获取固定宽度字符串的高度，适用于自适应UILabel TableViewCell

+(CGFloat)getStringHight:(NSString*)l_str_input font:(UIFont*)l_font width:(CGFloat)l_width{ if (l_str_input == nil || l_font == nil || l_width <= 0) { return0.0f; }
CGSize l_size = CGSizeMake(l_width, MAXFLOAT);
if ( [[[UIDevicecurrentDevice] systemVersion] floatValue]>=7.0 ) {
NSDictionary *attributesDictionary = [NSDictionarydictionaryWithObjectsAndKeys: l_font, NSFontAttributeName, nil];
CGSize textSize = [l_str_input boundingRectWithSize:l_size//用于计算文本绘制时占据的矩形块 options:NSStringDrawingUsesLineFragmentOrigin//文本绘制时的附加选项 attributes:attributesDictionary// 文字的属性 context:nil].size; return textSize.height; }else{
CGSize textSize = [l_str_input sizeWithFont:l_font constrainedToSize:l_size lineBreakMode:NSLineBreakByWordWrapping];
return textSize.height;
}}

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