使用UISegmentedControl从一组或一组值中选择

Posted 2021-02-24

The UISegmentedControl consists of a horizontal control divided into segments. Segmented controls are useful for allowing users to pick from a group or set of values.

Each segment functions as its own button. By default, selecting a segment will deselect the others in the control (much as a radio button does in html). You can alter this behavior by setting the "momentary" property.

- (void)segmentClick:(id)sender
{
	NSLog(@"you selected segment %d",[sender selectedSegmentIndex]);
}
 
- (void)viewDidLoad {
 
    [super viewDidLoad];
 
	NSArray *arrSegments = [[NSArray alloc] initWithObjects:
							[NSString stringWithString:@"0"],
							[NSString stringWithString:@"1"],
							[NSString stringWithString:@"2"],nil];
 
	UISegmentedControl *mySegment = [[UISegmentedControl alloc] initWithItems:arrSegments];
 
	CGRect segmentRect = CGRectMake(10,50,300,40);
	[mySegment setFrame:segmentRect];
 
	[mySegment addTarget:self action:@selector(segmentClick:) forControlEvents:UIControlEventValueChanged];
 
	[mySegment setSegmentedControlStyle:UISegmentedControlStyleBar];
	[mySegment setTintColor:[UIColor darkGrayColor]];
	// mySegment.momentary = YES;    // allow multiple multiple selection
 
	//select first item
	[mySegment setSelectedSegmentIndex:0];
 
	//change a segment size
	[mySegment setWidth:120.0 forSegmentAtIndex:1];
 
	//add a new segment
	[mySegment insertSegmentWithTitle:@"new" atIndex:2 animated:YES];
 
	//add segment to main view
	[self.view addSubview:mySegment];	
 
}