Is that possible to set a primary key in CoreData iOS swift?

-
Solution:

 There is no primary key available in coredata.It has more than a database.It will had relationShips and entities.

If you want to implement primary key then you can do onething to store an identifier with Integer and use it as primary key.But you cannot be set as primary key in coredata.

So you can do that fetch the data from coredata with predicate and check that identifier is available or not then save it in coredata.

Comments

Post a Comment

Popular posts from this blog

Invalid bundle error while upload the app to the app Store

-
Image
Problem:  Invalid bundle. The “ UIInterfaceOrientationLandscap eLeft, UIInterfaceOrientationLandscap eRight, UIInterfaceOrientationPortrait ” orientations were provided for the UISupportedInterfaceOrientatio ns Info.plist key in the com.myapp bundle, but you need to include all of the “ UIInterfaceOrientationPortrait , UIInterfaceOrientationPortrait UpsideDown, UIInterfaceOrientationLandscap eLeft, UIInterfaceOrientationLandscap eRight” orientations to support iPad multitasking. For details, visit:  https://developer.apple.com/ documentation/bundleresources/ information_property_list/ uisupportedinterfaceorientatio ns . (ID: something) Solution: In the above image you have to check the full screen option enabled.If not then enable and upload it will works.
Read more

Convert NsNumber, NSDate to String in iOS Swift

-
Code: String (describing: nsnumbervalue )          (or) String (nsnumbervalue ) The above code is used to convert the NsNumber to String.  NSDate To String String (describing: Date ) Combine NsNumber and string to String Code: String ( " \ ( nsnumbervalue ) km" ) Convert Float to String  Code: String (describing: floatvalue )
Read more

Global LocationManager Singleton class iOS Swift

-
If you are using location based values in all the screen of apps then its a better to implement as a singleton class.First import the core location.The class will be as follows. Code: import UIKit import CoreLocation protocol LocationServiceDelegate {     func tracingLocation(currentLocation: CLLocation )     func tracingLocationDidFailWithError(error: NSError ) } class LocationSingleton: NSObject , CLLocationManagerDelegate {     var locationManager: CLLocationManager ?     var lastLocation: CLLocation ?     var delegate: LocationServiceDelegate ?     static let sharedInstance: LocationSingleton = {         let instance = LocationSingleton ()         return instance     }()          override init () {         super . init ()         self . locationManager = CLLocationManager ()                  guard let locationManagers= self . locationManager else {             return         }                 
Read more