内存警告UIImagepickerController IOS 7 [英] Memory Warning UIImagepickerController IOS 7
问题描述
任何人都可以帮我解决这个问题我对目标c和iOS有点新意。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，它只是启动相机拍照并通过电子邮件发送到我们的服务器。这段代码在iOS6中运行得很好。
Could anybody help me with this issue I'm a bit new to objective c and iOS. I've been working on it but I can't figure out how to fix the problem, My app is really simple it only start the camera take pictures and send them through email to our server. This code was working just fine in iOS6.
当我拍照时，我的内存是每次屏幕捕获的堆增长，我得到收到的内存警告，最后 - 终止到期记忆压力。 -
When I take pictures my memory is heap growth with each screen capture and I get "Received Memory Warning" and finally - Terminated due to Memory Pressure. -
-(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, image.size.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
break;
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, 0, image.size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
case UIImageOrientationUp:
case UIImageOrientationUpMirrored:
break;
}
switch (image.imageOrientation) {
case UIImageOrientationUpMirrored:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationLeftMirrored:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, image.size.height, 0);
transform = CGAffineTransformScale(transform, -1, 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, image.size.width, image.size.height,
CGImageGetBitsPerComponent(image.CGImage), 0,
CGImageGetColorSpace(image.CGImage),
CGImageGetBitmapInfo(image.CGImage));
CGContextConcatCTM(ctx, transform);
switch (image.imageOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
// Grr...
CGContextDrawImage(ctx, CGRectMake(0,0,image.size.height,image.size.width), image.CGImage);
break;
default:
CGContextDrawImage(ctx, CGRectMake(0,0,image.size.width,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。我将非常感谢您的帮助
probably is a memory management. I will appreciate your help
推荐答案
您使用 fixRotation 方法。但是，您还应调整大小图像。否则，图像将是巨大的，约30 MB（取决于设备）。
You're on the right track with your fixRotation method. However, you should also resize the image. Otherwise, the image will be huge, ~30 MB (depending on device).
结帐这篇博客文章关于如何正确调整图像大小。具体来说，你想要的 UIImage 类别文件是：
Checkout this blog post on how to resize images correctly. Specifically, the UIImage category files you want are these:
在后台线程上执行此操作也是个好主意。这样的东西
It's also a good idea to do this on a background thread. Something like this
- (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...
});
});
}
这篇关于内存警告UIImagepickerController IOS 7的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
