Swift空循环数组

Question

即使＆＃34;对象＆＃34;执行进入for循环也是如此。是空的。我疯了吗？

query?.findObjectsInBackgroundWithBlock({ (objects:[PFObject]?, error:NSError?) -> Void in
        if error == nil {
            for object:PFObject? in objects! {
                //Do something
            }
        } else {
            NSLog("something's wrong")
        }
    })

Answer 1

应该是

for object:PFObject in objects!   //instead of "PFObject?"

一定是因为PFObject？可以从值为nil的空“对象”数组中获取并且它进入那里。它也变成了无限循环。试过PFObject！它仍然会进入那里......