iphone - 左右滑动 UIView

Question

我正在尝试为 UIView 设置动画以左右滑动。我尝试的是截取当前 View 的屏幕截图，而不是在更新屏幕外 View 的内容时用屏幕截图替换 View ，然后制作动画。但是屏幕截图没有显示在屏幕上。它只是黑色，直到原始 View 滑回屏幕上。这是我正在使用的代码:

    UIGraphicsBeginImageContext(self.view.window.frame.size);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    UIImageView *iv = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.frame.size.width, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height)];
    iv.image = image;
    [self.view.window insertSubview:iv aboveSubview:self.view];
    self.view.frame = CGRectMake(-self.view.frame.size.width, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);
    [UIView transitionWithView:self.view duration:0.5 options:UIViewAnimationOptionCurveEaseInOut animations:^{
        iv.frame = CGRectMake(self.view.frame.size.width*2, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);
        [self loadData];
        self.view.frame = CGRectMake(0, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);
    } completion:NULL];
    [iv removeFromSuperview];
    [iv release];

Answer 1

我发现了问题。我只需要在完成 block 中执行 [iv removeFromSuperview]; 。现在可以使用了。