开关的可配置选项很少，一般用于处理布尔值。
下面给出一个小Demo，创建两个开关，开关一可以控制开关二的可用与否，两者的关系就相当于水闸与水龙头的关系。
#import "ViewController.h"
@interface ViewController ()
@property(nonatomic,strong) UISwitch *swicth1;
@property(nonatomic,strong) UISwitch *switch2;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UISwitch *swicth1 = [[UISwitch alloc] initWithFrame:CGRectMake(100, 100, 0, 0)];
self.swicth1 = swicth1;
[swicth1 addTarget:self action:@selector(clickSwitch) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:swicth1];
UISwitch *switch2 = [[UISwitch alloc] initWithFrame:CGRectMake(100, 200, 0, 0)];
self.switch2 = switch2;
[switch2 addTarget:self action:@selector(clickSwitch) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:switch2];
}
- (void)clickSwitch {
//switch1控制switch2的可用与否
self.switch2.userInteractionEnabled = self.swicth1.on;
}