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Written in front: the content of the study is mainly from "the Swift programming Language". You can download it in itunes as part of the translation content and understanding. Due to limited English proficiency, part of the Google translation
Gossip Less, open the whole:
Hello World (Getting started)
All the programs have just started to write Hello world. In Swift, so to write
println ("Hello, World")The article also mentions what Xcode has to add: Playground, writing code in the playground. The ability to see execution results directly without the need for compilation. Save time and improve efficiency. BlaBla
Simple Values (basic data types)
Use let to define a constant, use Var to define a variable
Note: new features. The compiler determines the type of constant or variable, as in the above code, the compiler determines that myvariable is shaping, because the initial value is a shape (a bit like JS)var myvariable = 42myVariable = 50let Myconstant = 42
Suppose the initial value does not provide enough information to infer the type (or no initial value). Want to specify the type of variable or constant swollen? ——— add a type after a constant or variable and separate it with a colon
Let Implicitinteger = 70let implicitdouble = 70.0let explicitdouble:double = 70
Other than that. The type of the value does not have to be self-loading, which means that you still need to use type conversion (no conversion will be an error.) This is not necessary, for example, using string (9) to convert a shape to a string type
Let label = ' the width is ' let width = 94let widthlabel = label + String (width)
Another way to put a variable or constant in a string. Put the variable in parentheses (), preceded by a backslash \, such as \ (variable. constant)
Let apples = 3let oranges = 5let applesummary = "I has \ (apples) apples." Let fruitsummary = "I has \ (apples + oranges) pieces of fruit.
Use brackets [] to define an array or dictionary, with the following proportions:
var shoppinglist = ["Catfish", "water", "tulips", "Blue paint"]shoppinglist[1] = "bottle of water" var occupations = [
"Malcolm": "Captain", "Kaylee": "Mechanic", "Jayne": "WTF"]
Initializes an empty array or dictionary:
Let Emptyarray = string[] () Let emptydictionary = Dictionary<string, float> ()
In the next section we'll talk about conditional statements in the basics.
Q=swift&t=blog "target=" _blank ">swift /
q= basic &t=blog "target=" _blank "> base /
?????? Tuples (meta-group) ...
Reprint Please specify: Dongsheng's blog???????????? Swift provides signed and unsigned integers in 8, 16, 32, 64-bit form. These integer types follow the naming conventions of the C language, and I summarize the integral types in swift:?...
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