此处的代码是从 RootViewController 启动的模态视图，用于显示带有缩略图幻灯片的视频，然后将定时指令绑定到该电影。
一切正常，但是有一个内存泄漏/缺乏释放，我只是看不到寻找并花了三天时间试图修复它，是时候寻求帮助了......
如果我通过注释掉 NSNotificationCenter 来禁用它（在 .m 中突出显示）我没有任何关于内存的问题并保留定时文本。但我也没有任何缩略图。我已经尝试 [[NSNotificationCenter alloc] removeObserver:self];在很多地方插入，看看是否会为我摆脱它。但很可惜，无济于事。
我也尝试过发布“backgroundTimer”，但当我尝试编译和运行时并没有给它留下太大的印象。
从本质上讲，我第一次加载模式视图时，没有任何问题，一切看起来都很好 - 但是，如果我用-(IBAction)close:(id)sender;它关闭它，似乎有些东西没有释放，因为下次我启动同一页面时，内存使用量会增加大约 30%（大约是缩略图生成所使用的数量），并且每次我重新启动模态视图时都会增加大致相同的数量。
请记住，我是这方面的新手，对于那些知道的人来说，这个错误可能是一个愚蠢的错误。但是为了完成这个项目，我很乐意接受你对我的任何辱骂。
这是代码：
。H
#import <UIKit/UIKit.h>
#import <MediaPlayer/MPMoviePlayerController.h>
#import "ImageViewWithTime.h"
#import "CommentView.h"
@interface SirloinVideoViewController_iPad : UIViewController {
UIView *landscapeView;
UIView *viewForMovie;
MPMoviePlayerController *player;
UILabel *onScreenDisplayLabel;
UIScrollView *myScrollView;
NSMutableArray *keyframeTimes;
NSArray *shoutOutTexts;
NSArray *shoutOutTimes;
NSTimer *backgroundTimer;
UIView *instructions;
}
-(IBAction)close:(id)sender;
-(IBAction)textInstructions:(id)sender;
@property (nonatomic, retain) IBOutlet UIView *instructions;
@property (nonatomic, retain) NSTimer *theTimer;
@property (nonatomic, retain) NSTimer *backgroundTimer;
@property (nonatomic, retain) IBOutlet UIView *viewForMovie;
@property (nonatomic, retain) MPMoviePlayerController *player;
@property (nonatomic, retain) IBOutlet UILabel *onScreenDisplayLabel;
@property (nonatomic, retain) IBOutlet UIScrollView *myScrollView;
@property (nonatomic, retain) NSMutableArray *keyframeTimes;
-(NSURL *)movieURL;
- (void) playerThumbnailImageRequestDidFinish:(NSNotification*)notification;
- (ImageViewWithTime *)makeThumbnailImageViewFromImage:(UIImage *)image andTimeCode:(NSNumber *)timecode;
- (void)handleTapFrom:(UITapGestureRecognizer *)recognizer;
@end
.m
#import "SirloinVideoViewController_iPad.h"
#import "SirloinTextViewController.h"
@implementation SirloinVideoViewController_iPad
@synthesize theTimer, backgroundTimer, viewForMovie, player,
onScreenDisplayLabel, myScrollView, keyframeTimes, instructions;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
}
return self;
[nibNameOrNil release];
[nibBundleOrNil release];
}
- (IBAction)close:(id)sender{
[self.parentViewController dismissModalViewControllerAnimated:YES];
[player stop];
[player release];
[theTimer invalidate];
[theTimer release];
[backgroundTimer invalidate];
[SirloinVideoViewController_iPad release];
}
——</p>
-(IBAction)textInstructions:(id)sender {
SirloinTextViewController *vController = [[SirloinTextViewController alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:vController animated:YES];
[vController release];
}
- (void)viewDidLoad {
[super viewDidLoad];
keyframeTimes = [[NSMutableArray alloc] init];
shoutOutTexts = [[NSArray
arrayWithObjects:
@"1. XXXXXXXXXXXX",
@"2. XXXXXXXXXXXX",
@"3. XXXXXXXXXXXX",
@"4. XXXXXXXXXXXX",
@"5. XXXXXXXXXXXX",
@"6. XXXXXXXXXXXX"
@"7. XXXXXXXXXXXX",
@"8. XXXXXXXXXXXX",
@"9. XXXXXXXXXXXX",
@"10. XXXXXXXXXXXX",
@"11. XXXXXXXXXXXX",
@"12. XXXXXXXXXXXX",
@"13. XXXXXXXXXXXX",
@"14. XXXXXXXXXXXX",
@"15. XXXXXXXXXXXX",
nil] retain];
shoutOutTimes = [[NSArray
arrayWithObjects:
[[NSNumber alloc] initWithInt: 1],
[[NSNumber alloc] initWithInt: 73],
[[NSNumber alloc] initWithInt: 109],
[[NSNumber alloc] initWithInt: 131],
[[NSNumber alloc] initWithInt: 205],
[[NSNumber alloc] initWithInt: 250],
[[NSNumber alloc] initWithInt: 337],
[[NSNumber alloc] initWithInt: 378],
[[NSNumber alloc] initWithInt: 402],
[[NSNumber alloc] initWithInt: 420],
[[NSNumber alloc] initWithInt: 448],
[[NSNumber alloc] initWithInt: 507],
[[NSNumber alloc] initWithInt: 531],
[[NSNumber alloc] initWithInt: 574],
nil] retain];
self.player = [[MPMoviePlayerController alloc] init];
self.player.contentURL = [self movieURL];
self.player.view.frame = self.viewForMovie.bounds;
self.player.view.autoresizingMask =
UIViewAutoresizingFlexibleWidth |
UIViewAutoresizingFlexibleHeight;
[self.viewForMovie addSubview:player.view];
backgroundTimer = [NSTimer scheduledTimerWithTimeInterval:0.5f target:self selector:@selector(timerAction:) userInfo:nil repeats:YES];
[self.view addSubview:self.myScrollView];
//I am pretty sure that this is the culprit - Just not sure why...
