You can use if and let together to work with values that might be missing. These values are represented as optionals. An optional value either contains a value or contains nil to indicate that the value is missing. Write a question mark (?) after the type of a value to mark the value as optional. If the optional value is nil, the conditional is false and the code … Read more
You have to declare 2 different NSDateFormatters, the first to convert the string to a NSDate and the second to print the date in your format.Try this code: Swift 3 and higher: From Swift 3 NSDate class has been changed to Date and NSDateFormatter to DateFormatter.
I have made several Unity3D projects for iOS using a Windows. When installing Unity, don’t forget to check “iOS deployment” and your Unity (on Windows) will be able to build an Xcode project. Then, just transfer this Xcode project on a Mac with Xcode installed and you will be able to compile the project in … Read more
My problem was actually that my build was in Release mode instead of Debug mode. As a result, the identifier was pointing to something that was not in existence. I changed the build type and it ended up working.
75 duplicate symbols for architecture x86_64 Means that you have loaded same functions twice. As the issue disappear after removing -ObjC from Other Linker Flags, this means that this option result that functions loads twice: from Technical Q&A This flag causes the linker to load every object file in the library that defines an Objective-C … Read more
This line means: Get the Screen object, get the text property and please crash if it doesn’t exist, then get the text converted to an integer, and please crash if it doesn’t exist. That’s what the ! means: “I am sure this thing exists, so please crash if it doesn’t”. And crash is what it did.
It downloads the (debug) symbols from the device, so it becomes possible to debug on devices with that specific iOS version and also to symbolicate crash reports that happened on that iOS version. Since symbols are CPU specific, the above only works if you have imported the symbols not only for a specific iOS device … Read more
The NSURLErrorDomain error codes are listed here https://developer.apple.com/documentation/foundation/1508628-url_loading_system_error_codes However, 400 is just the http status code (http://www.w3.org/Protocols/HTTP/HTRESP.html) being returned which means you’ve got something wrong with your request.
I was having this exact same problem. Please make sure that you are on Xcode 7.3 and using Swift 2.2. You can check your Swift version using xcrun swift -version. Updating Xcode to 7.3 should also automatically update Swift. Updating Xcode resolved this issue for me.
I have a big problem with my iOS App: it crashes sometimes without detailed debug error. The stack trace is empty. These are the only two lines in the stack trace: crash start in UIApplicationMain at “symbol stub for: -[_UIHostedTextServiceSession dismissTextServiceAnimated:]”. and report “libsystem_c.dylib`malloc_error_break”. in com.apple.main-thread. The error on Xcode debugger (with connected device): I … Read more