You just have syntax error when saying = {return self.someValue}. The = isn’t needed. Use : if you want get only you can write with the first way you can also add observers as set willSet & didSet allowing to use = operator as a setter
You should convert one type to the other one so both variable should be the same types:
I have no idea what I am doing wrong. I am also quite new to programming so I am not very good at debugging. This was a test app so that I can see how swift ties in with app development. So far, I have got this: I am getting the error “Unrecognized selector sent … Read more
From the official Swift programming guide: Global variables are variables that are defined outside of any function, method, closure, or type context. Global constants and variables are always computed lazily. You can define it in any file and can access it in current module anywhere. So you can define it somewhere in the file outside of any scope. … Read more
Xcode 8 • Swift 3
The format specifiers for String formatting in Swift are the same as those in Objective-C NSString format, itself identical to those for CFString format and are buried deep in the archives of Apple Documentation (same content for both pages, both originally from year 2002 or older): https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFStrings/formatSpecifiers.html https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html But this documentation page itself is incomplete, … Read more
I’m trying to write a BMI program in swift language. And I got this problem: how to convert a String to a Double? In Objective-C, I can do like this: double myDouble = [myString doubleValue]; But how can I achieve this in Swift language?
Types of Things in Swift The rule is: Class instances are reference types (i.e. your reference to a class instance is effectively a pointer) Functions are reference types Everything else is a value type; “everything else” simply means instances of structs and instances of enums, because that’s all there is in Swift. Arrays and strings are struct instances, for example. You can pass … Read more
Swift itself doesn’t use selectors — several design patterns that in Objective-C make use of selectors work differently in Swift. (For example, use optional chaining on protocol types or is/as tests instead of respondsToSelector:, and use closures wherever you can instead of performSelector: for better type/memory safety.) But there are still a number of important ObjC-based APIs that use selectors, including timers … Read more
You have your storyboard set up to expect an outlet called tableView but the actual outlet name is myTableView. If you delete the connection in the storyboard and reconnect to the right variable name, it should fix the problem.