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(movieDurationAvailable:)
name:MPMovieDurationAvailableNotification
object:theTimer];
//Could be wrong, but when commented out I don't have the memory issues
}
——</p>
- (NSInteger)positionFromPlaybackTime:(NSTimeInterval)playbackTime
{
NSInteger position = 0;
for (NSNumber *startsAt in shoutOutTimes)
{
if (playbackTime > [startsAt floatValue])
{
++position;
}
}
return position;
}
-(NSURL *)movieURL
{
NSBundle *bundle = [NSBundle mainBundle];
NSString *moviePath =
[bundle
pathForResource:@"sirloin"
ofType:@"m4v"];
if (moviePath) {
return [NSURL fileURLWithPath:moviePath];
} else {
return nil;
}
}
NSTimeInterval lastCheckAt = 0.0;
- (void)timerAction: theTimer
{
int count = [shoutOutTimes count];
NSInteger position = [self positionFromPlaybackTime:self.player.currentPlaybackTime];
NSLog(@"position is at %d", position);
if (position > 0)
{
--position;
}
if (position < count)
{
NSNumber *timeObj = [shoutOutTimes objectAtIndex:position];
int time = [timeObj intValue];
NSLog(@"shout scheduled for %d", time);
NSLog(@"last check was at %g", lastCheckAt);
NSLog(@"current playback time is %g", self.player.currentPlaybackTime);
if (lastCheckAt < time && self.player.currentPlaybackTime >= time)
{
NSString *shoutString = [shoutOutTexts objectAtIndex:position];
NSLog(@"shouting: %@", shoutString);
CommentView *cview = [[CommentView alloc] initWithText:shoutString];
[self.instructions addSubview:cview];
[shoutString release];
}
}
lastCheckAt = self.player.currentPlaybackTime;
}
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
-(void)removeObserver:(NSObject *)observer forKeyPath:(NSString *)keyPath {
[[NSNotificationCenter defaultCenter] removeObserver:MPMovieDurationAvailableNotification];
[[NSNotificationCenter defaultCenter] removeObserver:MPMoviePlayerThumbnailImageRequestDidFinishNotification];
[keyPath release];
}
- (void) movieDurationAvailable:(NSNotification*)notification {
float duration = [self.player duration];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(playerThumbnailImageRequestDidFinish:)
name:MPMoviePlayerThumbnailImageRequestDidFinishNotification
object:nil];
NSMutableArray *times = [[NSMutableArray alloc] init];
for(int i = 0; i < 20; i++) {
float playbackTime = i * duration/20;
[times addObject:[NSNumber numberWithInt:playbackTime]];
}
[self.player
requestThumbnailImagesAtTimes:times
timeOption: MPMovieTimeOptionExact];
}
- (void) playerThumbnailImageRequestDidFinish:(NSNotification*)notification {
NSDictionary *userInfo = [notification userInfo];
NSNumber *timecode =
[userInfo objectForKey: MPMoviePlayerThumbnailTimeKey];
UIImage *image =
[userInfo objectForKey: MPMoviePlayerThumbnailImageKey];
ImageViewWithTime *imageView =
[self makeThumbnailImageViewFromImage:image andTimeCode:timecode];
[myScrollView addSubview:imageView];
UITapGestureRecognizer *tapRecognizer =
[[UITapGestureRecognizer alloc]
initWithTarget:self action:@selector(handleTapFrom:)];
[tapRecognizer setNumberOfTapsRequired:1];
[imageView addGestureRecognizer:tapRecognizer];
[tapRecognizer release];
[image release];
[imageView release];
}
- (void)handleTapFrom:(UITapGestureRecognizer *)recognizer {
ImageViewWithTime *imageView = (ImageViewWithTime *) recognizer.view;
self.player.currentPlaybackTime = [imageView.time floatValue];
}
- (ImageViewWithTime *)makeThumbnailImageViewFromImage:(UIImage *)image andTimeCode:(NSNumber *)timecode {
float timeslice = self.player.duration / 3.0;
int pos = [timecode intValue] / (int)timeslice;
float width = 75 *
((float)image.size.width / (float)image.size.height);
self.myScrollView.contentSize =
CGSizeMake((width + 2) * 13, 75);
ImageViewWithTime *imageView =
[[ImageViewWithTime alloc] initWithImage:image];
[imageView setUserInteractionEnabled:YES];
[imageView setFrame:CGRectMake(pos * width + 2, 0, width, 75.0f)];
imageView.time = [[NSNumber alloc] initWithFloat:(pos * timeslice)];
return imageView;
[myScrollView release];
}
- (void)dealloc {
[player release];
[viewForMovie release];
[onScreenDisplayLabel release];
[keyframeTimes release];
[instructions release];
[shoutOutTexts release];
[shoutOutTimes release];
[super dealloc];
}
@end
这个应用程序已经大量使用 UIWebView （只是简单的 sux），所以我正在努力做正确的事情并正确地做。