ios8

问题 I am using the UIDocumentPicker to select a file but if it's large it can take a while to open and that is not a particularly good experience for users. I have looked at the iCloud programming guide from Apple and I cannot seem to figure out how to actually download a file and get some progress feedback, the documentation is just too vague. I know I am supposed to do something with NSMetadataItems, but there isn't much explaining actually how to get one and use it. Can someone please explain

问题 I'm getting a lot of crash reports on iOS 8 with this stack trace: Date/Time: 2014-09-17T20:26:15Z OS Version: iPhone OS 8.0 (12A365) Report Version: 104 Exception Type: SIGSEGV Exception Codes: SEGV_ACCERR at 0x1 Crashed Thread: 0 Thread 0 Crashed: 0 libGPUSupportMercury.dylib 0x2a4f88fe gldGetBufferAllocationIdentifiers + 194 1 libGPUSupportMercury.dylib 0x2a4f93cb gpusSubmitDataBuffers + 108 2 libGPUSupportMercury.dylib 0x2a4f9249 gldCreateContext + 206 3 GLEngine 0x2613c93b

问题 I have background mode on for location services and aiming to send out location (latitude and longitude) to the server every 30 minutes. For now I am printing the same in the console. It seems to work for a while but I am wondering how do I work with NSTimer in this case. And from where should I be calling it? import UIKit import CoreLocation @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate, CLLocationManagerDelegate { var window: UIWindow? var locationManager =

问题 In CoreData I have defined an ordered to-many relationship. This relationship is defined in Swift like this: @NSManaged var types : NSMutableArray However, to use Swift at it's best, I want to use a normal Swift array like Type[] . However, CoreData forces me to use NS(Mutable)Array . How can I type-cast / convert the NSArray to Array<Type>[] ? Apparently the confusion arises from the following error: let array = obj.types as T[] // Cannot convert expression's type 'Node[]' to type '$T2'

问题 What are sizes/naming of the launch images used for iPhone app in iOS ? 回答1: Size Conventions iPhone3g : 320 x 480 iPhone4/4s : 640 x 960 iPhone5/5s : 640 x 1136 iPhone6 : 750 x 1334 iPhone 6plus : 1242 x 2208 Naming Conventions For developers who don't wan't to use 'Asset Catalogs', they need to give specific names to launch images iPhone3g : 'Default.png' iPhone4/4s : 'Default@2x.png' iPhone5/5s : 'Default-568h@2x.png' iPhone6 : 'Default-667h@2x.png' iPhone6plus : 'Default-736h@3x.png' For

问题 I have run into an issue on iOS 8 with the Assets Library framework that appears to be a bug in iOS 8. If I create an album called 'MyMedia' and then delete it, then when I try to create the album again, this chunk of code below returns 'nil' indicating that the album 'MyMedia' exists even though it does not because I deleted it using the 'Photos' app. __block ALAssetsGroup *myGroup = nil; __block BOOL addAssetDone = false; NSString *albumName = @"MyMedia"; [assetsLib

问题 I've updated my "old" Objective-C app to use the new storyboard with size classes, set the deployment target to iOS 8 and uploaded the new binary to the App Store. Still, the App Store doesn't show the text "this app is optimized for iPhone 6 and 6 plus". The text only mentions iPhone 5S and everything below. What am I supposed to do in order to get the app iPhone 6 approved? 回答1: The solution was to add @3x versions for all used images and using the new size classes. You notice the app from

问题 I am looking for an effective way to re-position a popover using the new uipopoverpresentationcontroller. I have succesfully presented the popover, and now I want to move it without dismissing and presenting again. I am having trouble using the function: (void)popoverPresentationController:(UIPopoverPresentationController *)popoverPresentationController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView **)view I know it's early in the game, but it anyone has an example of

问题 I just downloaded Xcode 6 & played with it a bit. After switching back to previous version of Xcode and running in simulator, I keep getting this error. Unable to determine simulator device to boot. How do we resolve this? Thanks in advance. 回答1: Make sure you have only one iOS Simulator instance running in the Dock. 回答2: There was a simple answer to this for me: Open the simulator via Xcode -> Open Developer Tool -> iOS simulator (even if it can't launch, the app will be open). With the

问题 When I'm initializing an instance of an entity I'm getting the error Variable used within its own initial value . Here is the code throwing the error: class func buildWordDefinition (word:String, language:Language, root:TBXMLElement) -> WordDefinition { let word = WordDefinition(word: word, language: language) The error points at the word variable. Here is the WordDefinition class: class WordDefinition { let word: String let language: Language init(word: String, language:Language) { self.word