UIImage UIImageOrientationRight example ios

UIImageOrientation - UIImageOrientationRight

Specifies the possible orientations of an image.

typedef enum {
   UIImageOrientationUp,
   UIImageOrientationDown,   // 180 deg rotation
   UIImageOrientationLeft,   // 90 deg CW
   UIImageOrientationRight,   // 90 deg CCW
   UIImageOrientationUpMirrored,    // as above but image mirrored along
   // other axis. horizontal flip
   UIImageOrientationDownMirrored,  // horizontal flip
   UIImageOrientationLeftMirrored,  // vertical flip
   UIImageOrientationRightMirrored, // vertical flip
} UIImageOrientation;

Constants

UIImageOrientationUp

The default orientation of images. The image is drawn right-side up, as shown here. 

Available in iOS 2.0 and later.

Declared in UIImage.h.

UIImageOrientationDown

The image is rotated 180 degrees, as shown here. 

Available in iOS 2.0 and later.

Declared in UIImage.h.

UIImageOrientationLeft

The image is rotated 90 degrees clockwise, as shown here. 

Available in iOS 2.0 and later.

Declared in UIImage.h.

UIImageOrientationRight

The image is rotated 90 degrees counterclockwise, as shown here. 

Available in iOS 2.0 and later.

Declared in UIImage.h.

Example of UIImageOrientationRight

static inline double radians (double degrees) {return degrees * M_PI/180;}
UIImage* rotate(UIImage* src, UIImageOrientation orientation)
{
    UIGraphicsBeginImageContext(src.size);

    CGContextRef context = UIGraphicsGetCurrentContext();

    if (orientation == UIImageOrientationRight) {
        CGContextRotateCTM (context, radians(90));
    } else if (orientation == UIImageOrientationLeft) {
        CGContextRotateCTM (context, radians(-90));
    } else if (orientation == UIImageOrientationDown) {
        // NOTHING
    } else if (orientation == UIImageOrientationUp) {
        CGContextRotateCTM (context, radians(90));
    }

    [src drawAtPoint:CGPointMake(0, 0)];

    return UIGraphicsGetImageFromCurrentImageContext();
}

Example of UIImageOrientationRight