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Recent questions tagged core

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Solution to Value cannot be null. (Parameter 'source') Error in production

I got the following error in production Value cannot be null. (Parameter 'source') My enum values are public enum ... GetBytes(String s) could you pleas help me to solved this...

asked Oct 27, 2021 in Others[杂七杂八] by AgMohamed (120 points)

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545 views

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core graphics - On iOS, after we create a layer from context and get the layer's context, how do these contexts relate to each other?

We can create a layer from the current graphics context and then get the layer's context: CGContextRef context = ... out there" by itself? 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 - Bundling the JRE with a Java application

I have created an exe with a launch4j Ant script and build.xml file. I want to bundle the JRE in my application ... do I do this? Thanks, Rajani 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 text - Issue with CoreText CTFrameGetLineOrigins in Swift

I have the following code working in Objective-C NSArray *lines = (NSArray *)CTFrameGetLines((__bridge CTFrameRef) ... of what is missing? 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 - Swift: detecting an unexpected nil value in a non-optional at runtime: casting as optional fails

I have a UITableViewController loading its entries from Core Data via a NSFetchedResultsController. Like this: let ... this approach work? See Question&Answers more detail:os...

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

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753 views

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core data - iOS: natural sort order

I have an app for iOS that uses Core Data to save and retrieve data. How would I fetch data sorted ... I need: 1_title 10_title 100_title 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 - Can I use an NSPredicate in Swift with a nil argument?

I'm trying to convert a project that uses Core Data from Objective-C to Swift. The data model is structured so ... way to do this in Swift? See Question&Answers more detail:os...

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

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678 views

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core data - iOS CoreData inverse relationships to itself

I am trying to build a CoreData model similar to Twitter user when User can have many other users who follows ... to deal with this situation? 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 graphics - iOS Drawing text in the centre of shapes

I'm trying to draw text in the centre of shapes in iOS, an example would be Microsoft Office's insert shape ... a shape? Thank you, Danielle. 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 - How to define CoreData relationship in Swift?

In CoreData, I have defined an unordered to-many relationship from Node to Tag. I've created an Swift entity ... type for to-many relationships? 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 - iOS UITableView sections with fetchedResultsController confusion

I have an entity being displayed in a table view in just one section. The entity has two attributes, ... title to each section header. See Question&Answers more detail:os...

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

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580 views

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core data - How to get a diffable snapshot from an NSFetchResultsController in iOS 13?

So here we are in WWDC 2019 video 230, and starting at about minute 14 it is claimed that ... data source generic types be? 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 - NSDictionaryResultType expression not taking into account newly inserted objects

I want the maximum value of a field in core data so I have set up the following request: // Create fetch ... it in the docs. Thanks, Mike See Question&Answers more detail:os...

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

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717 views

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core animation - CABasicAnimation with CALayer path doesn't animate

I'm trying to animation the transition of a CALayer from normal corners to rounded corners. I only want to ... from' value for the animation. See Question&Answers more detail:os...

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

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782 views

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core graphics - Swift 3 and CGContextDrawImage

I want to translate this line to the Swift 3 current syntax code but seems there are some problems: ... new swift 3 syntax code? See Question&Answers more detail:os...

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

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603 views

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core data - What does the Indexed Property of a CoreData attribute do?

I have a Core data model with a 32bit hash value. I need to look up specific hash values quickly. Should I ... So what does indexed do exactly? See Question&Answers more detail:os...

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

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572 views

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core audio - How to manually convert 8.24-bit deinterleaved lpcm to 16-bit lpcm?

I have a chunk of data (void*) which is 2 ch, 44100 Hz, 'lpcm' 8.24-bit little-endian signed ... how do I convert deinterleaved to interleaved? See Question&Answers more detail:os...

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

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959 views

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core graphics - How use CGImageCreateWithImageInRect for iPhone 4 (HD)?

I use the following code to getting images from the sprite. And it works fine everywhere except ... here says nothing. See Question&Answers more detail:os...

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

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410 views

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core graphics - How do I create a smoothly resizable circular UIView?

I'm trying to create a UIView which shows a semitransparent circle with an opaque border inside its bounds. ... animation within -[setBounds]. See Question&Answers more detail:os...

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

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753 views

1 answer

core graphics - How to get the physical display resolution on MacOS?

I'm looking to find the value that "About this Mac" shows (2560 x 1600 on my 13" MBP). I have tried ... the missing link;-) Thank you Ken! See Question&Answers more detail:os...

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

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605 views

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core animation - How to apply partial fade in-out in IOS?

I have 2 images. One is in the back of the other. I want to fade-out the top image starting from the left ... this? Should I use gradient mask? See Question&Answers more detail:os...

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

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716 views

1 answer

core text - CoreText. How Do I Calculate the Bounding Box of an Attributed String?

In CoreText it is easy ask: "for a given rectangle how much of this attributed string will fit?". ... to do this? Thanks, Doug See Question&Answers more detail:os...

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

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866 views

1 answer

core data - SwiftUI / CoreData / Master / Detail (with editing) / Xcode 11 - Beta 5

Working on a sample app. The goal is to have a list pulled up from CoreData in a Master, and then click on ... (isOn: $entityName.active) } } } See Question&Answers more detail:os...

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

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554 views

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core animation - animating multiple CALayers, but not in the same time space

I have several CALayers that I'm trying to animate to a new zPosition with each layer slightly delayed from the others ... in this way, and how? See Question&Answers more detail:os...

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

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882 views

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core audio - iPhone SDK: AVAudioRecorder metering -- how to change peakPowerForChannel from decibel into percentage?

The AVAudioRecorder in the iPhone SDK can be used to get the peak and average power for a channel, in decibels. ... for an audio level meter? See Question&Answers more detail:os...

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

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707 views

1 answer

core graphics - How to draw heart shape in UIView (iOS)?

I want to create different shapes. Below image is the one of example. Will you suggest me how to different shapes? See Question&Answers more detail:os...

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

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515 views

1 answer

core graphics - IOS : Animate transformation from a line to a bezier curve

I would like to animate a straight line curving into a bezier curve (from "_" to "n"), is there a library ... does that it would be cool :-) See Question&Answers more detail:os...

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

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881 views

1 answer

core animation - What is the full Keypath list for CABasicAnimation?

I've looked in the documentation but I noticed it's missing some like "transform.scale.xy": [CoreAnimation Guide ... there a more complete list? See Question&Answers more detail:os...

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

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