手机拍照或者相册选取图片缩放做头像

• (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
  [picker dismissViewControllerAnimated:YES completion:^{}];
  UIImage *photo = info[UIImagePickerControllerOriginalImage];

  if ((photo.size.width > 100) || photo.size.height > 100 ) {
  UIImage * smallImage = [self scaleFromImage:photo toSize:CGSizeMake(100, 100)];
  self.request = [HHUtils uploadImage:smallImage delegate:self];

    [picker dismissViewControllerAnimated:YES completion:nil];
  

  }else{
  // UIImage *photo = [UIImage imageNamed:@"cf_QQ"];
  self.request = [HHUtils uploadImage:photo delegate:self];

  [picker dismissViewControllerAnimated:YES completion:nil];
  }
  }

• (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {

  [picker dismissViewControllerAnimated:YES completion:nil];
  }

pragma mark ----------- 改变图像的尺寸，方便上传服务器

• (UIImage *) scaleFromImage: (UIImage *) image toSize: (CGSize) size
  ｛
  UIGraphicsBeginImageContext(size);
  [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
  UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return newImage;
  }

• (UIImage *)thumbnailWithImageWithoutScale:(UIImage )image size:(CGSize)asize{
  UIImage newimage;
  if (nil == image) {
  newimage = nil;
  }else{
  CGSize oldsize = image.size;
  CGRect rect;
  if (asize.width/asize.height > oldsize.width/oldsize.height) {
  rect.size.width = asize.heightoldsize.width/oldsize.height;
  rect.size.height = asize.height;
  rect.origin.x = (asize.width - rect.size.width)/2;
  rect.origin.y = 0;
  }else{
  rect.size.width = asize.width;
  rect.size.height = asize.widtholdsize.height/oldsize.width;
  rect.origin.x = 0;
  rect.origin.y = (asize.height - rect.size.height)/2;
  }
  UIGraphicsBeginImageContext(asize);
  CGContextRef context = UIGraphicsGetCurrentContext();
  CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);
  UIRectFill(CGRectMake(0, 0, asize.width, asize.height));//clear background
  [image drawInRect:rect];
  newimage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  }
  return newimage;
  }