while

Swift's while loop functions much the same as it does in any language:

while limit > 0 
{ 
    // doSomething() 
    limit -= 1 
} 

If you want the code to run first once, and then test a condition, use repeat:

repeat 
{ 
    doSomethingRepetitive() 
    limit -= 1 
} 
while limit > 0 

Between them, these two statements will cover the (usually infrequent) cases that are not covered by the enumeration loop statements.