Remove Border of UISearchBar in iOS7

Setting searchBarStyle to UISearchBarStyleMinimal messed up my color setup, so doing this instead fixed the issue.

[self.searchField setBackgroundImage:[[UIImage alloc]init]];

For those looking for this option in Swift 4:

searchField.setBackgroundImage(UIImage(), for: .any, barMetrics: UIBarMetrics.default)

Set Search Style = minimal in Search Bar properties in IB

Swift:
searchBar.searchBarStyle = UISearchBarStyleMinimal;

Swift 3:
searchBar.searchBarStyle = .minimal;

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