Usage of where in if let assignment in Swift
Solution 1:
In Swift 3 this syntax has changed.
What was
if let x = y, a = b where a == x {
Is now
if let x = y, let a = b, a == x {
The justification is that each sub-clause of the if ... {
is now an independent boolean test.
See the Xcode Release notes & the Swift Evolution proposal for more info about this change.
Solution 2:
Example with two conditions
if let x = y, let a = b, a == x && !x.isEmpty {
Solution 3:
In xcode 9
if let str = textField.text as String!, !str.isEmpty
{
params[key] = str
TextFieldHelper.setup(textField: textField)
}
else
{
TextFieldHelper.error(textField: textField)
}