158，开关按钮，滑块按钮和分段按钮

#import "ViewController.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutletUISwitch *switchBtn1;

@property (weak, nonatomic) IBOutletUISwitch *switchBtn2;

@property (weak, nonatomic) IBOutletUILabel *silderValue;

@end

@implementation ViewController

- (IBAction)switchValueChanged:(UISwitch *) switchBtn{

        BOOL set =switchBtn.isOn;

        [self.switchBtn1setOn:set animated:YES];

        [self.switchBtn2setOn:set animated:YES];

}

- (IBAction)changeSilderValue:(UISlider *)slider {

    self.silderValue.text = [NSStringstringWithFormat:@"%lf",slider.value];

}

- (IBAction)changeSegment:(UISegmentedControl *)segment {

    NSLog(@"segment.index = %lu",segment.selectedSegmentIndex);

}

@end