Swift isKindOfClass not work - ios

Question

I have a ViewController and some label and textfield for user to input, and in some point I need to loop over all textfield to collect the user's input.
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.configureView()
for views in self.view.subviews {
if view is UITextField
{
println("inside")
}
println(views.description)
}
}
For this code, the "inside" never print out. But I do see some the information of views.description
<UILabel: 0x7fa4b1c7bd00; frame = (16 97; 76 21); text = 'FromDate'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7fa4b1c44580>>
<UILabel: 0x7fa4b1c9fd60; frame = (16 169; 82 21); text = 'ControlNO'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7fa4b1c77fb0>>
>
<UITextField: 0x7fa4b1c7a050; frame = (106 95; 197 30); text = ''; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x7fa4b1c6c800>>
<UITextField: 0x7fa4b1c9c060; frame = (106 126; 197 30); text = ''; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; tag = 1; layer = <CALayer: 0x7fa4b1c9c2c0>>
<_UILayoutGuide: 0x7fa4b1d11d20; frame = (0 0; 0 0); hidden = YES; layer = <CALayer: 0x7fa4b1d11e00>>
<_UILayoutGuide: 0x7fa4b1d253f0; frame = (0 0; 0 0); hidden = YES; layer = <CALayer: 0x7fa4b1d12f60>>
but if I println(views.dynamicType) I could only see ExistentialMetatype.
What is wrong in my code?

Answer 1

The loop variable is called views, but you test view (which is
not the loop variable and therefore identical to self.view):
for views in self.view.subviews { // "views" here
if view is UITextField { // "view" here
println("inside")
}
}
If you rename the loop variable to view
for view in self.view.subviews {
if view is UITextField {
println("inside")
}
}
then everything works as expected.

Answer 2

You can use isKindOfClass:
var tex = UITextField()
if tex.isKindOfClass(UITextField){
println("yes")
}

Answer 3

#Christian's code will work. Here is another solution.
if let view = tex as? UITextField {
// view is a UITextField
}