swift3

问题 By default the launch screen provides a status bar. Is it possible to hide the status bar in launch screen like a Twitter app ( iOS ). 回答1: To Hide Status Bar initially on launch screen, set Hide status bar check mark on ✓ OR In Your Info.plist add: Status bar is initially hidden YES . The above both option having same impact. Additionally To Hide Status Bar on specific ViewController override prefersStatusBarHidden with true override var prefersStatusBarHidden: Bool{ return true } 来源： https:

问题 My app has been rejected from Apple quite a long time now. They say that I get crash on dashboard but although it works fine on simulator and device I implemented 2 approaches to get the crash report Firebase Analytics Symbolised the crash reported shared by Apple. .init(coder:) It says error generated by compiler 8 SSBS 0x10521c174 DashboardViewController.init(coder:) + 5308788 (<compiler-generated>:0) 9 SSBS 0x10521c238 @objc DashboardViewController.init(coder:) + 5308984 (<compiler

问题 I created a prototype that successfully implements a Source View based on this tutorial. I then attempted to port it to the real application. When I run it, I get the error 2016-12-17 18:30:43.693194 jazzcat[67629:1970219] *** Illegal NSOutlineView data source (). Must implement outlineView:numberOfChildrenOfItem:, outlineView:isItemExpandable:, outlineView:child:ofItem: and outlineView:objectValueForTableColumn:byItem: I've spent hours comparing the two applications and can't find a

问题 I am trying to convert an existing program which uses a list of predefined colors from Objective-C to Swift. The original code used Selector to extract a UIColor based on it name represented as a NSString #define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0] -(UIColor *)getColor:(NSString*)colorName { SEL selColor = NSSelectorFromString(colorName);

问题 I am trying to convert an existing program which uses a list of predefined colors from Objective-C to Swift. The original code used Selector to extract a UIColor based on it name represented as a NSString #define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0] -(UIColor *)getColor:(NSString*)colorName { SEL selColor = NSSelectorFromString(colorName);

问题 Hi I want to get time as 11:40 from "2017-07-31T11:40:00.000Z" Below is the code I am using: let formatter = Foundation.DateFormatter() formatter.dateFormat = "YYYY-MM-dd'T'HH:mm:ss.sssZ" //2017-04-01T18:05:00.000 let date1 = formatter.date(from: data.arvTime) print("date:\(String(describing: date1))") let dateFormatterPrint = Foundation.DateFormatter() dateFormatterPrint.dateFormat = "HH:mm" let resultTime = dateFormatterPrint.string(from: date1!) print("time:\(String(describing: resultTime)

问题 I have the following code written in Objective C that I am trying to get working in Swift 3. Some of the functions equivalents do not appear to be available in Swift 3. Here is the code is the code in Objective C NSUUID *vendorIdentifier = [[UIDevice currentDevice] identifierForVendor]; uuid_t uuid; [vendorIdentifier getUUIDBytes:uuid]; NSData *vendorData = [NSData dataWithBytes:uuid length:16]; and my current effort in Swift 3 which compiles and runs but is not giving the correct answer. let

问题 I've been using NSLock s to synchronize touchy parts of code, but have been running into issues due to the fact that they must be unlocked from the same thread that they were locked from. Then I found that GCD's DispatchSemaphore s seem to do the same thing, with the added convenience that they can be signaled from any thread. I was wondering, though, if this convenience comes at the price of thread-safety. Is it advisable to replace let lock = NSLock() lock.lock() // do things... lock.unlock

问题 I want to remove the bottom padding of a UILabel with attributedText inside a UIStackview. I found this solution How to remove the extra padding below an one line UILabel. This works with normal text but not with attributed text. let textLabel = UILabel() textLabel.translatesAutoresizingMaskIntoConstraints = false textLabel.text = "What is a chemical property and how can you observe it?" textLabel.numberOfLines = 0 textLabel.lineBreakMode = .byWordWrapping textLabel.backgroundColor =

问题 Excuse the length of this question, but I have a swift UI that has words displayed in concentric circles. I want to be able to press the right and left button and have the words rotate clockwise and counterclockwise respectively. My withAnimation{} button function works as long as the text is not in a ForEach loop. Is there a way to change state variables that are in a ForEach loop? In my case animate a rotation of a view that is within a ForEach. In this case I want to use the slider to pick