AppDelegate 、UIApplication 简单的用法

//AppDelegate.h 头文件

#import <UIKit/UIKit.h>

@class SwitchViewController;

@interface AppDelegate : UIResponder <UIApplicationDelegate>

{

UIApplication *mApp;
//新建一个UIApplication对象

}

@property (strong, nonatomic) UIWindow *window;

@property (nonatomic, retain) SwitchViewController *switchViewController; //为窗口转换的类

@end

#import "AppDelegate.h"

#import "SwitchViewController.h"

@implementation AppDelegate

@synthesize window = _window;

@synthesize switchViewController;

- (void)dealloc

{

[_window release];

[switchViewController release];

mApp.idleTimerDisabled = NO;

[super dealloc];

}

- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

self.window = [[[UIWindow
alloc] initWithFrame:[[UIScreen
mainScreen] bounds]] autorelease];

//初始化

switchViewController = [[SwitchViewController alloc]init];

//这两句话效果一样

//[[self window]setRootViewController:switchViewController];

self.window.rootViewController = self.switchViewController;

[switchViewController release];

mApp = application;

application.idleTimerDisabled = YES;

[[self window]makeKeyAndVisible];
//或[self.window makeKeyAndVisible];

return YES;

}

@end

//SwitchViewController 类头文件。集中实现窗口跳转

#import <UIKit/UIKit.h>

#import "ViewTestone.h"

#import "ViewController.h"

@class ViewTestone;
//View

@class ViewController;
//View

typedef int RequestId;

enum REQUESTVIEW

{

REQUEST_TESTONEVIEW,

};

@interface SwitchViewController :UIViewController

{

}

@property (nonatomic, retain)ViewTestone *viewTestone;

@property (nonatomic, retain) UIViewController *previousViewController;

@property (nonatomic, retain)ViewController *viewController;

-(void)switchToView:(RequestId)requestId;

-(void)gotoTestoneView;
//跳转到TestoneView

@end

//SwitchViewController.m 文件

#import "SwitchViewController.h"

@implementation SwitchViewController

{

}

@synthesize viewTestone;

@synthesize previousViewController;

@synthesize viewController;

//当程序加载完AppDelegate里的 didFinishLaunchingWithOptions 方法后就会跳到这里 .下面可把ViewController实现为默认的View加载

-(void)viewDidLoad

{

NSLog(@"----------");

if(self.viewController ==nil)

{

//新建VIEWCONTRollerr 的一个对象

ViewController *viewcontroll = [[ViewController
alloc]initWithNibName:@"ViewConTroller" bundle:nil];

self.viewController = viewcontroll;

[viewcontroll release];

}

[self.view insertSubview:viewController.view
atIndex:0];

self.previousViewController = self.viewController;

}

-(void)viewDidUnload

{

self.viewController = nil;

self.viewTestone = nil;

[super viewDidLoad];

}

-(void)dealloc

{

[viewTestone release];

[viewController release];

[super dealloc];

}

//下面具体实现view之间的跳转。一般的程序都会有很多个这样的窗口跳转。所以把它们集中在一个公共的类里面这样会拿的代码看上去很简洁。明了，

-(void)switchToView:(RequestId)requestId

{

switch (requestId) {

case REQUEST_TESTONEVIEW:

[self gotoTestoneView];

break;

//....................

default:

break;

}

}

//这就到了具体到某一个窗口之间的跳转了。

-(void)gotoTestoneView

{

NSLog(@"test ok~");

if(self.viewTestone ==nil)

{

ViewTestone *testOneView = [[ViewTestone
alloc]initWithNibName:@"ViewTestone" bundle:nil];

self.viewTestone = testOneView;

[testOneView release];

}

if(self.previousViewController.view.superview !=nil)

{

[previousViewController.view removeFromSuperview];

}

[self.view insertSubview:viewTestone.view
atIndex:0];

self.previousViewController = [self viewTestone];

}

@end

//具体的实现方法。。应用～

-(void)addButtonToNewView

{

//新建一个按键

UIButton *toviewBtn = [UIButton buttonWithType:UIButtonTypeCustom];

//设置按钮的背景颜色 UIControlStateNormal按钮按之前的颜色 UIControlStateHighlighted反之

[toviewBtn setImage:[UIImage imageNamed:@"v_exit.png"]forState:UIControlStateNormal ] ;

//CGRect r;

//r = CGRectMake(120, 300, 100, 30);

//设置按钮的大小

toviewBtn.frame = CGRectMake(120, 300, 100, 30);;

//为按钮添加事件

[toviewBtn addTarget:self action:@selector(toOntViewPress:) forControlEvents:UIControlEventTouchUpInside];

//加载到当前的view

[self.view addSubview:toviewBtn];

}

-(void)toOntViewPress:(id)sender

{

NSLog(@"successfull");

//前面长长的AppDelegate SwitchViewController 都是为了下面这两句话。两句话就可以轻松的跳转到你想要去的页面。这样就显得很方便。

AppDelegate *app = [[UIApplication
sharedApplication]delegate];

[app.switchViewController switchToView:0];

}