任何人都可以帮助我解决这个问题,我对客观的c和iOS有点新鲜.我一直在努力,但我无法弄清楚如何解决问题,我的应用程序非常简单,只有启动相机拍照并通过电子邮件发送到我们的服务器.这个代码在iOS6中工作得很好.
当我拍照时,我的内存是每个屏幕捕获的堆增长,我得到“收到内存警告”,最后 – 由于内存压力而终止. –
-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediawithInfo:(NSDictionary *)info
{
[self.popoverController2 dismisspopoverAnimated:true];
Nsstring *mediaType = [info
objectForKey:UIImagePickerControllerMediaType];
if ([mediaType isEqualToString:(Nsstring *)kUTTypeImage]) {
_image = [info
objectForKey:UIImagePickerControllerOriginalImage];
_image = [self fixrotation:_image]; //<----- increased memory when UIImageWritetoSavedPhotosAlbum is uncommented IF is comment it doesn't increased memory but after some pictures I start to get "Received Memory Warning" message until the app Crash.
if (_newMedia){
UIImageWritetoSavedPhotosAlbum(_image,self,@selector(image:finishedSavingWithError:contextInfo:),nil);
[self dismissViewControllerAnimated:NO completion:nil];
[self performSegueWithIdentifier:@"SeleccionadoCameraR" sender:self];
}else{
[self performSegueWithIdentifier:@"SeleccionadoCameraR" sender:self];
}
}
}
- (UIImage *)fixrotation:(UIImage *)image{
if (image.imageOrientation == UIImageOrientationUp) return image;
CGAffineTransform transform = CGAffineTransformIdentity;
switch (image.imageOrientation) {
case UIImageOrientationDown:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform,image.size.width,image.size.height);
transform = CGAffineTransformRotate(transform,M_PI);
break;
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform,0);
transform = CGAffineTransformRotate(transform,M_PI_2);
break;
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform,-M_PI_2);
break;
case UIImageOrientationUp:
case UIImageOrientationUpMirrored:
break;
}
switch (image.imageOrientation) {
case UIImageOrientationUpMirrored:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform,0);
transform = CGAffineTransformScale(transform,-1,1);
break;
case UIImageOrientationLeftMirrored:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform,image.size.height,1);
break;
case UIImageOrientationUp:
case UIImageOrientationDown:
case UIImageOrientationLeft:
case UIImageOrientationRight:
break;
}
// Now we draw the underlying CGImage into a new context,applying the transform
// calculated above.
CGContextRef ctx = CGBitmapContextCreate(NULL,CGImageGetBitsPerComponent(image.CGImage),CGImageGetColorSpace(image.CGImage),CGImageGetBitmapInfo(image.CGImage));
CGContextConcatCTM(ctx,transform);
switch (image.imageOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
// Grr...
CGContextDrawImage(ctx,CGRectMake(0,image.size.width),image.CGImage);
break;
default:
CGContextDrawImage(ctx,image.size.height),image.CGImage); //when I use instruments it shows that My VM is because of this
break;
}
// And Now we just create a new UIImage from the drawing context
CGImageRef cgimg = CGBitmapContextCreateImage(ctx);//also this line in Instruments
UIImage *img = [UIImage imageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;
}
可能是内存管理.我会感谢你的帮助
解决方法
您使用fixRotation方法处于正确的轨道.但是,您也应该调整图像的大小.否则,图像会很大,大约30 MB(取决于设备).
结帐this blog post如何正确调整图像大小.具体来说,您需要的UIImage类别文件是：
UIImage+Resize.h
UIImage+Resize.m
在后台线程上也是一个好主意.这样的东西
- (void)imagePickerController:(UIImagePickerController *)imagePicker didFinishPickingMediawithInfo:(NSDictionary *)info
{
// dismiss the image picker first to free its memory
[self dismissViewControllerAnimated:YES completion:nil];
UIImage *originalImage = info[UIImagePickerControllerOriginalImage];
if (!originalImage)
return;
// Optionally set a placeholder image here while resizing happens in background
dispatch_async(dispatch_get_global_queue(disPATCH_QUEUE_PRIORITY_DEFAULT,0),^{
// Set desired maximum height and calculate width
CGFloat height = 640.0f; // or whatever you need
CGFloat width = (height / originalImage.size.height) * originalImage.size.width;
// Resize the image
UIImage * image = [originalImage resizedImage:CGSizeMake(width,height) interpolationQuality:kCGInterpolationDefault];
// Optionally save the image here...
dispatch_async(dispatch_get_main_queue(),^{
// ... Set / use the image here...
});
});
}