打开UIPickerController并关闭它时内存泄漏

Question

这可能听起来像一个新手问题，但我是iOS开发新手。

我已经关注了代码。

- (void) onUploadButtonClick
{
    UIImagePickerController* imgPicker = [[UIImagePickerController alloc] init];
    [[[UIApplication sharedApplication] keyWindow] setRootViewController:imgPicker];
    imgPicker.delegate = self;
    imgPicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    imgPicker.allowsEditing = NO;
    [self presentModalViewController:imgPicker animated:YES];
    [imgPicker release];
}

我正在运行应用程序并对内存泄漏进行分析，所以只需单击按钮并关闭它，而不做任何事情我会得到内存泄漏。我在模拟器上运行它。

为什么会这样？

更新：来自探查器控制台的泄漏信息 泄露的对象，＃地址大小负责的图书馆负责框架

Malloc 32.50 KB,3   < multiple >    99840   MusicLibrary    MemNewPtrClear
 Malloc 32.50 KB,   0xa083800   33280   MusicLibrary    MemNewPtrClear
 Malloc 32.50 KB,   0x7840a00   33280   MusicLibrary    MemNewPtrClear
 Malloc 32.50 KB,   0x7806a00   33280   MusicLibrary    MemNewPtrClear


Leaked Object,# Address Size    Responsible Library Responsible Frame
Malloc 32.50 KB,    0xa083800   33280   MusicLibrary    MemNewPtrClear


Leaked Object,# Address Size    Responsible Library Responsible Frame
Malloc 32.50 KB,    0x7840a00   33280   MusicLibrary    MemNewPtrClear


Leaked Object,# Address Size    Responsible Library Responsible Frame
Malloc 32.50 KB,    0x7806a00   33280   MusicLibrary    MemNewPtrClear


Leaked Object,# Address Size    Responsible Library Responsible Frame
Malloc 128.00 KB,   0x128de000  131072  MusicLibrary    ReadITImageDB

Answer 1

为什么你会用UIImagePickerController做类似的事情？你实际上是在杀死你的实际rootViewController。

 [[[UIApplication sharedApplication] keyWindow] setRootViewController:imgPicker];

只需删除此行，一切都会正常。

Answer 2

您应该使用UINavigationController并将UIImagePickerController推到其上，或以模拟方式显示UIImagePickerController。通过将UIImagePickerController设置为您的根控制器，您将丢失之前的rootViewController，并且无法返回它。内存泄漏可能是因为根UIViewController错误地实现了viewDidUnload和dealloc方法。