Question

我按下按钮打开相机并拍摄uiimage中的图像，然后将该图像传输到其他视图但是当我这样做4-5次时，我会收到记忆警告。

以下是我工作的代码： -

-(void)imagePickerController:(UIImagePickerController*)picker_camera didFinishPickingMediaWithInfo:(NSDictionary*)info
{
    [picker_camera dismissModalViewControllerAnimated:YES];
    UIImage *image=[[UIImage alloc] init];
    image=[info objectForKey:@"UIImagePickerControllerOriginalImage"];

    [self Methodcall:image];
    //Image_camera=image;
   // NSAutoreleasePool *apool = [[NSAutoreleasePool alloc] init];
    //printf("first\n");

   // [self performSelector:@selector(Methodcall) withObject:nil afterDelay:1];

    //printf("ok\n");
    //[apool release];

}
-(void)Methodcall:(UIImage *)image{
    ImageDisplayViewController *ImageDisplayViewController_obj=[[ImageDisplayViewController alloc] initWithNibName:@"ImageDisplayViewController" bundle:nil];
    ImageDisplayViewController_obj.image_FRomCamera=image;
    NSLog(@"image===>%@    camera==>%@",image,ImageDisplayViewController_obj.image_FRomCamera);
    [self.navigationController pushViewController:ImageDisplayViewController_obj animated:YES];
   // [ImageDisplayViewController_obj release];
}

-(IBAction)TakePhotoCamera:(id)sender{
    @try
    {
        UIImagePickerController *picker_camera = [[UIImagePickerController alloc] init];
        picker_camera.sourceType = UIImagePickerControllerSourceTypeCamera;
        picker_camera.delegate = self;

        [self presentModalViewController:picker_camera animated:YES];
        [picker_camera release];
    }
    @catch (NSException *exception)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Camera" message:@"Camera is not available  " delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
        [alert show];
        [alert release];
    }
}

是否有人帮助我。

提前致谢。

Answer 1

我假设您没有使用ARC（这有什么特别的原因吗？）

首先，您要分配一个从未使用过的UIImage实例：

UIImage *image=[[UIImage alloc] init];
image=[info objectForKey:@"UIImagePickerControllerOriginalImage"];

应更改为：

UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

接下来，您不会在此处发布ImageDisplayViewController_obj个实例：
```
// [ImageDisplayViewController_obj release];
```
取消注释此行。

内存管理的黄金法则：始终释放您不再需要的对象，不要保留任何您不需要的内容。

如果您不熟悉Obj-C和/或内存管理，我强烈建议您使用ARC。

其他一些建议：

How to check existence of camera?
Avoid exceptions
Follow coding conventions - 请勿为变量命名picker_camera（使用pickerCamera）或ImageDisplayViewController_obj（使用imageController或imageVC）。

将图像选取器摄像机传输到另一个视图时的内存警告

1 个答案: