Swift, Xcode - Increasing the size of a UISwitch

According to this answer by the user mxg, just use the following code:

 mySwitch.transform = CGAffineTransformMakeScale(0.75, 0.75)

Of course, you have to change mySwitch to whatever the name of your variable/IBOutlet is.

Xcode 9.2 & Swift 4

switch.transform = CGAffineTransform(scaleX: 0.75, y: 0.75)

Making a custom one is simple. If you need ideas on how to do so, or would just like to use the one I wrote, try SwiftySwitch. It allows for a good bit more customization than the default UISwitch gives you, and you get direct access to all of it on the storyboard.

I don't recommend the other ways because Apple does not like having their tools altered in ways they were not meant to be.

Swift 3 / 4:

switch.transform = CGAffineTransform(scaleX: 0.75, y: 0.75)