// fullScreenImage可以直接初始化为UIImageUIImage *tempImg = [UIImage imageWithCGImage:asset.defaultRepresentation.fullScreenImage];// 需传入方向和缩放比例，否则方向和尺寸都不对UIImage *tempImg = [UIImage imageWithCGImage:asset.defaultRepresentation.fullResolutionImage                                        scale:asset.defaultRepresentation.scale                                  orientation:(UIImageOrientation)asset.defaultRepresentation.orientation];

Note: 在iPhone6+上，fullScreenImage获取的尺寸  如果为x， 那么fullResolutionImage获取的图片尺寸则为x/3.