Ui: uisegmentedcontrol: simple option grouping and customization

Problem:

You can select one of the simple and easy-to-understand options.

 

Create a uisegmentedcontrol instance to initialize a control:

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    self.view.backgroundColor = [UIColor whiteColor];    NSArray *segments = [[NSArray alloc]initWithObjects:                         @"iPhone",                         @"iPad",                         @"iPod",                         @"iMac", nil];     _mySegmentControl = [[UISegmentedControl alloc]initWithItems:segments];    _mySegmentControl.center = self.view.center;        [self.view addSubview:_mySegmentControl];}

Now, how do we know that the user has selected an option? The answer is simple. Just like uiswitch and uislider, use addtarget: Action: forcontrolevents: to add a target. you need to pass the uicontroleventvaluechanged value to the forcontrolevents parameter because this parameter triggers the event when you select an option in the control.

[_mySegmentControl addTarget:self action:@selector(segmentChanged:) forControlEvents:UIControlEventValueChanged];

//segment选项变化时调用方法- (void)segmentChanged:(UISegmentedControl *)paramSender{    if ([paramSender isEqual:_mySegmentControl]) {        NSInteger selectedSegmentIndex = [paramSender selectedSegmentIndex];        NSString *selectedSegmentText = [paramSender titleForSegmentAtIndex:selectedSegmentIndex];        NSLog(@"Segment %ld with %@ text is selected", (long)selectedSegmentIndex,selectedSegmentText);    }}

If you want to change this option back to the original state (as if it was not selected) after you select an option, set the momentary attribute to yes.

_mySegmentControl.momentary = YES;

A very flexible feature of the segment control is that it can display images. To display an image, use initwithobjects: the initialization method transmits the image, character, and image as parameters at the same time.

NSArray *segments = [[NSArray alloc] initWithObjects: @"iPhone",[UIImage imageNamed:@"iPad.png"],@"iPod",@"iMac", nil];self.mySegmentedControl = [[UISegmentedControl alloc] initWithItems:segments];

 

 

Ui: uisegmentedcontrol: simple option grouping and customization