Recent questions tagged core

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core telephony - Detect if iPhone is in Airplane mode?

I need a way to detect if the iPhone is in Airplane Mode or not, I did some research and found: iphone how to ... that I can do my job? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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436 views

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core graphics - Calculate controlPoints while drawing in iOS

I am working on a drawing app, where user can draw/write with his finger or stylus. For this I have ... understanding where I am going wrong. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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core data - NSSortDescriptor with to-many relationship

I have a Parent entity which has to-many Child. If I order the Parent fetch with a property (e.g. name), ... it each time I add a child? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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388 views

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core data - NSPredicate BETWEEN with NSDate causes -[__NSDate constantValue]: unrecognized selector sent to instance 0x1e7ff0

I'm trying to fetch from Core Data records that have a startTime between two dates. Here's my code: NSDate * ... see where I'm going wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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964 views

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core data - Swift: How do I create a predicate with an Int value?

I am getting an EXC-BAD-ACCESS error on this statement: var thisPredicate = NSPredicate(format: "(sectionNumber = ... Why is this happening? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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419 views

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core - How getClassLoader().getResourceAsStream() works in java

I google how below code loads the resource Abc.class.getClassLoader().getResourceAsStream("abc.txt") and find ... to specify the package path See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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430 views

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core data - What to do when get "The model used to open the store is incompatible with the one used to create the store"?

I had a core data EntityDescription and I created data in it. Then, I changed the EntityDescription, added new ... "_NSAutoVacuumLevel" = 2; }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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579 views

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core data - Iphone NSPredicate how to do an INNER JOIN?

I have been looking thru the documentation and some other posts in this site, but I simply cannot understand ... apreciated. Thank you. -Oscar See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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875 views

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core data - Using Swift protocols with generics

I have a simple example that seems like it should work: import CoreData @objc protocol CoreDataModel { @optional class ... T return object } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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510 views

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core data - Subclassing NSManagedObject with swift 3 and Xcode 8 beta

I've began to try use Core data with swift 3 and Xcode 8 beta. When I try to generate NSManagedObject ... meaning of this new file? Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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434 views

1 answer

core location - Beacon Ranging in Background on iOS

I understand the difference between monitoring and ranging, and I understand the limitation of iOS in that beacon ... add that too. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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732 views

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core data - SwiftUI reorder CoreData Objects in List

I want to change the order of the rows in a list that retrieves objects from the core data. Moving rows works, but ... ) } } Thank you for help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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435 views

1 answer

core location - Search for all iBeacons and not just with specific UUID

Is it possible to search for all iBeacons which are nearby? I know it's possible to search iBeacons by UUID. ... to find all iBeacons nearby. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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802 views

1 answer

core motion - Swift watchOS 2 - CMSensorDataList

Short: I don't know how to extract the CMRecordedAccelerometerData from the CMSensorDataList after getting one from ... (self) } } See Question&Answers more detail:os...