“`initWithNibName`”上的内存泄漏

Question

我有个记忆泄露的问题。在“仪器”中，我发现了这一行的内存泄漏：

VDLPlaybackViewController *videoController = [[VDLPlaybackViewController alloc] initWithNibName:@"VDLPlaybackView" bundle:nil];

我不知道这会有什么问题。以下是VDLPlaybackViewController.h的头文件

@protocol VDLPlaybackViewControllerDelegate <NSObject>
@required
-(void)playerShouldClose;
@end

@interface VDLPlaybackViewController : UIViewController <UIDocumentInteractionControllerDelegate>


@property (nonatomic, strong) id<VDLPlaybackViewControllerDelegate> delegate;

// content file stuff.
@property (nonatomic, strong) File *file;
@property (nonatomic, strong) NSNumber *contentID;
@property (nonatomic, strong) NSURL *fileURL;
@property (nonatomic, strong) NSString *pageTitle;

// layout stuff
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *topTimeViewHeight;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *bottomControlViewHeight;

@property (nonatomic, strong) IBOutlet UIView *movieView;
@property (nonatomic, strong) IBOutlet UIView *navBarView;
@property (nonatomic, strong) IBOutlet UISlider *positionSlider;
@property (nonatomic, strong) IBOutlet UIButton *timeDisplay;
@property (nonatomic, strong) IBOutlet UIButton *playPauseButton;
@property (nonatomic, strong) IBOutlet UIButton *subtitleSwitcherButton;
@property (nonatomic, strong) IBOutlet UIButton *audioSwitcherButton;
@property (nonatomic, strong) IBOutlet UIButton *screenSizeSwitcherButton;
//@property (nonatomic, strong) IBOutlet UINavigationBar *toolbar;
@property (nonatomic, strong) IBOutlet UIView *controllerPanel;
@property (nonatomic, strong) IBOutlet UISlider *volumeSlider;
@property (nonatomic, strong) IBOutlet MPVolumeView *volumeView;
@property (nonatomic, strong) IBOutlet MPVolumeView *airplayView;

@property (nonatomic, assign) CGRect shareButtonFrame;
@property (nonatomic, strong) MultiFileShareButtonController *shareButtonController;
@property (nonatomic, strong) FavoriteFileButtonView *favoriteButtonController;
@property (nonatomic, strong) UIDocumentInteractionController *interactionController;
@property (nonatomic, assign) BOOL isDestroying;

- (void)setMediaURL:(NSURL*)theURL;

- (IBAction)closePlayback:(id)sender;

- (IBAction)positionSliderDrag:(id)sender;
- (IBAction)positionSliderAction:(id)sender;
- (IBAction)toggleTimeDisplay:(id)sender;

- (IBAction)playandPause:(id)sender;
//- (IBAction)switchAudioTrack:(id)sender;
//- (IBAction)switchSubtitleTrack:(id)sender;
- (IBAction)switchVideoDimensions:(id)sender;

@end

有人知道是什么原因造成的吗？

Answer 1

插装工具告诉您，下面一行有漏洞：

VDLPlaybackViewController *videoController = [[VDLPlaybackViewController alloc] initWithNibName:@"VDLPlaybackView" bundle:nil];

这并不意味着，导致泄漏的仅仅是这一行，工具告诉您，这个变量的引用是作为泄漏存在的。

您应该查找传递了对VDLPlaybackViewController *videoController的强引用的实例。可以是委托，也可以是完成块。

你在这个问题上的界面有一个小问题。它应该是弱的而不是强的。

@property (nonatomic, weak) id<VDLPlaybackViewControllerDelegate> delegate;

找到更多这样的实例，您已经将VDLPlaybackViewController作为一个强大的引用委托传递给了它，您将能够解决这个问题。

更多地了解泄漏发生的原因。通过https://cocoacasts.com/what-are-strong-reference-cycles