iPhone内存管理问题

发布于 2024-08-18 23:27:34 字数 969 浏览 9 评论 0原文

我分离了一个调用我的方法的线程，该方法有一个 while 循环。即使我将它们标记为 autoreleasepool，我也会手动释放对象，因为 while 循环可以继续一段时间。

问题是，一段时间后，应用程序因内存问题而崩溃。如果我查看 Instruments，我可以看到分配了一大堆 NSString，并且在图中创建了通往天堂的阶梯。我未能释放什么？

while (keepGettingScores)  
{  
    NSString *jsonString = [[NSString alloc] initWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];  
    NSDictionary *json = [jsonString JSONValue];  
    [jsonString release];   

    NSMutableArray *scores = [[NSMutableArray alloc] init];  
    [scores setArray:(NSMutableArray*)[[jsonString JSONValue] objectForKey:@"scores"]];

    NSSortDescriptor *sorter = [[NSSortDescriptor alloc] initWithKey:@"totalScore" ascending:NO];  
    [scores sortUsingDescriptors:[NSArray arrayWithObject:sorter]];  
    [sorter release];  

    [self performSelectorOnMainThread:@selector(updatePlayerTable:) withObject:scores waitUntilDone:NO];  
    [scores release];  

    [NSThread sleepForTimeInterval:1.0];  
}

原文

I detach a thread calling my method which has a while-loop. Even though I have them marked as autoreleasepool, I release the objects manually, since the while-loop can continue on for a some time.

The problem is that after a while, the app crashes due to memory problems. If I look in Instruments, I can see a huge pile of NSStrings allocated and a stairway to heaven is created in the graph. What have I failed to release?

while (keepGettingScores)  
{  
    NSString *jsonString = [[NSString alloc] initWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];  
    NSDictionary *json = [jsonString JSONValue];  
    [jsonString release];   

    NSMutableArray *scores = [[NSMutableArray alloc] init];  
    [scores setArray:(NSMutableArray*)[[jsonString JSONValue] objectForKey:@"scores"]];

    NSSortDescriptor *sorter = [[NSSortDescriptor alloc] initWithKey:@"totalScore" ascending:NO];  
    [scores sortUsingDescriptors:[NSArray arrayWithObject:sorter]];  
    [sorter release];  

    [self performSelectorOnMainThread:@selector(updatePlayerTable:) withObject:scores waitUntilDone:NO];  
    [scores release];  

    [NSThread sleepForTimeInterval:1.0];  
}

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死开点丶别碍眼 2024-08-25 23:27:34

我没有看到任何明显的问题，您的 JSON 库中是否存在问题？

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伤痕我心 2024-08-25 23:27:34

线程执行完毕后，您是否会耗尽池中的资源？

您需要创建一个 NSAutoreleasePool 并在线程执行完毕后调用其排出方法。

在我的一个项目中，我有一个线程需要创建大量自动释放对象，并发现在线程运行时定期耗尽池很有用。

- (void)doStuff:(NSObject *)parent {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];      

    /* Do lots of stuff *.
    /* Periodically, I'd drain and recreate the pool */
    [pool drain];
    pool = [[NSAutoreleasePool alloc] init];
    /* The rest of my stuff */

    [pool drain];
}

并使用 detachNewThreadSelector 调用 doStuff:：

Are you draining your pool after your thread is finished executing?

You need to create an NSAutoreleasePool and call its drain method when your thread is finished executing.

In one of my projects, I had a thread that needed to create a lot of autorelease objects and found it useful to periodically drain the pool as the thread was running.

- (void)doStuff:(NSObject *)parent {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];      

    /* Do lots of stuff *.
    /* Periodically, I'd drain and recreate the pool */
    [pool drain];
    pool = [[NSAutoreleasePool alloc] init];
    /* The rest of my stuff */

    [pool drain];
}

And doStuff: is called using detachNewThreadSelector:

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