“Cannot assign to property: ”any“ is immutable” error

问题

tiledViewsStack contains UIImageViews. I'm trying to give each UIImageView in the array a new center coordinate. Not sure why I'm getting this error for the last line in the for loop...

    var tiledViewsStack = [AnyObject]()

    var randLocInt = Int()
    var randLoc = CGPoint()

    for var any in tiledViewsStack
    {
        randLocInt = Int((arc4random()*10) % 9) // 0, --- 8
        randLoc = allCenters[randLocInt].CGPointValue()
        any.center = randLoc
    }

回答1:

Needed to make tiledViewsStack a stack of UIImages, not AnyObjects. Changed var tiledViewsStack = [AnyObject]() to var tiledViewsStack = [UIImageView]().

回答2:

When you use Anyobject, you are using a protocol.

It can be an istance of any type. So AnyObject can represent an Int, a Float, a String, a UIView, anything.

The array [AnyObject] is a nonspecific type to represent any type of class. In you code you initialize an always immutable array, and when you try to modify each element you get the error..

The correct way to declare and initialize a type of this array is:

var genericTypeArray : [AnyObject] = [1, true, 1.2, "hello"]

For you code, you must change :

var tiledViewsStack = [AnyObject]()

with a code like my example up, or you modify AnyObject class with a specified class like UIImageView as recommended in comments.

来源：https://stackoverflow.com/questions/36525393/cannot-assign-to-property-any-is-immutable-error