//获取字符串的宽度

-(float)widthForString:(NSString *)value fontSize:(float)fontSize andHeight:(float)height

{

    UIColor  *backgroundColor=[UIColor blackColor];

    UIFont *font=[UIFont boldSystemFontOfSize:fontSize];

    CGRect sizeToFit = [value boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, height) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{

                                                                                                                                             NSForegroundColorAttributeName:backgroundColor,

                                                                                                                                             NSFontAttributeName:font

                                                                                                                                             } context:nil];

    return sizeToFit.size.width;

}

//获得字符串的高度

-(float) heightForString:(NSString *)value fontSize:(float)fontSize andWidth:(float)width

{

    UIColor  *backgroundColor=[UIColor blackColor];

    UIFont *font=[UIFont boldSystemFontOfSize:18.0];

    CGRect sizeToFit = [value boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{

                                       NSForegroundColorAttributeName:backgroundColor,

                                       NSFontAttributeName:font

                                       } context:nil];

    return sizeToFit.size.height;

}