翻书效果的实现

效果图：

代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    //初始化背景图
    [self initBackgroundView];
}
#pragma -mark -functions
-(void)initBackgroundView
{
    self.title=@"翻书效果的实现";
    self.view.backgroundColor=[UIColor redColor];

    //upButton
    UIButton *upButton = [UIButton buttonWithType:UIButtonTypeCustom];
    upButton.frame = CGRectMake(20, 420, 50, 26);
    upButton.backgroundColor=[UIColor blueColor];
    [upButton setTitle:@"up" forState:UIControlStateNormal];
    [upButton addTarget:self action:@selector(doClickUpButton) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:upButton];

    //downButton
    UIButton *downButton = [UIButton buttonWithType:UIButtonTypeCustom];
    downButton.frame = CGRectMake(250, 420, 50, 26);
    downButton.backgroundColor=[UIColor blueColor];
    [downButton setTitle:@"down" forState:UIControlStateNormal];
    [downButton addTarget:self action:@selector(doClickDownButton) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:downButton];

}
#pragma -mark -doClickAction
-(void)doClickUpButton
{
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.7];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view cache:YES];
    [UIView commitAnimations];
}
-(void)doClickDownButton
{
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.7];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
    [UIView commitAnimations];
}