Suppose that I have a String object in Swift and I want to use String format class method to combine it and several other objects like this:
var foo = 0
var str = "str"
String(format: "%d (%s)", foo, str)
This example doesn't work as expected because %s can't handle String objects. How can I do it then?
Thanks in advance.
String(format:) is bridged to the -[NSString initWithFormat] method and accepts
the same format specifiers, such as %@ for objects. String is bridged to
NSString automatically, therefore you can use %@ for Swift strings as well. Also note that the Swift Int type corresponds to long in C:
var foo = 0
var str = "str"
let result = String(format: "%ld (%@)", foo, str)
you just use string interpolation
var foo = 0
var str = "str"
String(format: "%d (\(str))", foo)
str = "str%d".Unless there's a reason you need the Foundation method for String creation, you can use "string interpolation". For instance:
let str = "I am \(height.feet) feet \(height.inches) inches tall."
Produces: "I am 6 feet 5 inches tall." Using string interpolation you can insert your variables inline and not have to mess with C-esque placeholders in a format statement.
