@interface UILabel (VerticalAlign)/** 顶端对齐 */-(void)alignTop;/** 底部对齐 */-(void)alignBottom;@end

-(void)alignTop{    CGSize fontSize = [self.text sizeWithAttributes:@{NSFontAttributeName:self.font}];    double finalHeight = fontSize.height * self.numberOfLines;    double finalWidth = self.frame.size.width;    CGSize theStringSize = [self.text boundingRectWithSize:CGSizeMake(finalWidth, finalHeight)                                                   options:NSStringDrawingUsesLineFragmentOrigin                                                attributes:@{NSFontAttributeName:self.font}                                                   context:nil].size;    int newLinesToPad = (finalHeight - theStringSize.height) / fontSize.height;    for(int i=0; i<newLinesToPad; i++){        self.text = [self.text stringByAppendingString:@"\n "];    }}

-(void)alignBottom{    CGSize fontSize = [self.text sizeWithAttributes:@{NSFontAttributeName:self.font}];    double finalHeight = fontSize.height * self.numberOfLines;    double finalWidth = self.frame.size.width;    CGSize theStringSize = [self.text boundingRectWithSize:CGSizeMake(finalWidth, finalHeight)                                                   options:NSStringDrawingUsesLineFragmentOrigin                                                attributes:@{NSFontAttributeName:self.font}                                                   context:nil].size;    int newLinesToPad = (finalHeight - theStringSize.height) / fontSize.height;    for(int i=0; i<newLinesToPad; i++){        self.text = [NSString stringWithFormat:@" \n%@",self.text];    }}