Custom UISwitch with image

As gasparuff says, you can also do it with a UIButton, just set the images:

[button setImage:[UIImage imageNamed:@"image_on"] forState:UIControlStateSelected];
[button setImage:[UIImage imageNamed:@"image_off"] forState:UIControlStateNormal];

and when it's tapped just toggle the selected property.

- (void) buttonTap {
    button.selected = !button.selected;
}

Which will change the images automatically.

It's not hard to create your own switch. A UISwitch is a control — essentially just a view that sends a message — with two states. You could set it up your own custom control like this:

• container view: a simple view with rounded corners (set the cornerRadius of the view's layer) and a background color

• left image: an image view that displays the image you want to show on the left side, i.e. the check mark for your example

• right image: an image view that displays the image you want to show on the right side, i.e. the X mark for your example

• slider: an image view showing the slider portion of the switch, set above the other two image views

When the user taps or swipes the control, use Core Animation to move the slider to the other side of the switch and update the state of the control and do a quick fade to the background color for the new state. Send the control's action to the target.

You know about -[UISwitch setOnImage:] and -[UISwitch setOffImage:], right? Also -[UISwitch setTintColor]. About the only drawback I can see is that the switch, itself, will be the standard iOS switch (round button) but, otherwise, this would be the most-iOS-like solution.

When implementing your own on/offImage, remember the size restrictions, and also that the side of the image toward the switch is concave. tintColor can be used to make the rest of the switch reflect your color scheme. You might want to track the valueChanged event so alter the tint color.

If you need the exact look you display in your question (square switch button), then you probably want to use a custom control, as @Caleb suggested.