Question

我为我的应用编写了一个自定义segue，它部分模糊了源视图控制器。 segue工作正常，我得到了预期的效果。当我按下按钮将segue展开回源控制器时，应用程序崩溃了。我在各种方法中放了一些日志语句但没有调用任何内容，所以我认为我已经错误地查看了这些视图。这是segue代码：

- (void)perform {
NSLog(@"performing!");
UIView *sourceView = ((UIViewController *)self.sourceViewController).view;
UIView *destView = ((UIViewController *)self.destinationViewController).view;
UIViewController *sourceController = ((UIViewController *)self.sourceViewController);

if (!_rewinding) {
[sourceView.window insertSubview:destView aboveSubview:sourceView];
    destView.center = CGPointMake(sourceView.frame.size.width * 1.5, sourceView.center.y);
}

CGPoint newSourceCenter = CGPointMake(sourceView.frame.origin.x - sourceView.frame.size.width * 0.4, sourceView.center.y);
CGPoint newDestCenter = CGPointMake(sourceView.center.x + sourceView.frame.size.width * 0.1, sourceView.center.y);


[UIView animateWithDuration:1.4
                 animations:^{
                     if (_rewinding) {
                         NSLog(@"rewind in segu");
                         destView.center = CGPointMake([UIScreen mainScreen].bounds.size.width/2, destView.center.y);
                         sourceView.center = CGPointMake([UIScreen mainScreen].bounds.size.width*1.5, sourceView.center.y);
                         destView.alpha = 1.0;
                     } else {
                         destView.center = newDestCenter;
                         sourceView.center = newSourceCenter;
                         sourceView.alpha = 0.5;
                     }
                 } completion:^(BOOL finished) {
                     if (_rewinding)
                     NSLog(@"completed animation");
                 }];
}

一些照片展示了会发生什么。在点击单元格时，详细视图从右侧屏幕向左滑动，源视图也向左滑动。

main/source view after segue

我已尝试使用[source presentViewController:dest]，但这样做会从窗口中删除源视图。由于我部分模糊了源，它必须在动画后留在屏幕上。设置它的正确方法是什么？

编辑：启用僵尸后，我在日志中得到了这个。这对应于destinationViewController。所以很明显它在segue期间没有被保留。

[58880:c07] *** -[UIStoryboardUnwindSegueTemplate performSelector:withObject:withObject:]: message sent to deallocated instance 0x1f3c7fe0

Answer 1

我将用我最终做的事来回答这个问题，但请保持开放，因为我非常感兴趣一种方法来做一个将原始视图留在屏幕上的部分。

我的快速解决方案是在原始视图控制器中处理所有动画。我认为这涵盖了上述所有与内存相关的问题，但可能不正确，因此请自担风险。

- (void)showModalDetailView {
NSLog(@"show modal");
if (!self.detailViewController) {
    self.detailViewController = (SegmentDetailViewController *)[[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:@"segDetail"];
    self.detailViewController.view.center = CGPointMake(self.view.frame.size.width * 1.5, self.view.center.y);
    [self.view.superview addSubview:self.detailViewController.view];
    self.detailViewController.delegate = self;
}

CGPoint newSourceCenter = CGPointMake(self.view.frame.origin.x - self.view.frame.size.width * 0.4, self.view.center.y);
CGPoint newDestCenter = CGPointMake(self.view.center.x + self.view.frame.size.width * 0.1, self.view.center.y);

[UIView animateWithDuration:1.4
                 animations:^{
                     if (self.shouldRewind) {
                         self.view.center = CGPointMake([UIScreen mainScreen].bounds.size.width/2, self.view.center.y);
                         self.detailViewController.view.center = CGPointMake([UIScreen mainScreen].bounds.size.width*1.5, self.detailViewController.view.center.y);
                         self.view.alpha = 1.0;
                         self.shouldRewind = NO;
                         self.detailViewController = nil;
                     } else {
                         self.detailViewController.view.center = newDestCenter;
                         self.view.center = newSourceCenter;
                         self.view.alpha = 0.5;
                         self.shouldRewind = YES;
                     }
                 } completion:^(BOOL finished) {
                     NSLog(@"animation complete");

                 }];

}

自定义Segue后退按钮崩溃应用程序

1 个答案: