Position of rightView UITextField

@Puneet Sharma's answer was great but that would give the need to create a class that would subclass UITextField, what I did instead was create a UIView that would act as a padding.

This code works without the need to subclass

Here's my code, although it's written in Swift 3

// this is the view I want to see on the rightView
let checkImageView = UIImageView(image: UIImage(named: "check24.png"))
checkImageView.frame = CGRect(x: 0, y: 0, width: 24, height: 24)
checkImageView.curveEdges(12)
checkImageView.contentMode = .scaleAspectFit

// declare how much padding I want to have
let padding: CGFloat = 6

// create the view that would act as the padding
let rightView = UIView(frame: CGRect(
    x: 0, y: 0, // keep this as 0, 0
    width: checkImageView.frame.width + padding, // add the padding
    height: checkImageView.frame.height)) 
rightView.addSubview(checkImageView)

// set the rightView UIView as the textField's rightView
self.textField.rightViewMode = .whileEditing
self.textField.rightView = rightView

What happened here is, that the rightView which is a UIView that has a transparent colored background which then gave the illusion that there is a padding whereas there is not.

The right overlay view is placed in the rectangle returned by the rightViewRectForBounds: method of the receiver.

So I suggest you subclass UITextField and override this method, something like this:

@interface CustomTextField: UITextField

@end

@implementation CustomTextField

// override rightViewRectForBounds method:
- (CGRect)rightViewRectForBounds:(CGRect)bounds{
    CGRect rightBounds = CGRectMake(bounds.origin.x + 10, 0, 30, 44);
    return rightBounds ;
}