我遇到xCode问题。我有一个为马创建动画的代码，但动画不会启动。
动画由NSTimer启动。
/********************** background *************************/
var imBackGroundView: UIImageView!
// override let imBackGroundView: Int
func runMe0002() {
if (self.imBackGroundView == nil) {
self.view.backgroundColor = UIColor(patternImage: UIImage(named:
background[Int(arc4random_uniform(UInt32(background.count)))])!)
//background = arrow as String and it works normally...
} //bracket if
else if (self.view.backgroundColor == "bk0001.jpg")
// it was tested as == 0 as index of arrow...
// if else remove and keep only if - at end of block else snap into action...
{
/*************** contlol animation (tested...) *****************/
use = UIImageView(frame:CGRectMake(360, 200, 600,80))
use.image = UIImage(named: "use0002.png")
self.view.addSubview(use)
UIView.animateWithDuration(1.0, animations: {
self.use.frame = CGRect(x: -670, y: 200, width: 600, height: 80) }, completion: nil)
} // bracket else if */
else {
print("don't want start...") // not print...in other words = else if works... as seems...
}
} // bracket func runMe0002
我无法理解为什么这不起作用。