[英]Image auto-rotates after using CIFilter
我正在編寫一個應用程序,讓用戶拍照,然后進行編輯。 我正在使用UISliders實現亮度/對比度/飽和度的工具,並使用Core Image Filter類來實現。 當我打開應用程序時,我可以拍照並正確顯示。 但是,如果我選擇編輯圖片,然后使用任何描述的滑塊工具,圖像將逆時針旋轉90度。 這是有問題的代碼:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.navigationItem.hidesBackButton = YES; //hide default nav
//get image to display
DBConnector *dbconnector = [[DBConnector alloc] init];
album.moments = [dbconnector getMomentsForAlbum:album.title];
Moment *mmt = [album.moments firstObject];
_imageView.image = [mmt.moment firstObject];
CGImageRef aCGImage = _imageView.image.CGImage;
CIImage *aCIImage = [CIImage imageWithCGImage:aCGImage];
_editor = [CIFilter filterWithName:@"CIColorControls" keysAndValues:@"inputImage", aCIImage, nil];
_context = [CIContext contextWithOptions: nil];
[self startEditControllerFromViewController:self];
}
//cancel and finish buttons
- (BOOL) startEditControllerFromViewController: (UIViewController*) controller {
[_cancelEdit addTarget:self action:@selector(cancelEdit:) forControlEvents:UIControlEventTouchUpInside];
[_finishEdit addTarget:self action:@selector(finishEdit:) forControlEvents:UIControlEventTouchUpInside];
return YES;
}
//adjust brightness
- (IBAction)brightnessSlider:(UISlider *)sender {
[_editor setValue:[NSNumber numberWithFloat:_brightnessSlider.value] forKey: @"inputBrightness"];
CGImageRef cgiimg = [_context createCGImage:_editor.outputImage fromRect:_editor.outputImage.extent];
_imageView.image = [UIImage imageWithCGImage: cgiimg];
CGImageRelease(cgiimg);
}
我認為問題源於brightnessSlider
方法,基於我放置的斷點。 有沒有辦法阻止我的照片自動旋轉? 如果沒有,我該如何將其旋轉回正常方向?
發布后幾分鍾,我找到了自己問題的答案。 去搞清楚。 無論如何,我只是將滑塊方法更改為以下內容:
- (IBAction)brightnessSlider:(UISlider *)sender {
[_editor setValue:[NSNumber numberWithFloat:_brightnessSlider.value] forKey: @"inputBrightness"];
CGImageRef cgiimg = [_context createCGImage:_editor.outputImage fromRect:_editor.outputImage.extent];
UIImageOrientation originalOrientation = _imageView.image.imageOrientation;
CGFloat originalScale = _imageView.image.scale;
_imageView.image = [UIImage imageWithCGImage: cgiimg scale:originalScale orientation:originalOrientation];
CGImageRelease(cgiimg);
}
這只是記錄圖像的原始方向和比例,並在數據轉換回UIImage時重新設置它們。 希望這有助於其他人!
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.