创建UILable的时候,可以根据文字算出文字所占区域大小的方法

#pragma mark -- Tool Method

/**

 *  @param text    文字内容

 *  @param font    字体

 *  @param maxSize 最大尺寸

 *

 *  @return 实际尺寸

 */

- (CGSize)labelAutoCalculateRectWith:(NSString*)text Font:(UIFont*)font MaxSize:(CGSize)maxSize

{

    NSMutableParagraphStyle* paragraphStyle = [[NSMutableParagraphStyle
alloc]init];

    paragraphStyle.lineBreakMode=NSLineBreakByWordWrapping;

    NSDictionary* attributes =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paragraphStyle.copy};

    CGSize labelSize = [text
boundingRectWithSize:maxSize
options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading|NSStringDrawingTruncatesLastVisibleLine
attributes:attributes
context:nil].size;

    labelSize.height=ceil(labelSize.height);

    labelSize.width=ceil(labelSize.width);

    return labelSize;

}