UITextfield leftView/rightView padding on iOS7

A much simpler solution, which takes advantage of contentMode:

    arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"down_arrow"]];
    arrow.frame = CGRectMake(0.0, 0.0, arrow.image.size.width+10.0, arrow.image.size.height);
    arrow.contentMode = UIViewContentModeCenter;

    textField.rightView = arrow;
    textField.rightViewMode = UITextFieldViewModeAlways;

In Swift 3,

    let arrow = UIImageView(image: UIImage(named: "arrowDrop"))
    if let size = arrow.image?.size {
        arrow.frame = CGRect(x: 0.0, y: 0.0, width: size.width + 10.0, height: size.height)
    }
    arrow.contentMode = UIViewContentMode.center
    self.textField.rightView = arrow
    self.textField.rightViewMode = UITextFieldViewMode.always

Was just working on this myself and used this solution:

- (CGRect) rightViewRectForBounds:(CGRect)bounds {

    CGRect textRect = [super rightViewRectForBounds:bounds];
    textRect.origin.x -= 10;
    return textRect;
}

This will move the image over from the right by 10 instead of having the image squeezed up against the edge in iOS 7.

Additionally, this was in a subclass of UITextField, which can be created by:

1. Create a new file that's a subclass of UITextField instead of the default NSObject

2. Add a new method named - (id)initWithCoder:(NSCoder*)coder to set the image

   - (id)initWithCoder:(NSCoder*)coder {
       self = [super initWithCoder:coder];
   
       if (self) {
   
           self.clipsToBounds = YES;
           [self setRightViewMode:UITextFieldViewModeUnlessEditing];
   
           self.leftView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"textfield_edit_icon.png"]];
       }
   
       return self;
   }
   

3. You may have to import #import <QuartzCore/QuartzCore.h>

4. Add the rightViewRectForBounds method above

5. In Interface Builder, click on the TextField you would like to subclass and change the class attribute to the name of this new subclass