/**

 * 获得字符串的size

 * &-string 待传入字符串

 * &-Font 待传入字符串字体大小

 * &-MaxSize 待传入字符串最大宽高

 * 返回 CGSize

 */

+ (CGSize)sizeWithString:(NSString *)string Font:(UIFont *)font MaxSize:(CGSize)size;

/**

 * 获得字符串的size

 */

+(CGSize)sizeWithString:(NSString *)string Font:(UIFont *)font MaxSize:(CGSize)size{

   

    CGRect rect = [string boundingRectWithSize:size//限制最大的宽度和高度

                                       options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading  |NSStringDrawingUsesLineFragmentOrigin//采用换行模式

                                    attributes:@{NSFontAttributeName: font}//传入的字体字典

                                       context:

nil];

   

  

  return rect.size;

   

   

}