try this
UITextField *emailTextField;
emailTextField.autocapitalizationType = UITextAutocapitalizationTypeNone;
if still not working, Go to Device Setting->General->Keyboard->Auto-Capitalization (should be off)
try this
UITextField *emailTextField;
emailTextField.autocapitalizationType = UITextAutocapitalizationTypeNone;
if still not working, Go to Device Setting->General->Keyboard->Auto-Capitalization (should be off)