Objective-C

[objectArray enumerateObjectsUsingBlock: ^( Object * object,
                                            NSUInteger index,
                                            BOOL * stop )
{
	object.name = @"same name";
}

Swift (Indirectly access objects using index)

struct Object
{
	var name: Name?
}

for index in 0..<objectArray.count
{
	var object = objectArray[index]
	object.name = "same name"
}

Swift *** Error ***
"Cannot assign to 'name' in 'object'"

for object in objectArray
{
	object.name = "same name"
}