计算文字的宽度（动态）

//交易订单数字

UILabel*TONumberLab = [[UILabel alloc] init];

TONumberLab = [self createTitleAndNumberLab:@"567" fontSize:TONumberFontSize];

CGSize TONumberLabSize = [self sizeWithText:TONumberLab.text font:TONumberLab.font fontSize:TONumberFontSize];

#pragma mark 计算文字尺寸
/**
*  计算文字尺寸
*
*  @param text    需要计算尺寸的文字
*  @param font    文字的字体
*  @param maxSize 文字的最大尺寸
*/
- (CGSize)sizeWithText:(NSString *)text font:(UIFont *)font fontSize:(CGFloat)fontSize
{
CGSize maxSize = CGSizeMake(MAXFLOAT, fontSize);
NSDictionary *attrs = @{NSFontAttributeName : font};
return [text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil].size;
}

#pragma mark 创建标题Lab
/**
*  创建标题/数字Lab
*
*  @param title    标题/数字
*  @param fontSize 标题/数字字号大小
*
*/
-(UILabel*)createTitleAndNumberLab:(NSString*)title fontSize:(CGFloat)fontSize{
//本月收款（元）
UILabel*tmpLab = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
tmpLab.font = [UIFont systemFontOfSize:fontSize];
[tmpLab setTextColor:[UIColor whiteColor]];
[tmpLab setText:title];
return tmpLab;

}

不封装计算宽度

//最新订单
    UILabel *latestOrderLab = [[UILabel alloc]init];
    [latestOrderLab setText:@"最新订单"];
    [latestOrderLab setFont:[UIFont systemFontOfSize:LatestOrderAndRefreshLabFontSize]];
    [latestOrderLab setTextColor:UIColorFromRGB(0x333333)];
    NSDictionary *attrs = @{NSFontAttributeName : latestOrderLab.font};
    CGSize maxSize = CGSizeMake(MAXFLOAT, LatestOrderAndRefreshLabFontSize);
    CGSize latestOrderLabSize = [latestOrderLab.text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil].size;
    CGFloat latestOrderLabX =SpaceLabHeight;
    CGFloat latestOrderLabY =SpaceLabHeight;
    CGFloat latestOrderLabW =latestOrderLabSize.width;
    CGFloat latestOrderLabH =latestOrderLabSize.height;
    latestOrderLab.frame = CGRectMake(latestOrderLabX, latestOrderLabY, latestOrderLabW, latestOrderLabH);
    [latestOrderAndRefreshView addSubview:latestOrderLab];