Swift 2.0 Syntax Branch

Import UIKit

Note : You can not write in Swift ; Number , but there is a certain precondition , a line only one sentence code

If a line has multiple lines of code, then ; Still have to write

Note : Swift is a perverted place , sometimes the operator's left and right if there is no space to write an error

Let num = ten

/*:

If

* If in Swift and if usage in OC is roughly the same , knowledge is slightly different in detail

Different points

* 1.OC Central Africa 0 is true , and there is no such concept in Swift, the conditional expression for if in Swift must be a bool value

* The true bool type is available in Swift, with a value of true/false

* the () of conditional expressions in 2.Swift can be omitted

* 3.OC If there is only one statement in the If , then {} can be omitted , but the Swift is not allowed to omit , even if only one can not

* If else/if else if the write is the same as OC

*/

If num = = Ten

{

Print(" is ten")

}

If num = = 5

{

Print("5")

}Else

{

Print("ten")

}

/*:

Trinocular operator

* The three-mesh operator in Swift is exactly the same as OC, except that the conditional expression can only be of type bool

* in Swift Development, the trinocular operator uses very much

*/

Let value = Ten

Let res = value = = ? : 0

/*:

Switch

* switch usage in Swift is roughly the same as in OC

Different points :

* The conditional expression () can be omitted

* in OC if the break after the case is omitted , Swift does not

* in OC if you want to define variables in case, You must add {}, otherwise the scope is confusing, and Swift does not

* the location of default in OC can be arbitrarily written , will be judged after all the case will execute default, and Swift Can not be randomly written in the last

* default can be omitted in OC , and most cases in Swift cannot be omitted.

*/

Let number = 0

Switch number

{

case 0:

Print("0")

let a = 998

Case 5:

Print("5")

case ten:

Print("ten")

default:

Print("Other")

}

Swift 2.0 Syntax Branch