Problems with device and photo orientation when customizing uiimagepickcontroller

Background: The uiimagepickcontroller view is customized. The UI of the horizontal version is used to guide the user to take a horizontal screen shot,

Requirement: Make sure that the photo is always horizontal to the right when you confirm the photo

Device direction:

 
Typedef Enum {uideviceorientationunknown, uideviceorientationportrait, orientation, orientation, uideviceorientationlandscaperight, uideviceorientationfaceup, uideviceorientationfacedown} uideviceorientation;
 

Image direction

Typedef ns_enum (nsinteger, uiimageorientation ){

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

};

Key Aspect 1: The device direction may be any direction when the user sets the horizontal layout, rather than the expected horizontal layout. The device direction is derived from the result of the previous gravity sensing, moving across the mobile phone will not change the device direction. Point 2. Using Four Directions to describe the location of the 3D world mobile phone will lose part of the information, therefore, by default, the mobile phone screen is always oriented to the user. Method 1: rotate the image to change the pixel.

Transform = Cgaffinetransformtranslate(Transform, Self.Size.Width, 0);Transform = Cgaffinetransformrotate(Transform, M_pi_2);EngineeringSource code 
 

Https://gist.github.com/alex-cellcity/1531596 2:, to change the display

Cgimageref ciimage = self. cgimage;

Uiimage * image = [[uiimage alloc] initwithcgimage: ciimage scale: 1.0 orientation: uiimageorientationup];

Uiimage Direction problems

Http://www.cnblogs.com/smileEvday/archive/2013/05/14/UIImage.html