How can I get the iOS 7 default blue color programmatically?

Use self.view.tintColor from a view controller, or self.tintColor from a UIView subclass.

It appears to be [UIColor colorWithRed:0.0 green:122.0/255.0 blue:1.0 alpha:1.0].

iOS 7 default blue color is R:0.0 G:122.0 B:255.0

UIColor *ios7BlueColor = [UIColor colorWithRed:0.0 green:122.0/255.0 blue:1.0 alpha:1.0];