iphone - 当 iPad 方向改变时，UIView 动画行为异常

Question

我正在使用这段代码来实现 UIView 过渡效果

[UIView beginAnimations: nil context: nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
[UIView commitAnimations];

现在的问题是，当我向左横向旋转 ipad 时，它的行为很奇怪，如果我给出条件是否向左横向而不是 UIViewAnimationTransitionCurlDown，动画仍然与向右横向旋转时的动画不一样

Answer 1

我遇到了完全相同的问题。 对于难以理解问题的人:

当你在横向模式下“卷起”时，点击右边的按钮，页面开始从右上翻到左下(意思是，你用右手翻页，然后向书的左边。也意味着书的装订在左边)。

当你做同样的事情，但按钮在左边时，动画不会旋转，即使正确旋转内容，在 vc 中说“shouldAutorotateToInterfaceOrientation : True”。结果，动画从左下角移动到右上角，给人的印象是书的装订现在在右边。

一些代码来说明:

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self)
    {
        view1 = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
        [view1 setBackgroundColor:[UIColor greenColor]];
        [view1 setFont:[UIFont systemFontOfSize:80]];
        [view1 setText:@"VIEW 1"];

        view2 = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
        [view2 setBackgroundColor:[UIColor redColor]];
        [view2 setFont:[UIFont systemFontOfSize:80]];
        [view2 setText:@"VIEW 2"];
    }
    return self;
}


-(void)didSwipeNext
{
    [self performSelector:@selector(swipePrevious) withObject:nil afterDelay:1];
}

-(void)didSwipePrevious
{
    [self performSelector:@selector(swipeNext) withObject:nil afterDelay:1];
}

-(void)swipeNext
{
    [UIView beginAnimations:@"curl" context:NULL];
    [UIView setAnimationDuration:1];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationBeginsFromCurrentState:NO];
    [UIView setAnimationDidStopSelector:@selector(didSwipeNext)];

    [view1 removeFromSuperview];
    [self.view addSubview:view2];

    [UIView commitAnimations];
}

-(void)swipePrevious
{

    [UIView beginAnimations:@"curl" context:NULL];
    [UIView setAnimationDuration:1];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view cache:YES];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationBeginsFromCurrentState:NO];
    [UIView setAnimationDidStopSelector:@selector(didSwipePrevious)];

    [view2 removeFromSuperview];
    [self.view addSubview:view1];

    [UIView commitAnimations];
}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view addSubview:view1];
    [self performSelector:@selector(swipeNext) withObject:nil afterDelay:1];
}


// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}