IOS 7 Study - UISegmentedControl

矫情吗；* 2021-12-24 13:07 254阅读 0赞

**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:

![101909183046163.png][]

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

转载于:https://www.cnblogs.com/davidgu/p/3543411.html

[101909183046163.png]: /images/20211223/7bf1b7f538e6488cbc8bb668f8fa9bba.png