文字高度自适应

//cell高度自适应
+ (CGFloat)getHighWithString:(NSString *)string withFont:(CGFloat )font width:(CGFloat)with
{

    if (string == nil || [string isKindOfClass:[NSNull class]]) {
        string = @"";
    }

    //设置 属性字典
    NSDictionary *dic = @{NSFontAttributeName:[UIFont systemFontOfSize:font]};

    CGRect rect = [string boundingRectWithSize:CGSizeMake(with, 100000000) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:dic context:nil];

    return rect.size.height;
}
+ (CGFloat)gettipHighWithString:(NSString *)string withFont:(CGFloat )font width:(CGFloat)with
{

    string = [string stringByReplacingOccurrencesOfString:@"\\r" withString:@""];
    NSArray *tips = [string componentsSeparatedByString:@"\n"];

    CGFloat height = 0;

    for (NSString *tip in tips) {

        height = height + [self getHighWithString:tip withFont:font width:with] + 5;

    }

    return height;
}