iOS开发 UIlabel 文字两边对齐
思路：算出每个字符之间的宽度
给UIlabel添加一个分类即可，代码如下：
* 必须导入这个头文件：CoreText/CoreText.h
- (void)changeAlignmentRightandLeft{
CGRect textSize = [self.text boundingRectWithSize:CGSizeMake(self.frame.size.width, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine |NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName : self.font} context:nil];
CGFloat margin = (self.frame.size.width - textSize.size.width) / (self.text.length - 1);// 每个字符之间，平均的宽度（点坐标）
NSNumber *number = [NSNumber numberWithFloat:margin];
NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc]initWithString:self.text];
[attributeString addAttribute:(id)kCTKernAttributeName value:number range:NSMakeRange(0, self.text.length - 1)];
self.attributedText = attributeString;
}
http://blog.csdn.net/u013094208/article/details/52777225