Question

我使用的是ios 7，我需要这样做：

在separete线程中，我想从网络创建图像并将其放入UIImageView。我需要每200毫秒做一次。

我的代码如下：

- (void)startPreview:(CGFloat)specialFramesRates;
{
    if(isPreview)
        return;

    [Utils runOnThread:^{
        [Log log:@"Start preview"];   //here we have a leak

        isPreview = YES;
        while(isPreview) {
            [self getNewBitmap];

            sleep(fpsTime);

            if(!isPreview)
                break;

            if(checkAvabilityCam > 10)
                break;
        }

        [Log log:@"Stoped preview"];
    }];
}

- (void)getNewBitmap
{   
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
    [request setTimeoutInterval:1];
    [request setHTTPMethod:@"GET"];

    NSError *requestError;
    NSURLResponse *urlResponse = nil;


    NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&requestError];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    if(delegate && response) {
        checkAvabilityCam = 0;

        //TODO what I should do here?
        UIImage *image = [UIImage imageWithData:newImage];  //HERE IS LEAK !!!!

        [delegate onShowImage:response];  //here I show image in main thread
        image = nil;   //With or without doesn't work
        return;
    }

    checkAvabilityCam++;
    if(delegate)
        [delegate onShowDefaultImage];
}

在这行代码中我遇到了一个问题：

//TODO what I should do here?
UIImage *image = [UIImage imageWithData:newImage];  //HERE IS LEAK !!!!

[delegate onShowImage:response];  //here I show image in main thread
image = nil;   //With or without doesn't work

我可以使用什么代替＆＃34; [UIImage imageWithData：]＆＃34; ？我尝试保存到文件和加载但具有相同的效果。我该怎么办？

Answer 1

UIImage *image = [UIImage imageWithData:newImage];  //HERE IS LEAK !!!!

您正在此处创建自动释放的对象。由于您是在后台线程上执行此操作，因此除非您的线程具有自己的自动释放池，否则您创建的任何自动释放的对象都不会被释放。

如果您使用ARC，请使用@autoreleasepool关键字创建自动释放池：

@autoreleasepool {
    UIImage *image = [UIImage imageWithData:newImage];

    // Do stuff with image
}

如果您不使用ARC，请手动创建自动释放池：

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
UIImage *image = [UIImage imageWithData:newImage];

// Do stuff with image

[pool release];

UIImage中的iOS内存泄漏

1 个答案: