Xcode随机变量不起作用

Question

I'm using Xcode 7.3.1 and Swift, and i'm trying to set a random number between 1 and 50 like that: variableName = random()%50

Then i have to move an ImageView in the Y axe of that random value: imageviewName.center.y = imageviewName.center.y - variableName

But it gives me the following error: "cannot convert value of type 'int' to expected argument type 'CGFloat'.

So I declared the variable like that: var RandomSquirrel2 = CGFloat() but it still doesn't wok.

How can I generate a random number in Swift?

Answer 1

您需要将Int转换为CGFloat

 imageviewName.center.y = imageviewName.center.y - CGFloat(variableName)

Answer 2

You need to cast variableName to CGFloat. because random() returns an Int and not A CGFloat.

 imageviewName.center.y = imageviewName.center.y - CGFloat(variableName)