Im new to programming and need some help here I have created a signup page in swift with some text fields and buttons for names, passwords. I have added a UIImage for users to add their picture. I want each users to MUST include a picture to be able to signup.
if (user does not include picture empty) <--- code here {
var alert = UIAlertController(title: "Warning", message: "you need to add profile picture", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title:"ok", style:UIAlertActionStyle.Default, handler:nil))
self.presentViewController(alert, animated: true, completion: nil)
}
thank you.
You can check this way if imageView is nil or not:
if yourImageView.image == nil {
var alert = UIAlertController(title: "Warning", message: "you need to add profile picture", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "ok", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
Related
I have a UIAlertController in which the options are populated from an array and are presented to the user. The user then selects an option from the alert. After this, I have a separate alert that provides the user with a confirmation message that has an okay button.
myAlert.addAction(UIAlertAction.init(title: item, style: .Default, handler: {
(UIAlertAction) in
self.chosenBusiness.append(businessNameData[item]!)
}))
self.presentViewController(myAlert, animated: true, completion: nil)
The code above gathers the data from the array and pushes it into actions in myAlert. The code above is inside of a for loop.
After this I use a function to retrieve the topmost view controller, and then push the next alert.
let top = topMostController()
let alertController = UIAlertController(title: "Location pinned", message: "You've successfully pinned this location, good work!", preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) {
(result : UIAlertAction) -> Void in
print("OK")
}
alertController.addAction(okAction)
self.presentViewController(myAlert, animated: true, completion: nil)
top.presentViewController(alertController, animated: true, completion: {
_ in
})
The error I receive is:
Attempting to load the view of a view controller while it is
deallocating and is not allowed and may result in undefined behavior.
UIAlertController: 0x1535b1cd0.
Can someone help me with this?
I think this is what you are looking for. The second must be called with the dismissal action of the first. Also, anytime you work with UI, It is safer to use dispatch_async(dispatch_get_main_queue()) {
\\code }
than not if you are not positive you are currently on the main queue.
let firstAlertController = UIAlertController(title: "First", message: "This is the first message.", preferredStyle: UIAlertControllerStyle.Alert)
let secondAlertController = UIAlertController(title: "Second", message: "This is the second message.", preferredStyle: UIAlertControllerStyle.Alert)
let secondDismissAction = UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.Default, completion: nil)
secondAlertController.addAction(secondDismissAction)
let firstDismissAction = UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.Default) {
UIAlertAction in
dispatch_async(dispatch_get_main_queue()) {
self.presentViewController(secondAlertController, animated: true, handler: nil)
}
}
firstAlertController.addAction(firstDismissAction)
self.presentViewController(firstAlertController, animated: true, completion: nil)
I'm trying to display a message to my users with alert controller but it wont show
let alert = UIAlertController(title: "Error", message: "Incorrect username/password", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "okay", style: UIAlertActionStyle.Default, handler: nil))
looks like you haven't presented it yet. paste this code where you want to show the alert
self.present(alert, animated: true, completion: nil)
I have a screen with a collection view of items. If the user has not selected anything, I want an alert to pop up, prompting them to choose something. If they have chosen something, I want an alert to pop up, asking if they are ready to move on? Below is my code for this:
if (isSelected) {
// create the alert
let alert = UIAlertController(title: "Create", message: "Make sure to select at least one item.", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Cancel, handler: { action in
alert.dismissViewControllerAnimated(true, completion: nil)
}))
self.presentViewController(alert, animated: true, completion: nil)
} else {
let alert2 = UIAlertController(title: "Move on", message: "Are you ready to move on?", preferredStyle: UIAlertControllerStyle.Alert)
alert2.addAction(UIAlertAction(title: "Yes", style: UIAlertActionStyle.Default, handler: { action in
self.performSegue to next screen
}))
n.addAction(UIAlertAction(title: "No", style: UIAlertActionStyle.Cancel, handler: { action in
}))
}
The code seems to be fine but i get the following error:
Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior
This seems like it should work pretty easily and a common thing to do, but there is no solution on line to this problem. Any help/guidance would be much appreciated.
you had missed to present the alert2
self.presentViewController(alert2, animated: true, completion: nil)
Add that and it will work fine.
This line is not required:
alert.dismissViewControllerAnimated(true, completion: nil)
Also add
self.presentViewController(alert, animated: true, completion: nil)
in else part.
I'm trying to make a UIAlertView on my Parse app but for some reason every time I run it, it crashes and I'm taken to ApplicationDelegate where I get a SIGABRT. Here is my alert code, I'm pretty sure I'm not doing anything wrong because it's worked before... Is it because I'm loading data into a tableview from Parse?
func displayAlert(title: String, message: String) {
var alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: { (action) -> Void in
}))
presentViewController(alert, animated: true, completion: nil)
}
Not sure what your issue is. You could simplify the code as follows (Xcode 7b6) by eliminating the empty closure and shortening the arguments when possible. But I don't think this is your problem. Instead, you should show the code where you call this function.
var alert = UIAlertController(title: title, message: message, preferredStyle: .Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
presentViewController(alert, animated: true, completion: nil)
I am using UIAlertView to display alert and it is working for first time that when i click alert appears but when second time i do it then on clicking twice alert gets displayed instead of 1st click.
During secong time "visited full" gets printed on 1st click but alert appears on 2click, Why does this appear?Please help me to resolve.Thanks in advance
println("visited full")
var alert:UIAlertView = UIAlertView(title: "Video", message: "You have played all videos", delegate: self, cancelButtonTitle: "OK")
alert!.show()
IF it doesn't work then try this may be this will work.
let alert = UIAlertController(title: "Video", message: "You have played all videos", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
EDIT:
I think you can use it like this way too:
dispatch_async(dispatch_get_main_queue(), {
var alert:UIAlertView = UIAlertView(title: "Video", message: "You have played all videos", delegate: self, cancelButtonTitle: "OK")
alert.show()
})
and for UIAlertController
dispatch_async(dispatch_get_main_queue(), {
let alert = UIAlertController(title: "Video", message: "You have played all videos", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
})