找了好久，IOS实现半翻页功能

- (void)applicationDidFinishLaunching:(UIApplication *)application {    

    // Override point for customization after application launch
PageViewController *pvController = [[PageViewController alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:pvController];  //加载有标题的view
    navController.navigationBar.tintColor=[UIColor redColor]; //颜色设置
[window addSubview:navController.view];
    [window makeKeyAndVisible];

}

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- (id)init
{
if (!(self = [super init])) 
return self;
self.title = @"翻页 Demo";
return self;
}

// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
UIView *contentView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
self.view = contentView;  //没有xib的时候需要
    
  UIView *frontView1 = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 416.0f)];
    //frontView1.backgroundColor = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"back1.png"]];  
    frontView1 = [[[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    frontView1.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"back1.jpg"]];  
    [self.view addSubview:frontView1];
    
    UIView *frontView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 416.0f)];
    frontView.backgroundColor = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"back2.jpg"]];
    [self.view addSubview:frontView]; 

   switchView = [[[UISwitch alloc] init] autorelease];
  [switchView setCenter:CGPointMake(200.0f,350.0f)];
  [frontView1 addSubview:switchView];
    
switchStatusLabel = [[[UILabel alloc] initWithFrame:CGRectMake(250.0f, 250.0f, 50.0f, 30.0f)] autorelease];
[frontView addSubview:switchStatusLabel];
[switchStatusLabel setTextAlignment:UITextAlignmentCenter];
switchStatusLabel.text=@"OFF";

isCurl=NO;
self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc]   //按钮的初始化及触发条件设置
   initWithTitle:@"Curl" 
   style:UIBarButtonItemStylePlain 
   target:self 
                                            action:@selector(doCurl)] autorelease];
}

- (void) doCurl
{
//创建CATransition对象
CATransition *animation = [CATransition animation];
//相关参数设置
[animation setDelegate:self];
[animation setSpeed:3.0f];
[animation setDuration:1.0f];
[animation setTimingFunction:UIViewAnimationCurveEaseInOut];
//向上卷的参数
if(!isCurl)
{
//设置动画类型为pageCurl，并只卷一半
[animation setType:@"pageCurl"];   
animation.endProgress=0.7;
}
//向下卷的参数
else
{
//设置动画类型为pageUnCurl，并从一半开始向下卷
[animation setType:@"pageUnCurl"];
animation.startProgress=0.7;
}
//卷的过程完成后停止，并且不从层中移除动画
[animation setFillMode:kCAFillModeForwards];
[animation setSubtype:kCATransitionFromBottom];
[animation setRemovedOnCompletion:NO];

isCurl=!isCurl;

[self.view exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
[[self.view layer] addAnimation:animation forKey:@"pageCurlAnimation"];  //翻页效果
if([switchView isOn])
{
switchStatusLabel.text=@"ON";
}
else
{
switchStatusLabel.text=@"OFF";
}

}