The switch statement allows you to test when a variable is equal to multiplevalues. In the Swift language, as long as the match to The syntax of switch statements in the Swift language: It is generally not used in switch statements We need to pay attention to this. If used
case
statement,the entire switch statement is executed. 9.15.1. Grammar #
switch expression {
case expression1 :
statement(s)
fallthrough /* optional */
case expression2, expression3 :
statement(s)
fallthrough /* optional */
default : /* optional */
statement(s);
}
fallthrough
statement.
case
if you do not use the
fallthrough
statement, the current
case
statement, the switch terminates and the control flow jumps to the next line after the switch statement.
fallthrough
statement, the execution of the
case
or
default
statement that is executed regardless of whether the condition is met or not.