You would like to present a few options to your users from which they can pick an

option, through a UI that is compact, simple, and easy to understand.

 

effect:

 

 1. declare control

#import "ViewController.h"@interface ViewController ()@property (nonatomic, strong) UISegmentedControl *mySegmentedControl;@end@implementation ViewController

 

 2. create the segmented control in the viewDidLoad method of your view controller

- (void)viewDidLoad {  [super viewDidLoad];  NSArray *segments = [[NSArray alloc] initWithObjects:        @"iPhone",        @"iPad",        @"iPod",        @"iMac", nil];  self.mySegmentedControl = [[UISegmentedControl alloc]                                            initWithItems:segments];  self.mySegmentedControl.center = self.view.center;  [self.view addSubview:self.mySegmentedControl]; }

3. use the addTarget:action:forControlEvents: method of the segmented control to

　　recognize when the user selects a new option

   // add event listener

  [self.mySegmentedControl addTarget:self

      action:@selector(segmentChanged:)

      forControlEvents:UIControlEventValueChanged];

 

- (void)viewDidLoad {  [super viewDidLoad];  NSArray *segments = @[    @"iPhone",    @"iPad",    @"iPod",    @"iMac"  ];    self.mySegmentedControl = [[UISegmentedControl alloc]                              initWithItems:segments];  self.mySegmentedControl.center = self.view.center;  [self.view addSubview:self.mySegmentedControl];  [self.mySegmentedControl addTarget:self         action:@selector(segmentChanged:)         forControlEvents:UIControlEventValueChanged];}

 

4. segment change event

- (void) segmentChanged:(UISegmentedControl *)paramSender {  if ([paramSender isEqual:self.mySegmentedControl]) {    NSInteger selectedSegmentIndex = [paramSender   selectedSegmentIndex];     NSString *selectedSegmentText =       [paramSender titleForSegmentAtIndex:selectedSegmentIndex];    NSLog(@"Segment %ld with %@ text is selected",             (long)selectedSegmentIndex,              selectedSegmentText);  }}

 

result on console:

Segment 0 with iPhone text is selected

Segment 1 with iPad text is selected

Segment 2 with iPod text is selected

Segment 3 with iMac text is selected

 

If no item is selected, this method returns the value –1