解决保存图片或重绘图片后旋转90度的方法

 UIImagePickerController选取图片后在判断图片方向，解决保存图片或重绘图片后旋转90度的方法
 
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[picker dismissModalViewControllerAnimated:YES];
NSString* mediaType=[info objectForKey:UIImagePickerControllerMediaType];
if([mediaType isEqualToString:(NSString*)kUTTypeImage])//@"public.image"
{
UIImage* image=[info objectForKey:UIImagePickerControllerOriginalImage];
UIImageOrientation imageOrientation=image.imageOrientation;
if(imageOrientation!=UIImageOrientationUp)
{
// 原始图片可以根据照相时的角度来显示，但UIImage无法判定，于是出现获取的图片会向左转９０度的现象。
// 以下为调整图片角度的部分
UIGraphicsBeginImageContext(image.size);
[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
iPortraitImageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// 调整图片角度完毕
}
}
}