swift

问题 I am struggling to simply create a folder in the users download directory on macos with this code: static func createFolderInDownloadsDirectory() { let downloadsDirectory = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first! let downloadsDirectoryWithFolder = downloadsDirectory.appendingPathComponent("FolderToCreate") do { try FileManager.default.createDirectory(at: downloadsDirectoryWithFolder, withIntermediateDirectories: true, attributes: nil) } catch let error

问题 I am struggling to simply create a folder in the users download directory on macos with this code: static func createFolderInDownloadsDirectory() { let downloadsDirectory = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first! let downloadsDirectoryWithFolder = downloadsDirectory.appendingPathComponent("FolderToCreate") do { try FileManager.default.createDirectory(at: downloadsDirectoryWithFolder, withIntermediateDirectories: true, attributes: nil) } catch let error

问题 These are the two the blend-mode i used in OpenGL what is the conversion to the metal in IOS glEnable(GL_BLEND); glBlendFuncSeparate(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA,GL_ONE,GL_ONE_MINUS_SRC_ALPHA); glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_SRC_ALPHA, GL_ONE); 回答1: You configure blending on your render pipeline descriptor . I believe the equivalent configurations for your GL code are: // glEnable(GL_BLEND) renderPipelineDescriptor.colorAttachments[0].isBlendingEnabled = true //

问题 I'm working on an app in which PayPal payment gateway is to integrate. As such I have gone through several blog but did not found it helpful. So if any can suggest something that would be very helpful. 回答1: For integrating Paypal payment into your swift ios application, you would need to use Braintree SDK which provides all the inbuilt functions for implementation. Its always better to implement client-server architecture for payment where the server would have the business logic and client

问题 I try to display data from a Firebase database into my tableView. The code worked using "Tabs View Controller", but for the purpose of the project I had to include a TableView in a classic ViewController. Here is the code that should get the data from the database, and further include it in the tableview. import UIKit import Firebase import FirebaseAuth import FirebaseDatabase class NewsfeedViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { var ref

问题 I have a collection view, and each collection view cell will have a table view which will have different data for each collection view cell. The collection view is done using a storyboard and works fine, but I can not seem to get a UITableView to work inside of it. The Collection view code is below and any help is appreciated. Ideally a technique that allows me to use storyboard to customise the tableview cell, and I am using Swift 4. extension StoryboardViewController:

问题 I am programming with Swift in Xcode (MacBook Air 2015) and I want to change my Swift version from 5 to 4. How to do that? 回答1: Project ► (Select Your Project Target) ► Build Settings ► (Type 'swift_version' in the Search bar) Swift Compiler Language ► Swift Language Version ► Click on Language list Here you can change your version. 来源： https://stackoverflow.com/questions/56894082/how-to-change-swift-version-from-5-to-4-in-xcode

问题 I am using xCode 7 beta and swift, and storing my data using Parse.com. In which method in the UITableViewController should I be asking for data from my database? I need to ensure it is all present by the point in the lifecycle of the controller at which the cells need to be presented. Is there anyway to guarantee this if I am loading data asynchronously? 回答1: viewDidLoad would be a good place for this but there might be a few second difference between displaying a blank tableView and when it

问题 I am using xCode 7 beta and swift, and storing my data using Parse.com. In which method in the UITableViewController should I be asking for data from my database? I need to ensure it is all present by the point in the lifecycle of the controller at which the cells need to be presented. Is there anyway to guarantee this if I am loading data asynchronously? 回答1: viewDidLoad would be a good place for this but there might be a few second difference between displaying a blank tableView and when it

问题 I am trying to generate the face mesh from the AR face tutorial with proper vertices label using SCNText. I follow the online tutorial and have the following: enterextension EmojiBlingViewController: ARSCNViewDelegate { func renderer(_ renderer: SCNSceneRenderer,didUpdate node: SCNNode,for anchor: ARAnchor) { guard let faceAnchor = anchor as? ARFaceAnchor, let faceGeometry = node.geometry as? ARSCNFaceGeometry else { return } faceGeometry.update(from: faceAnchor.geometry) } func renderer(_