to 100 devices. The developer program has the details but it involves adding UUIDs for each of the devices to your application package. UUIDs can be easiest retrieved using Ad Hoc..
iVar property, access via self? http://stackoverflow.com/questions/4088801/ivar-property-access-via-self self setThisValue @ a rather than thisValue @ a However with the example below I can see that adding self documents that I am sending a message to an iVar property rather than a locally scoped variable..
“Warning: iPhone apps should include an armv6 architecture” even with build config set http://stackoverflow.com/questions/4198676/warning-iphone-apps-should-include-an-armv6-architecture-even-with-build-conf generating errors. If it still doesn't work see this answer from justinxreese which suggests adding entries for armv6 and armv7 under Required Device Capabilities in your info.plist file. share improve..
Return to app behavior after phone call different in native code than UIWebView http://stackoverflow.com/questions/5317783/return-to-app-behavior-after-phone-call-different-in-native-code-than-uiwebview tel URL handling behavior. Instead just load a tel URL request in an instance of UIWebView without adding it to your view hierarchy. For example #import Foundation Foundation.h #import UIKit UIKit.h @interface..
Xcode 4 failure to symbolicate Crash Log http://stackoverflow.com/questions/5458573/xcode-4-failure-to-symbolicate-crash-log cocoa touch xcode debugging adhoc share improve this question Further to coob's answer I find adding these directories to Spotlight's ignore list System Preferences &rarr Spotlight &rarr Privacy helps..
Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK? http://stackoverflow.com/questions/7760946/is-it-possible-to-target-older-ios-versions-when-using-xcode-4-2-and-ios-5-sdk up to date. I have quit and restarted xcode I have cleaned the build multiple times. I have tried adding armv6 in the archtecture build settings but nothing will allow me to build and run my app on my old..
Having trouble adding objects to NSMutableArray in Objective C http://stackoverflow.com/questions/851926/having-trouble-adding-objects-to-nsmutablearray-in-objective-c trouble adding objects to NSMutableArray in Objective C I am using the iPhone SDK and have an issue doing something.. simple. I am trying to add an NSNumber object to an NSMutableArray instance variable. I tried adding NSNumber card to NSMutableArray viewedCardsArray however without breaking it does not get added to the..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 application which was only made available at WWDC 2011 . I start by configuring my AVAssetWriter adding an input and configuring a pixel buffer input. The following code is used to set up the pixel buffer..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present code for what needs it. Note the UIView or UIScrollView that I'm working with is brought up by a tabbar UITabBar which needs to function as normal. Edit I am adding the scroll bar just for when the keyboard comes up. Even though it's not needed I feel like it provides a better interface because then the user can scroll and.. iphone objective c ios share improve this question You will need a scroll view if the contents you have now does not fit in the iPhone screen. If you are adding the scroll view just to make the textfield scroll up when keyboard comes up then it's not needed. For showing the textfields without being hidden by the keyboard..
How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an can you iphone cocoa time nstimeinterval share improve this question Brief Description Just another approach to complete the answer of JBRWilkinson but adding some code. It can also offers a solution to Alex Reynolds's comment. Use NSCalendar method NSDateComponents components NSUInteger unitFlags fromDate NSDate startingDate..
UIImagePickerController and extracting EXIF data from existing photos http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos image 0.8 EXFJpeg jpegScanner EXFJpeg alloc init jpegScanner scanImageData jpegData EXFMetaData exifMetaData jpegScanner.exifMetaData end of helper methods adding GPS data to the Exif object NSMutableArray locArray self createLocArray imageLocation.coordinate.latitude EXFGPSLoc gpsLoc EXFGPSLoc alloc init self populateGPS..
Get to UIViewController from UIView on iPhone? http://stackoverflow.com/questions/1340434/get-to-uiviewcontroller-from-uiview-on-iphone this neither the rest of the answers where direct access to the view controller is achieved There is no built in way to do it. While you can get around it by adding a IBOutlet on the UIView and connecting these in Interface Builder this is not recommended. The view should not know about the view controller. Instead you should..
http://stackoverflow.com/questions/1861656/iphone-reachability-checking features that required internet access entering the sweepstakes and buying the dvd were not main features. Nothing else required internet access. Instead of adding more code we just set the background of both internet views to a notice telling the users they must be connected to the internet to use this feature. It was in..
