for-in循环遍历项目集合,例如数字范围,数组中的项目或字符串中的字符 -
Swift 4编程语言中for-in循环的语法是 -
for index in var {
statement(s)
}
Example
var someInts:[Int] = [10, 20, 30]
for index in someInts {
print( "Value of index is \(index)")
}
执行上述代码时,会产生以下结果 -
Value of index is 10
Value of index is 20
Value of index is 30