UISwitch不能修改大小，只能设置缩放
_swith.transform = CGAffineTransformMakeScale(0.8, 0.8);
tintColor设置这个颜色，只是对外观进行设置，但是里面的背景色不起作用
_swith.onTintColor = UIColorMakeWithHex(@"#F54440");
_swith.tintColor = UIColorMakeWithHex(@"#EBEBEB");
_swith.backgroundColor = UIColorMakeWithHex(@"#EBEBEB");
_swith.layer.cornerRadius = 15;
_swith.layer.masksToBounds = YES;
_swith.transform = CGAffineTransformMakeScale(0.8, 0.8);
