IOS UIswitch基本使用

- (void)viewDidLoad {
    [super viewDidLoad];
    
    CGRect screen = [[UIScreen mainScreen] bounds];
    
    CGFloat switchScreenSpace = 39;
    
    self.rightSwitch = [[UISwitch alloc] init];
    CGRect frame = self.rightSwitch.frame;
    frame.origin = CGPointMake(switchScreenSpace, 98);
    
    self.rightSwitch.frame = frame;
    self.rightSwitch.on = TRUE;
    
    [self.rightSwitch addTarget:self action:@selector(switchValueChanged:) forControlEvents:UIControlEventValueChanged];
    
    [self.view addSubview:self.rightSwitch];
    
    
    self.leftSwitch = [[UISwitch alloc] init];
    frame = self.leftSwitch.frame;
    frame.origin = CGPointMake(screen.size.width - (frame.size.width + switchScreenSpace), 98);
    
    self.leftSwitch.frame = frame;
    self.leftSwitch.on = TRUE;
    
    [self.leftSwitch addTarget:self action:@selector(switchValueChanged:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview: _leftSwitch];
}

- (void)switchValueChanged: (id)sender{
    UISwitch *whichSwitch = (UISwitch *)sender;
    BOOL setting = whichSwitch.isOn;
    [_leftSwitch setOn:setting animated:TRUE];
    [_rightSwitch setOn:setting animated:TRUE];
    
}