iphone桌面上的某些圖像會自動旋轉

我擁有專輯表中的照片數據庫。我得到陣列中的所有圖像並顯示在表格中。問題是很少的圖像旋轉90度。iphone桌面上的某些圖像會自動旋轉

這是cellForRow方法。

AlbumInformation * temp=[albumInfoArray objectAtIndex:indexPath.row]; 
cell.albumPicImageView.image=temp.albumPictureClass; 
return cell;

我得到所有圖像，但很少旋轉。

請幫忙。

在此先感謝

來源

2013-01-11 Durgaprasad

UIImage有一個賦值屬性「imageOrientation」; 所以這種方法可以幫助你

（的UIImage *）fixOrientation：（的UIImage *）aImage {

// No-op if the orientation is already correct 
if (aImage.imageOrientation == UIImageOrientationUp) 
    return aImage; 

// We need to calculate the proper transformation to make the image upright. 
// We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored. 
CGAffineTransform transform = CGAffineTransformIdentity; 

switch (aImage.imageOrientation) { 
    case UIImageOrientationDown: 
    case UIImageOrientationDownMirrored: 
     transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height); 
     transform = CGAffineTransformRotate(transform, M_PI); 
     break; 

    case UIImageOrientationLeft: 
    case UIImageOrientationLeftMirrored: 
     transform = CGAffineTransformTranslate(transform, aImage.size.width, 0); 
     transform = CGAffineTransformRotate(transform, M_PI_2); 
     break; 

    case UIImageOrientationRight: 
    case UIImageOrientationRightMirrored: 
     transform = CGAffineTransformTranslate(transform, 0, aImage.size.height); 
     transform = CGAffineTransformRotate(transform, -M_PI_2); 
     break; 
    default: 
     break; 
} 

switch (aImage.imageOrientation) { 
    case UIImageOrientationUpMirrored: 
    case UIImageOrientationDownMirrored: 
     transform = CGAffineTransformTranslate(transform, aImage.size.width, 0); 
     transform = CGAffineTransformScale(transform, -1, 1); 
     break; 

    case UIImageOrientationLeftMirrored: 
    case UIImageOrientationRightMirrored: 
     transform = CGAffineTransformTranslate(transform, aImage.size.height, 0); 
     transform = CGAffineTransformScale(transform, -1, 1); 
     break; 
    default: 
     break; 
} 

// Now we draw the underlying CGImage into a new context, applying the transform 
// calculated above. 
CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height, 
             CGImageGetBitsPerComponent(aImage.CGImage), 0, 
             CGImageGetColorSpace(aImage.CGImage), 
             CGImageGetBitmapInfo(aImage.CGImage)); 
CGContextConcatCTM(ctx, transform); 
switch (aImage.imageOrientation) { 
    case UIImageOrientationLeft: 
    case UIImageOrientationLeftMirrored: 
    case UIImageOrientationRight: 
    case UIImageOrientationRightMirrored: 
     // Grr... 
     CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage); 
     break; 

    default: 
     CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage); 
     break; 
} 

// And now we just create a new UIImage from the drawing context 
CGImageRef cgimg = CGBitmapContextCreateImage(ctx); 
UIImage *img = [UIImage imageWithCGImage:cgimg]; 
CGContextRelease(ctx); 
CGImageRelease(cgimg); 
return img;

}

來源

2013-01-11 11:41:51 iuser1969782

我得到的圖像定位爲所有圖像，但一些圖像旋轉我試過如果（temp.albumPictureClass == UIImageOrientationUP）{NSLog（@「Up」）;}所有圖像打印此消息 – Durgaprasad

這意味着您的圖像方向都是「向上」。所以我認爲你可以找到行哪個圖像旋轉90度，然後通過代碼旋轉它們......我的英語非常糟糕，所以我不能確定你能理解我說的話。 - ！抱歉！ – iuser1969782

是的，我明白了。我接受了你的方法。這是完美的。謝謝。 – Durgaprasad

請參閱下面的示例。在以下兩種情況下的PhotoDisplayViewController.m測試中，您將自動得到答案，無需解釋任何人。

案例1：UIImageOrientation

ALAssetRepresentation *assetRepresentation = [asset defaultRepresentation]; 

    UIImage *fullScreenImage = [UIImage imageWithCGImage:[assetRepresentation fullScreenImage] scale:[assetRepresentation scale] orientation:(UIImageOrientation)[assetRepresentation orientation]];

案例2：用了UIImageOrientation

ALAssetRepresentation *assetRepresentation = [asset defaultRepresentation]; 

    UIImage *fullScreenImage = [UIImage imageWithCGImage:[assetRepresentation fullScreenImage] scale:[assetRepresentation scale] orientation:nil];

當您從您的閱讀主張有一定的取向就像下面

UIImageOrientationUp,   // default orientation 
    UIImageOrientationDown,   // 180 deg rotation 
    UIImageOrientationLeft,   // 90 deg CCW 
    UIImageOrientationRight,   // 90 deg CW 
    UIImageOrientationUpMirrored, // as above but image mirrored along other axis. horizontal flip 
    UIImageOrientationDownMirrored, // horizontal flip 
    UIImageOrientationLeftMirrored, // vertical flip 
    UIImageOrientationRightMirrored, // vertical flip

所以請下載通過這個示例演示

MyImagePicker Demo

注：，如果你想從那麼所有的專輯，你需要在RootViewController.m改變代碼如下

NSUInteger groupTypes = ALAssetsGroupAlbum | ALAssetsGroupEvent | ALAssetsGroupFaces|ALAssetsGroupLibrary|ALAssetsGroupSavedPhotos|ALAssetsGroupPhotoStream;

顯示

來源

2013-01-11 11:39:24

iphone桌面上的某些圖像會自動旋轉

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