[Swift] Learning notes----variables are not initialized by default

Source: Internet
Author: User

The top of a variable, if not initialized, is not practical, Swift will error.

Visual objects must also be new before they can be used.

This is another way I agree with Apple.

Swift is really good!

If the variable is declared as an optional value, the variable defaults to a nil value (both null and void)

Syntax is

var i:int?;

(Spit trough The following blog park: Incredibly can not blog page directly edit blog post, must enter the background management can be edited, really weak explosion Ah! It seems that blog Park is not a permanent term for blogging! )

[Swift] Learning notes----variables are not initialized by default

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