我试图在用户点击登录按钮时显示活动指示器。如果我将startActivityIndicator()
代码放在viewDidLoad()
中,它将完全按照预期显示在屏幕上。当我将它作为btnSignIn()
的第一步执行时,它永远不会出现。有点失落,所以我希望堆栈大师的帮助......执行时未显示活动指示器
// Here are the variable declarations
var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()
var loadingView: UIView = UIView()
var viewCenter:CGPoint!
@IBAction func btnSignIn(sender: AnyObject) {
startActivityIndicator()
if validateEmailAddress(txtEmailAddress.text!) == false {
stopActivityIndicator(self.loadingView)
return
}
if validatePassword(txtPassword.text!) == false {
stopActivityIndicator(self.loadingView)
return
}
PFUser.logInWithUsernameInBackground(txtEmailAddress.text!, password:txtPassword.text!) {
(user: PFUser?, error: NSError?) -> Void in
if user != nil {
// Successful login.
self.txtPassword.resignFirstResponder()
self.txtEmailAddress.resignFirstResponder()
self.getUserInfo()
} else {
self.stopActivityIndicator(self.loadingView)
// The login failed. Display alert.
self.displayAlert("Whoops!", message: "Email or Password are incorrect.")
}
}
}
func startActivityIndicator() {
loadingView.frame = CGRectMake(0, 0, 80, 80)
loadingView.center = viewCenter
print(viewCenter)
loadingView.backgroundColor = UIColorFromRGB("444444", alpha: 0.7)
loadingView.clipsToBounds = true
loadingView.layer.cornerRadius = 10
activityIndicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0);
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge
activityIndicator.center = CGPointMake(loadingView.frame.size.width/2, loadingView.frame.size.height/2);
view.addSubview(loadingView)
loadingView.addSubview(activityIndicator)
UIApplication.sharedApplication().beginIgnoringInteractionEvents()
activityIndicator.startAnimating()
}
func stopActivityIndicator(uiView: UIView) {
activityIndicator.stopAnimating()
loadingView.removeFromSuperview()
UIApplication.sharedApplication().endIgnoringInteractionEvents()
}
@AnthonyDito UIActivityIndicatorView没有方法startActivityIndicator() –
@AnthonyDito我想这就是你的意思。不过他已经在调用这种方法了。 –
这很奇怪...调用方法就像我在viewDidLoad()中做的一样,没有问题。 – Robert