交叉溶解过渡干扰 UIPageController 页面上的页面卷曲

Question

我在我的 UIPageController subclass 页面上的图像之间交叉溶解。在应用过渡时可以翻页。有时，正在翻页的页面会在翻页中变为透明，直到转换完成。

在下面的代码中，Page class 是 UIViewController 的子class，它的视图有一个 UIImageView 子视图。 PageController 是我的 UIPageViewController subclass。

@implementation PageController : UIPageViewController 

- (void)crossfadeToImage:(UIImage *)image
{   
    for (int i = 0; i < self.pages.count; i++) {
        Page *page = self.pages[i];  // Pages fed to page controller in delegate
        [UIView transitionWithView:page.view duration:duration options:UIViewAnimationOptionTransitionCrossDissolve | UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionCurveEaseInOut animations:^{
            page.image = image;
        } completion:nil];
    }

}

页面代码如下：

// HEADER

@interface Page : UIViewController

@property (strong, nonatomic) UIImage *image;

- (instancetype)initWithPageFrameSize:(CGSize)size image:(UIImage *)image;

@end

// IMPLEMENTATION

@implementation Page

- (void)loadView
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, _pageFrameSize.width, _pageFrameSize.height)];

    self.view = view;
}

- (UIImage *)image
{
    return _imageView.image;
}

- (void)setImage:(UIImage *)image
{
    if (!_imageView) {
        _imageView = [[UIImageView alloc] initWithImage:image];
        _imageView.frame = self.view.bounds;
        [self.view addSubview:_imageView];
    } else {
        _imageView.image = image;
    }
}

@end

我猜交叉淡入淡出和卷页动画以某种奇怪的方式堆叠。关于如何防止这种 "disappearing page" 副作用的任何想法？

Answer 1

原来将动画应用到 imageView 直接解决了这个问题。类似于：

- (void)crossfadeToImage:(UIImage *)image
{
    for (int i = 0; i < self.pages.count; i++) {
        Page *page = self.pages[i];  // Pages fed to page controller in delegate
        [UIView transitionWithView:page.**imageView** duration:duration options:UIViewAnimationOptionTransitionCrossDissolve | UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionCurveEaseInOut animations:^{
            page.**imageView**.image = image;
        } completion:nil];
    }
}

不过，欢迎任何关于为什么它不能以其他方式工作的见解。

交叉溶解过渡干扰 UIPageController 页面上的页面卷曲

Cross-dissolve transitions interfering with page curls on UIPageController pages

objective-c

uiviewanimation

ios

uipageviewcontroller

uikit-transitions