[移动开发]【Swift 60秒】23 - Conditions

0x00 Lesson

Now you know some operators you can write conditions using if statements. You give Swift a condition, and if that condition is true it will run code of your choosing.

To try this out, I want to use a Swift function called print(): you run it with some text, and it will be printed out.

We can use conditions to check for a winning Blackjack hand:

let firstcard = 11
let secondCard = 10
if firstCard + secondCard == 21 {
	print ("Blackjack!")
}	

The code inside the braces - { and } - will be printed if the condition is true. If you want you can provide alternative code to run if the condition is false, using else:

if firstCard + secondCard == 21 {
	print("Blackjack!")
} else {
	print("Regular cards")
}	

You can also chain conditions together using else if:

if firstCard + secondcard == 2 {
	print( "Aces lucky!")
} else if firstCard + secondcard == 21 {
	print ("Blackjack!")
} else {
	print ("Regular cards")
}

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