Grid view in iPhone SDK [closed] http://stackoverflow.com/questions/2265293/grid-view-in-iphone-sdk in my iPhone app similar to that shown in the iPad photos app . I know that the iPhone 3.2 SDK is under NDA but is there a library or framework available for adding this kind of functionality non SDK . Ideally I would like to eventually develop an iPad version of the app where the grid would be 3 items wide in portrait and..
Cocoa Graphing/Plotting Framework that Works on iPhoneOS [closed] http://stackoverflow.com/questions/263472/cocoa-graphing-plotting-framework-that-works-on-iphoneos Graphing Plotting Framework that Works on iPhoneOS closed Looking at adding some data graphing to a new iPhone app in development ala the Stocks app . I realize I could buckle down and do some Quartz drawing but I'm hoping that someone..
iPhone Safari Web App opens links in new window http://stackoverflow.com/questions/2898740/iphone-safari-web-app-opens-links-in-new-window Safari Web App opens links in new window I have problem with web after adding icon to Home Screen. If the web is launched from Home Screen all links will open in new window in Safari and lose full screen functionality . How can I prevent..
Setting direction for UISwipeGestureRecognizer http://stackoverflow.com/questions/3319209/setting-direction-for-uiswipegesturerecognizer recognizer recognizer release super viewDidLoad void handleSwipeFrom UISwipeGestureRecognizer recognizer NSLog @ Swipe received. I fixed this with adding four recognizers to the view but I'm curious to know why didn't it work as advertised in docs void viewDidLoad UISwipeGestureRecognizer recognizer recognizer UISwipeGestureRecognizer..
HTML5 inline video on iPhone vs iPad/Browser http://stackoverflow.com/questions/3699552/html5-inline-video-on-iphone-vs-ipad-browser a bug with Apple. After a couple of weeks they got back to me saying very simply that I should add webkit playsinline to the video tag on the HTML as well as adding the allowsInlineMediaPlayback property on the UIWebView. So in the end this is what it looks like HTML video id player width 480 height 320 webkit playsinline Obj..
http://stackoverflow.com/questions/37464/iphone-app-minus-app-store developer program. You can then use the adhoc system to install your application onto up to 100 devices. The developer program has the details but it involves adding UUIDs for each of the devices to your application package. UUIDs can be easiest retrieved using Ad Hoc Helper available from the App Store. For further details..
iVar property, access via self? http://stackoverflow.com/questions/4088801/ivar-property-access-via-self accessing setter getter methods for properties I should be using self setThisValue @ a rather than thisValue @ a However with the example below I can see that adding self documents that I am sending a message to an iVar property rather than a locally scoped variable but does it do anything else in this case @interface CustomController..
“Warning: iPhone apps should include an armv6 architecture” even with build config set http://stackoverflow.com/questions/4198676/warning-iphone-apps-should-include-an-armv6-architecture-even-with-build-conf
Return to app behavior after phone call different in native code than UIWebView http://stackoverflow.com/questions/5317783/return-to-app-behavior-after-phone-call-different-in-native-code-than-uiwebview you don't have to actually display the UIWebView to get its tel URL handling behavior. Instead just load a tel URL request in an instance of UIWebView without adding it to your view hierarchy. For example #import Foundation Foundation.h #import UIKit UIKit.h @interface PhoneCaller NSObject @private UIWebView webview void callTelURL..
Xcode 4 failure to symbolicate Crash Log http://stackoverflow.com/questions/5458573/xcode-4-failure-to-symbolicate-crash-log I can't find the dSym files for these AdHoc builds. iphone cocoa touch xcode debugging adhoc share improve this question Further to coob's answer I find adding these directories to Spotlight's ignore list System Preferences &rarr Spotlight &rarr Privacy helps ~ Library Developer Xcode DerivedData Xcode 4 build artefacts..
Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK? http://stackoverflow.com/questions/7760946/is-it-possible-to-target-older-ios-versions-when-using-xcode-4-2-and-ios-5-sdk or higher. I have all my provisioning profiles installed and up to date. I have quit and restarted xcode I have cleaned the build multiple times. I have tried adding armv6 in the archtecture build settings but nothing will allow me to build and run my app on my old phone with ios 4.2.1. My question is is it possible to still..
Having trouble adding objects to NSMutableArray in Objective C http://stackoverflow.com/questions/851926/having-trouble-adding-objects-to-nsmutablearray-in-objective-c trouble adding objects to NSMutableArray in Objective C I am using the iPhone SDK and have an issue doing something simple. I am trying to add an NSNumber object to an NSMutableArray.. C I am using the iPhone SDK and have an issue doing something simple. I am trying to add an NSNumber object to an NSMutableArray instance variable. I tried adding NSNumber card to NSMutableArray viewedCardsArray however without breaking it does not get added to the array. Here is the code. Inside the header file Class.h..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 article on the subject and Apple's ChromaKey sample application which was only made available at WWDC 2011 . I start by configuring my AVAssetWriter adding an input and configuring a pixel buffer input. The following code is used to set up the pixel buffer input NSDictionary sourcePixelBufferAttributesDictionary NSDictionary..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present or UIScrollView that I'm working with is brought up by a tabbar UITabBar which needs to function as normal. Edit I am adding the scroll bar just for when the keyboard comes up. Even though it's not needed I feel like it provides a better interface.. this question You will need a scroll view if the contents you have now does not fit in the iPhone screen. If you are adding the scroll view just to make the textfield scroll up when keyboard comes up then it's not needed. For showing the textfields..
UIImagePickerController and extracting EXIF data from existing photos http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos alloc init jpegScanner scanImageData jpegData EXFMetaData exifMetaData jpegScanner.exifMetaData end of helper methods adding GPS data to the Exif object NSMutableArray locArray self createLocArray imageLocation.coordinate.latitude EXFGPSLoc gpsLoc..
Get to UIViewController from UIView on iPhone? http://stackoverflow.com/questions/1340434/get-to-uiviewcontroller-from-uiview-on-iphone direct access to the view controller is achieved There is no built in way to do it. While you can get around it by adding a IBOutlet on the UIView and connecting these in Interface Builder this is not recommended. The view should not know about..
http://stackoverflow.com/questions/1861656/iphone-reachability-checking entering the sweepstakes and buying the dvd were not main features. Nothing else required internet access. Instead of adding more code we just set the background of both internet views to a notice telling the users they must be connected to the..
Grid view in iPhone SDK [closed] http://stackoverflow.com/questions/2265293/grid-view-in-iphone-sdk in the iPad photos app . I know that the iPhone 3.2 SDK is under NDA but is there a library or framework available for adding this kind of functionality non SDK . Ideally I would like to eventually develop an iPad version of the app where the grid..
Cocoa Graphing/Plotting Framework that Works on iPhoneOS [closed] http://stackoverflow.com/questions/263472/cocoa-graphing-plotting-framework-that-works-on-iphoneos Graphing Plotting Framework that Works on iPhoneOS closed Looking at adding some data graphing to a new iPhone app in development ala the Stocks app . I realize I could buckle down and do some Quartz..
iPhone Safari Web App opens links in new window http://stackoverflow.com/questions/2898740/iphone-safari-web-app-opens-links-in-new-window Safari Web App opens links in new window I have problem with web after adding icon to Home Screen. If the web is launched from Home Screen all links will open in new window in Safari and lose full screen..
Setting direction for UISwipeGestureRecognizer http://stackoverflow.com/questions/3319209/setting-direction-for-uiswipegesturerecognizer super viewDidLoad void handleSwipeFrom UISwipeGestureRecognizer recognizer NSLog @ Swipe received. I fixed this with adding four recognizers to the view but I'm curious to know why didn't it work as advertised in docs void viewDidLoad UISwipeGestureRecognizer..
