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[SkylarEC]

To have the text field show asterisks, add this line when you create the text field (or wherever)
yourTextField.secureTextEntry = YES;


Changing the button image is as simple as assigning a different image for the pressed control state.

[signInButton setImage:[UIImage imageNamed:@"button_signin.png"] forState:UIControlStateNormal];
[signInButton setImage:[UIImage imageNamed:@"yourOtherButtonpng"] forState:UIControlStateHighlighted];