我在最新的xcode7.2中viewDidLoad里使用center.x -= self.view.bounds.width的时候发现不能移动元素的位置，反而百度了下发现用alpha＝0让元素隐藏起来，在viweDidAppear里再把alpha改回1执行动画效果，效果实现了，但是不知道center.x那种方式有什么问题
//self.dot.center.x -= self.view.bounds.width/2 //Not effective
self.dot.alpha = 0
//self.logo.center.x -= self.view.bounds.width //Not effective
self.logo.alpha = 0
2015-12-13
@IBOutlet weak var bubble1: UIImageView!
@IBOutlet weak var bubble2: UIImageView!
@IBOutlet weak var bubble3: UIImageView!
@IBOutlet weak var bubble4: UIImageView!
@IBOutlet weak var bubble5: UIImageView!
@IBOutlet weak var dot: UIImageView!
@IBOutlet weak var logo: UIImageView!
@IBOutlet weak var username: UITextField!
@IBOutlet weak var password: UITextField!
@IBOutlet weak var login: UIButton!
//custom
let spinner = UIActivityIndicatorView(activityIndicatorStyle: .White)
override func viewDidLoad() {
super.viewDidLoad()
self.bubble1.transform = CGAffineTransformMakeScale(0, 0)
self.bubble2.transform = CGAffineTransformMakeScale(0, 0)
self.bubble3.transform = CGAffineTransformMakeScale(0, 0)
self.bubble4.transform = CGAffineTransformMakeScale(0, 0)
self.bubble5.transform = CGAffineTransformMakeScale(0, 0)
//self.dot.center.x -= self.view.bounds.width/2 //Not effective
self.dot.alpha = 0
//self.logo.center.x -= self.view.bounds.width //Not effective
self.logo.alpha = 0
let usernamePaddingView = UIView(frame: CGRectMake(0, 0, 40,40))
let passwordPaddingView = UIView(frame: CGRectMake(0, 0, 40,40))
self.username.leftView = usernamePaddingView
self.username.leftViewMode = .Always
self.password.leftView = passwordPaddingView
self.password.leftViewMode = .Always
let userImageView = UIImageView(image: UIImage(named: "user"))
userImageView.frame.origin = CGPoint(x: 11, y: 11)
self.username.addSubview(userImageView)
//self.username.center.x -= self.view.bounds.width //Not effective
self.username.alpha = 0
let keyImageView = UIImageView(image: UIImage(named: "key"))
keyImageView.frame.origin = CGPoint(x: 11, y: 11)
self.password.addSubview(keyImageView)
//self.password.center.x -= self.view.bounds.width //Not effective
self.password.alpha = 0
self.login.alpha=0
}
刚学了一点，看着视频做了一遍，然后删了自己在做了一遍，百度了下，发现改透明度可以实现
举报