HTML5 inline video on iPhone vs iPad/Browser http://stackoverflow.com/questions/3699552/html5-inline-video-on-iphone-vs-ipad-browser they got back to me saying very simply that I should add webkit playsinline to the video tag on the HTML as well as adding the allowsInlineMediaPlayback property on the UIWebView. So in the end this is what it looks like HTML video id player width..
http://stackoverflow.com/questions/37464/iphone-app-minus-app-store adhoc system to install your application onto up to 100 devices. The developer program has the details but it involves adding UUIDs for each of the devices to your application package. UUIDs can be easiest retrieved using Ad Hoc Helper available..
iVar property, access via self? http://stackoverflow.com/questions/4088801/ivar-property-access-via-self I should be using self setThisValue @ a rather than thisValue @ a However with the example below I can see that adding self documents that I am sending a message to an iVar property rather than a locally scoped variable but does it do anything..
“Warning: iPhone apps should include an armv6 architecture” even with build config set http://stackoverflow.com/questions/4198676/warning-iphone-apps-should-include-an-armv6-architecture-even-with-build-conf
Return to app behavior after phone call different in native code than UIWebView http://stackoverflow.com/questions/5317783/return-to-app-behavior-after-phone-call-different-in-native-code-than-uiwebview to get its tel URL handling behavior. Instead just load a tel URL request in an instance of UIWebView without adding it to your view hierarchy. For example #import Foundation Foundation.h #import UIKit UIKit.h @interface PhoneCaller NSObject..
Xcode 4 failure to symbolicate Crash Log http://stackoverflow.com/questions/5458573/xcode-4-failure-to-symbolicate-crash-log builds. iphone cocoa touch xcode debugging adhoc share improve this question Further to coob's answer I find adding these directories to Spotlight's ignore list System Preferences &rarr Spotlight &rarr Privacy helps ~ Library Developer..
Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK? http://stackoverflow.com/questions/7760946/is-it-possible-to-target-older-ios-versions-when-using-xcode-4-2-and-ios-5-sdk installed and up to date. I have quit and restarted xcode I have cleaned the build multiple times. I have tried adding armv6 in the archtecture build settings but nothing will allow me to build and run my app on my old phone with ios 4.2.1...
Having trouble adding objects to NSMutableArray in Objective C http://stackoverflow.com/questions/851926/having-trouble-adding-objects-to-nsmutablearray-in-objective-c trouble adding objects to NSMutableArray in Objective C I am using the iPhone SDK and have an issue doing something simple. I am trying.. an issue doing something simple. I am trying to add an NSNumber object to an NSMutableArray instance variable. I tried adding NSNumber card to NSMutableArray viewedCardsArray however without breaking it does not get added to the array. Here is the..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 ChromaKey sample application which was only made available at WWDC 2011 . I start by configuring my AVAssetWriter adding an input and configuring a pixel buffer input. The following code is used to set up the pixel buffer input NSDictionary..
iPhone: How to draw line between two points on MapKit? http://stackoverflow.com/questions/10598322/iphone-how-to-draw-line-between-two-points-on-mapkit northEastPoint.y southWestPoint.y free pointArr Display PoluLine self.mapView addOverlay self.routeLine Adding the overlay alone will not render anything on the map. Your MKMapViewDelegate implementation must return an overlay for..
Adding Core Data to existing iPhone project http://stackoverflow.com/questions/2032818/adding-core-data-to-existing-iphone-project Core Data to existing iPhone project I'd like to add core data to an existing iPhone project but I still get a lot of compile..
http://stackoverflow.com/questions/2247647/offset-on-uiwindow-addsubview running out of ideas here. Any suggestions how to track this down iphone cocoa touch share improve this question Adding the root view to your UIWindow can be complicated since the window always underlaps the status bar. The frame of your root..
Adding C++ Object to Objective-C Class http://stackoverflow.com/questions/2262011/adding-c-object-to-objective-c-class C Object to Objective C Class I'm trying to mix C and Objective C I've made it most of the way but would like to have a..
