在 iPhone 中使用 UIImagePickerControllerSourceTypeCamera 捕获图像 10 或 11 次后收到内存警告

Question

您好，每当我使用相机时，我都会收到内存警告。

错误是这样的：

"Receive memory warning..."

代码是：

-(void) getPhoto{

    GameAppdelegate *appDelegate = (GameAppdelegate *)[[UIApplication sharedApplication]delegate];

    UIImagePickerController * picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;

    ///////////////////////////////////photolibrary//////////////////////////////
    if([appDelegate.photoselection isEqualToString:@"User Pressed Button 1\n"])
    {
        picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

        if(appDelegate.sound == 1)
        {
            [classObj ButtonSound];
        }
    }
    ///////////////////////////////////Camera//////////////////////////////

    else if([appDelegate.photoselection isEqualToString:@"User Pressed Button 2\n"]) 
    {

        @try 
        {
            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        }
        @catch (NSException * e)
        {
            UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"ALERT" 
                                                         message:@"Please try again"
                                                        delegate:self 
                                               cancelButtonTitle:nil 
                                               otherButtonTitles:@"ok", nil];
            [av show];

        }
        if(appDelegate.sound == 1)
        {
            [classObj ButtonSound];
        }
    }
    ///////////////////////////////////Cancel//////////////////////////////


    else if([appDelegate.photoselection isEqualToString:@"User Pressed Button 3\n"]) 
    {
        if(appDelegate.sound == 1)
            [classObj ButtonSound];
        return;
    }
    [self presentModalViewController:picker animated:YES];
    [picker release];
}

我该如何处理这个？拍照后请帮助我裁剪图像并保存在应用程序中，如下所示：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {

    iRolegameAppDelegate *appDelegate = (iRolegameAppDelegate *)[[UIApplication sharedApplication]delegate];

    if(appDelegate.sound == 1)
    {
        [classObj ButtonSound];
    }

    [picker dismissModalViewControllerAnimated:YES];
    imageView.image = image;
    CGSize size = [imageView.image size];
    CGRect cropRect = CGRectMake(0.0, 0.0, size.width, size.height);

    NSValue *cropRectValue = [editingInfo objectForKey:@"UIImagePickerControllerCropRect"];
    cropRect = [cropRectValue CGRectValue];

    appDelegate.slectedimage = image; 
    imageView.hidden = YES;

    if( [appDelegate.Name length] != 0 && max_att == 15)
    {
        btnNotDone.hidden   = YES;
        btnDone.enabled = YES;
    }

    //IMAGE SAVE IN DOCUMENTS//////
    [UIImagePNGRepresentation(image) writeToFile:[self findUniqueSavePath] atomically:YES];
    // Show the current contents of the documents folder
    CFShow([[NSFileManager defaultManager] directoryContentsAtPath:[NSHomeDirectory() stringByAppendingString:@"/Documents"]]);




}

请帮助我。我想删除所有警告。

Answer 1

您正在泄漏 UIImagePickerController。创建时自动释放它或在 dismissModalViewControllerAnimated 之后释放它。

您可能仍然会收到内存警告，照片可能会很大，尤其是在 iPhone 4 上，并且在某个时刻，您的内存中有两个照片：UIImage 和自动释放的 PNG。

PS您似乎没有使用 size 和 cropRect 所以您可以删除它们。

Answer 2

释放您的警报视图。一般来说，释放您分配的任何对象。如果您有保留属性，则为其分配一个自动释放对象。

当您收到内存警告时，您的视图控制器方法 - (void)didReceiveMemoryWarning 将被调用。在这里，您必须释放已缓存的所有不需要的对象。通常，这将是一些图像、堆栈中的视图等。

还要检查模态视图控制器中的对象是否有适当的释放。

Answer 3

您是否正在实施 -imagePickerController:didFinishPickingMediaWithInfo: ？您实施的方法已被弃用。即使对于图像，您也应该使用其他方法。你用录制的视频做什么？

顺便说一句，以下代码 -

@try 
{
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
}
@catch (NSException * e)
{
    UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"ALERT" 
                                                message:@"Please try again"
                                               delegate:self 
                                      cancelButtonTitle:nil 
                                      otherButtonTitles:@"ok", nil];
    [av show];
}

应该是

if ( [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera] ) {
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
} else {
    UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"ALERT" 
                                                 message:@"Camera isn't available"
                                                delegate:self 
                                       cancelButtonTitle:nil 
                                       otherButtonTitles:@"ok", nil];
    [av show];
    [av release]
}

现在更聪明的事情是禁用按钮 2，这将是

if ( ![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera] ) {
    button2.enabled = N0;
}