How to execute a swift for in loop in one step- How can I do a Swift for-in loop with a step?

problem ：

With the removal of the traditional C-style for-loop in Swift 3.0 , how can I do the following? Delete Swift 3.0 Chinese traditional C style for After the cycle , How do I do the following ？

for (i = 1; i < max; i+=2) {    // Do something}

In Python, the for-in control flow statement has an optional step value: stay Python in ,for-in The control flow statement has an optional step value ：

for i in range(1, max, 2):    # Do something

But the Swift range operator appears to have no equivalent: however Swift The range operator seems to have no equivalent ：

for i in 1..<max {    // Do something}

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Solution ：

Reference resources ： https://stackoom.com/en/question/2PBxa