How to reduce the size of my iPhone application? http://stackoverflow.com/questions/2490910/how-to-reduce-the-size-of-my-iphone-application my iPhone application Alternative Titles to aid searches Compressing PNGs Reduce the size of an iPhone Archive .ipa Adding a build rule to compress images in Xcode iOS Apps can only be downloaded via 3G if they are less than 100MB. What are the..
Adding the Facebook Like Button in an iPhone App http://stackoverflow.com/questions/2783803/adding-the-facebook-like-button-in-an-iphone-app the Facebook Like Button in an iPhone App Does anyone know how I would include a facbeook like button in an iphone app...
Adding view on StatusBar in iPhone http://stackoverflow.com/questions/2833724/adding-view-on-statusbar-in-iphone view on StatusBar in iPhone Is it possible to add a UIView on the staus bar of size 320 x 20 I don't want to hide the status..
Adding the “Clear” Button to an iPhone UITextField http://stackoverflow.com/questions/320078/adding-the-clear-button-to-an-iphone-uitextfield the &ldquo Clear&rdquo Button to an iPhone UITextField How do you add that little X button on the right side of a UITextField..
Adding a UILabel to a UIToolbar http://stackoverflow.com/questions/333441/adding-a-uilabel-to-a-uitoolbar a UILabel to a UIToolbar I'm trying to add a label to my toolbar. Button works great however when I add the label object..
Adding devices to team provisioning profile http://stackoverflow.com/questions/3578158/adding-devices-to-team-provisioning-profile devices to team provisioning profile I need to add a device to my team provisioning profile however I do not physically..
$(document).click() not working correctly on iPhone. jquery http://stackoverflow.com/questions/3705937/document-click-not-working-correctly-on-iphone-jquery basic and shouldnt be a problem. Any ideas javascript jquery iphone click onclick share improve this question Adding in the following code works. The problem is iPhones dont raise click events. They raise touch events. Thanks very much apple...
Adding “Open In…” option to iOS app http://stackoverflow.com/questions/3981199/adding-open-in-option-to-ios-app &ldquo Open In&hellip &rdquo option to iOS app On iOS devices the Mail app offers Open In... option for attachments. The..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file provider CGContextDrawImage pdfContext CGRectMake 200 200 207 385 image CGImageRelease image End image code Adding some text on top of the image we just added CGContextSelectFont pdfContext Helvetica 16 kCGEncodingMacRoman CGContextSetTextDrawingMode..
Adding images to iPhone Simulator http://stackoverflow.com/questions/468879/adding-images-to-iphone-simulator images to iPhone Simulator I am trying to use UIImagePickerController with UIImagePickerControllerSourceTypePhotoLibrary..
http://stackoverflow.com/questions/602717/aligning-uitoolbar-items NSArray arrayWithObjects flexibleSpace settingsButton deleteButton aboutButton flexibleSpace nil flexibleSpace release Adding these as you would any other toolbar items will distribute space evenly between the two of them. share improve this answer..
Adding quartzcore to xcode 4 for iOS http://stackoverflow.com/questions/6956432/adding-quartzcore-to-xcode-4-for-ios quartzcore to xcode 4 for iOS I have troubles installing quartzcore on xCode 4 regarding an iOS application. I've searched..
UIScrollView : paging horizontally, scrolling vertically? http://stackoverflow.com/questions/728014/uiscrollview-paging-horizontally-scrolling-vertically
http://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su or modal controllers NavigationControllers have ViewController stacks to manage and limited animation transitions. Adding a view controller as a sub view to an existing view controller requires passing events to the sub view controller which..
Transparent Modal View on Navigation Controller http://stackoverflow.com/questions/849458/transparent-modal-view-on-navigation-controller modalView.frame.size.width 2 modalView.frame.size.height 2 modalView addSubview label self.view addSubview modalView Adding the modalView as a subview to the root view like this will not actually cover the navigation bar but it will cover the entire..
How to resolve 'unrecognized selector sent to instance'? http://stackoverflow.com/questions/861626/how-to-resolve-unrecognized-selector-sent-to-instance it is known in the calling app. The particular class is compiled into the static library target. What am I missing Adding some code. static library ClassA.h @interface ClassA NSObject ... NSString downloadUrl @property nonatomic copy NSString..
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