Answers:
使用此代码解决iOS中的开关中的开/关状态问题
- (IBAction)btnSwitched:(id)sender {
    UISwitch *switchObject = (UISwitch *)sender;
    if(switchObject.isOn){
        self.lblShow.text=@"Switch State is Disabled";
    }else{
        self.lblShow.text=@"Switch State is Enabled";
    }                ViewController.h
- (IBAction)switchAction:(id)sender;
@property (strong, nonatomic) IBOutlet UILabel *lbl;ViewController.m
- (IBAction)switchAction:(id)sender {
    UISwitch *mySwitch = (UISwitch *)sender;
    if ([mySwitch isOn]) {
        self.lbl.backgroundColor = [UIColor redColor];
    } else {
        self.lbl.backgroundColor = [UIColor blueColor];   
    }
}
UISwitch *switchObject = (UISwitch *)sender;