UISegmentedControl切换view的兑现

UISegmentedControl切换view的实现

有三个view，分别为view1、view2、view3，通过UISegmentedControl进行三个view的切换。

?

@interface UIViewDemoViewController : UIViewController {IBOutlet UIView *view1;IBOutlet UIView *view2;IBOutlet UIView *view3;}- (IBAction)switchViews:(id)sender;@end

?

在Interface Builder中分别建立三个view，关联到各自的输出口，每个view上的UISegmentedControl关联到switchViews:操作。

?

- (void)viewDidLoad {    [super viewDidLoad];[self.view addSubview:view1];[self.view addSubview:view2];[self.view addSubview:view3];}- (IBAction)switchViews:(id)sender{UISegmentedControl *segmentedControl = sender;[[NSNotificationCenter defaultCenter] postNotificationName:@"switchViews" object:[NSNumber numberWithInteger:[segmentedControl selectedSegmentIndex]]];}

?

接着，为UISegmentedControl控件建立一个处理类。

?

@interface SegmentedControl : UISegmentedControl {IBOutlet UIView *view1;IBOutlet UIView *view2;IBOutlet UIView *view3;IBOutlet UIViewDemoViewController* viewController;}@end

?

将UISegmentedControl控件的Class改为刚创建的处理类：SegmentedControl，然后，将UISegmentedControl控件关联到四个输出口：view分别关联到刚创建的三个view上，viewController关联到File's Owner上。

?

- (void)awakeFromNib{[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(switchViews:) name:@"switchViews"   object:nil];}- (void)switchViews:(NSNotification*)notification{NSNumber *viewNumber = [notification object];NSInteger i = [viewNumber integerValue];[self setSelectedSegmentIndex:i];UIView *chosenView = nil;switch (i) {case 0:chosenView = view1;break;case 1:chosenView = view2;break;case 2:chosenView = view3;break;default:break;}if (chosenView) {[[viewController view] bringSubviewToFront:chosenView];}}- (void)dealloc{[super dealloc];[[NSNotificationCenter defaultCenter] removeObserver:self];}

?