swift - '[AnyObject] ?' does not have a member named ' 生成器'

Question

我正在为一个游戏循环遍历所有接触的物理体，但在使用 AnyObject 时遇到了这个奇怪的错误。
var bodies = island1.island.physicsBody?.allContactedBodies()
对于 body :AnyObject？在正文中 {}

Answer 1

bodies 这里是可选的。你必须先打开它，然后才能对其进行迭代。

if let bodies = island1.island.physicsBody?.allContactedBodies() {
    for body in bodies {
        // etc
    }
} else {
    println("There were no bodies")
}