Question

有没有办法循环＆＃34;如果＆＃34;声明使用javascript / jquery，例如

 override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    self.collectionView?.setPresenting(true, animated: true, completion: nil)
    let delegate = UIApplication.sharedApplication().delegate as! AppDelegate
    self.selectedCard = delegate.otherCards[indexPath.row]
    self.performSegueWithIdentifier("SegueToView_B", sender: self)
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if let identifier = segue.identifier {
        if identifier == "SegueToView_B" {
            let myOtherCardViewController = segue.destinationViewController as? View_BViewController
            myOtherCardViewController!.otherCard = self.selectedCard
            myOtherCardViewController!.navigationItem.backBarButtonItem?.tintColor = UIColor.whiteColor()  // Failed to work!!!
            myOtherCardViewController?.navigationItem.leftBarButtonItem?.tintColor = UIColor.whiteColor()  // Failed to work, too!!!
        }
    }
}

使用上面的代码，它会检查一次，但无论第二个答案是什么，它都不会检查，有没有办法让它重复检查，而不用写10亿次if语句......？

Answer 1

使用“while”循环。

var name = prompt("What's your name?");
while (name === '') {
    name = prompt("Try again");
    alert(name);
}

循环IF声明

1 个答案: