IOS计算字符串的长度和宽度

+ (CGSize ) width:(CGFloat)width heigth:(CGFloat)heigth content:(NSString *)content fontSize:(UIFont*)fontSize
{
    CGSize maxSize=CGSizeMake(width, heigth);
    CGSize contentSize=[content sizeWithFont:fontSize constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
    return contentSize;
}

CGSize size1 = [DYConstants width:220 heigth:1000 content:[self.giftInfo objectForKey:@"scope"] fontSize:[UIFont systemFontOfSize:14]];