UIlabel文字两边对齐

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