How to check nil string in if condition swift - ios

Question

So when I press the button I check if both the UITextField and the UITextView have some value inside them, but if they are nil then perform this.
So I tried this, but it didn't work:
#IBOutlet weak var defTextView = UITextView
#IBAction func btnTapped(sender: UIButton) {
if let definitionName = defTextView.text {
print(definitionName)
} else {
print("nil")
}
}
Instead of receiving the word "nil" I got empty Strings bring printed

Answer 1

defTextView.text is empty String "" instead of nil.
Try where clause to check if it is empty:
#IBOutlet weak var defTextView = UITextView
#IBAction func btnTapped(sender: UIButton) {
if let definitionName = defTextView.text where !definitionName.isEmpty {
print(definitionName)
} else {
print("nil")
}
}

Answer 2

Your code should work, however, remember that an empty string is not nil. A UITextView's text is unlikely to be nil, so I would use an if statement to check if it is an empty string, as well as than if let unwrapping.
For example, use this instead:
if let defenitionName = defTextView.text where defTextView.text != nil {
print(definitionName)
} else {
print("none") //Not necessarily nil.
}

Answer 3

try following code
if defTextView.text != nil || !(defTextView.text == "") {
print(definitionName)
} else {
print("nil")
}

Answer 4

The question is actually meaningless because the text of a text view is never nil.
According the documentation the property text of UITextView is an implicit unwrapped optional - unlike UILabel whose text can be nil.
So it's guaranteed to be not nil when it's used and you need only to check for an empty string, optional binding or != nil is not needed.
#IBAction func btnTapped(sender: UIButton) {
let definitionName = defTextView.text
if definitionName.isEmpty {
print("definitionName is empty")
} else {
print("definitionName is not empty")
}
}