ios UIPopovercontroller dealloc 在 popover 仍然可见时达到
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/8895071/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
UIPopovercontroller dealloc reached while popover is still visible
提问by Mikayil Abdullayev
I assure you that I did look for an answer in SO for my question but none of them were helpful. Here I got a simple code that should present a UIImagePickerControllerwithin a UIPopoverController:
我向您保证，我确实在 SO 中为我的问题寻找了答案，但没有一个有帮助。在这里，我得到了一个简单的代码，它应该在 aUIImagePickerController中显示一个UIPopoverController：
-(void)takePicture:(id)sender{
UIImagePickerController *picker=[[UIImagePickerController alloc] init];
picker.delegate=self;
picker.sourceType=UIImagePickerControllerSourceTypeCamera;
picker.allowsEditing=YES;
UIPopoverController *poc=[[UIPopoverController alloc]
initWithContentViewController:picker];
[poc presentPopoverFromBarButtonItem:bbItem
permittedArrowDirections:UIPopoverArrowDirectionAny
animated:NO];
}
Now, even from the first time I get [UIPopoveController dealloc]reached while... error and the program crashes. I'm not doing any retain,relase or autoreleases as per ARC. Is there any special consideration with UIPopoverControllerswhen benefitting from ARC?
现在，即使从我第一次[UIPopoveController dealloc]到达时...错误并且程序崩溃。我没有按照 ARC 进行任何保留、发布或自动发布。UIPopoverControllers从 ARC 中受益时有什么特别的考虑吗？
回答by Felix
UIPopoverControllers should always be held in an instance variable. It is a good practice to create a strong property for it.
UIPopoverControllers 应该始终保存在一个实例变量中。为它创建一个强大的属性是一个很好的做法。
UPDATE:
更新：
As of iOS 8 you should be using UIPopoverPresentationController. Then you don't need to keep a reference to the popover because it is managed by the presentation controller.
从 iOS 8 开始，您应该使用UIPopoverPresentationController. 然后你不需要保留对 popover 的引用，因为它是由演示控制器管理的。
Code example (works both on iPhone and iPad):
代码示例（适用于 iPhone 和 iPad）：
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.allowsEditing = YES;
picker.modalPresentationStyle = UIModalPresentationPopover;
UIPopoverPresentationController* popoverPC = picker.popoverPresentationController;
popoverPC.barButtonItem = bbItem;
popoverPC.permittedArrowDirections = UIPopoverArrowDirectionAny;
[self presentViewController:picker animated:YES completion:nil];
回答by tarmes
When the function exits there are no other reference to the popover controller, so it's deallocated too early.
当函数退出时，没有其他对 popover 控制器的引用，所以它过早地被释放。
Try adding it as a member of your class instead.
尝试将其添加为班级成员。
Tim
蒂姆
回答by orafaelreis
Adding what @phix23 answered, create *poc property like this:
添加@phix23 回答的内容，创建 *poc 属性，如下所示：
@property (nonatomic, retain) IBOutlet UIPopoverController *poc;
and then change
然后改变
UIPopoverController *poc = [[UIPopoverController alloc]
initWithContentViewController:picker];
for
为了
self.poc = [[UIPopoverController alloc]
initWithContentViewController:picker];
