iphone视图间跳转之一：自定义视图控制器

           本文将介绍两个视图之间切换，在介绍它之间，我们先理解几个概念。
我们在创建的每个View-based Application程序的都会生成一个XXXAppDelegate的头文件与源文件。
如下：

#import <UIKit/UIKit.h>@class Hello_WorldViewController;@interface Hello_WorldAppDelegate : NSObject <UIApplicationDelegate> {    UIWindow *window;    Hello_WorldViewController *viewController;}@property (nonatomic, retain) IBOutlet UIWindow *window;@property (nonatomic, retain) IBOutlet Hello_WorldViewController *viewController;@end

从上面可以看出它拥有一个UIWindow、以及XXXXViewController的成员。UIWindow可以认为它是一个iphone无任何内容的窗口，XXXXViewController是程序第一次加载到UIWindow需要显示的视图控制器，即根视图控制器，里面可以放其它视图，作为其它视图的跟视图控制器。

 

下面我们写个测试来说明这一切，先看效果图：

                                        

 

主要代码：

#import <UIKit/UIKit.h>#import "BlueViewController.h"#import "YellowViewController.h"@interface MutilViewSwitchViewController : UIViewController {YellowViewController *yellowViewController;BlueViewController *blueViewController;}@property (nonatomic, retain) YellowViewController *yellowViewController;@property (nonatomic, retain) BlueViewController *blueViewController;-(IBAction) switchViews:(id)sender;@end#import "MutilViewSwitchViewController.h"@implementation MutilViewSwitchViewController@synthesize yellowViewController;@synthesize blueViewController;-(IBAction) switchViews:(id)sender {if (self.yellowViewController.view.superview == nil) {if (self.yellowViewController.view == nil) {YellowViewController *yellowController = [[YellowViewController alloc]   initWithNibName:@"YellowViewController" bundle:nil];self.yellowViewController = yellowController;[yellowController release];}[blueViewController.view removeFromSuperview];[self.view insertSubview:yellowViewController.view atIndex:0];} else {if (self.blueViewController.view == nil) {BlueViewController *blueController = [[BlueViewController alloc]   initWithNibName:@"BlueViewController" bundle:nil];self.blueViewController = blueController;[blueController release];}[yellowViewController.view removeFromSuperview];[self.view insertSubview:blueViewController.view atIndex:0];}}/*// The designated initializer. Override to perform setup that is required before the view is loaded.- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {    if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {        // Custom initialization    }    return self;}*//*// Implement loadView to create a view hierarchy programmatically, without using a nib.- (void)loadView {}*/// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.- (void)viewDidLoad {BlueViewController *blueController = [[BlueViewController alloc]   initWithNibName:@"BlueViewController" bundle:nil];self.blueViewController = blueController;[self.view insertSubview:blueController.view atIndex:0];[blueController release];    [super viewDidLoad];}/*// Override to allow orientations other than the default portrait orientation.- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {    // Return YES for supported orientations    return (interfaceOrientation == UIInterfaceOrientationPortrait);}*/- (void)didReceiveMemoryWarning {// Releases the view if it doesn't have a superview.    [super didReceiveMemoryWarning];// Release any cached data, images, etc that aren't in use.}- (void)viewDidUnload {// Release any retained subviews of the main view.// e.g. self.myOutlet = nil;self.yellowViewController = nil;self.blueViewController = nil;}- (void)dealloc {[yellowViewController release];[blueViewController release];    [super dealloc];}@end