How to left align UISearchBar placeholder text

Based in Mohittomar answer, as asked by @DevC to add spaces to the end of the place holder, here the code in swift:

I subclass placeholder in the UISearchBar, after set the value, I check if the last character is a space. then get the size of one space and how many spaces I need to add to align left.

class SearchBar: UISearchBar, UISearchBarDelegate {
override var placeholder:String? {
    didSet {
        if let text = placeholder {
            if text.last != " " {

// get the font attribute
                let attr = UITextField.s_appearanceWhenContainedIn(SearchBar).defaultTextAttributes
// define a max size
                let maxSize = CGSizeMake(UIScreen.mainScreen().bounds.size.width - 60, 40)
// get the size of the text
                var widthText = text.boundingRectWithSize( maxSize, options: .UsesLineFragmentOrigin, attributes:attr, context:nil).size.width
// get the size of one space
                var widthSpace = " ".boundingRectWithSize( maxSize, options: .UsesLineFragmentOrigin, attributes:attr, context:nil).size.width
                let spaces = floor((maxSize.width - widthText) / widthSpace)
// add the spaces
                let newText = text + (" " * spaces)
// apply the new text if nescessary
                if newText != text {
                    placeholder = newText
                }
            }
        }
    }
}

Don't use a UISearchBar if you need to do these kinds of customizations. You'll have to make your own using a UITextField and a UIImageView, and responding to the delegate calls.