在Swift中返回布尔值时收到错误消息

Question

I have this function:

func isDrawRadiusEnough(let point: CGPoint) -> Bool {
    let distance = sqrtf(powf(point.x-lastPointDrawn.x, 2)+powf(point.y-lastPointDrawn.y, 2))

    return distance > drawRadius // Error: Could not find an overload for '>' that accepts the supplied arguments
}

drawRadius is an Int and is a property in the same class as the function. lastPointDrawn is a CGPoint and is also a property.

When I set the drawRadius as a Float the error disappears, but I don't want it to be a float. In Obj-C this was valid but it is not in Swift. Anyone know a workaround?

Answer 1

sqrtf returns a Float value.

Since drawRadius is an Int , you need to convert it to a Float prior to performing the compare operation.

Try return distance > Float(drawRadius)

This is due to Swift's implementation of type safety. No implicit type conversions are performed.