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];
}

 

代码可以到视图切换的动画效果进行下载。