ivan.m 垂直式對齊 UILabel（https://discussions.apple.com/thread/1759957?tstart=0）

VerticalUILabel.h

// Label2.h
// (c) 2009 Ivan Misuno, www.cuberoom.biz

#import <UIKit/UIKit.h>

typedef enum
{
    VerticalAlignmentTop = 0, // default
    VerticalAlignmentMiddle,
    VerticalAlignmentBottom,
} VerticalAlignment;

@interface Label2 : UILabel
{
@private
    VerticalAlignment _verticalAlignment;
}

@property (nonatomic) VerticalAlignment verticalAlignment;

@end