material-components_material-components-ios/components/TextControls/docs/examples.md

Creating a text field

Swift

let estimatedFrame = ...
let textField = MDCFilledTextField(frame: estimatedFrame)
textField.label.text = "This is the floating label"
textField.leadingAssistiveLabel.text = "This is helper text"
textField.sizeToFit()
view.addSubview(textField)

Objective-C

CGRect estimatedFrame = ...
MDCOutlinedTextField *textField = [[MDCOutlinedTextField alloc] initWithFrame:estimatedFrame];
textField.label.text = "This is the floating label";
textField.leadingAssistiveLabel.text = "This is helper text";
[textField sizeToFit];
[view addSubview:textField];