本篇IOS应用开发教程将为大家讲解iOS之动态计算文字的高度，看完这篇文章会让你对IOS编程的知识点有更加清晰的理解和运用。

+ (CGSize)boundingALLRectWithSize:(NSString *)txt Font:(UIFont *)font Size:(CGSize)size {    

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:txt];

    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];

    [style setLineSpacing:2.0f];//切记LineSapcing >= 2,不然会显示不全

    [attributedString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, [txt length])];

    CGSize realSize = CGSizeZero;

#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1

    CGRect textRect = [txt boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font, NSParagraphStyleAttributeName:style} context:nil];

    realSize = textRect.size;#else

    realSize = [txt sizeWithFont:font constrainedToSize:size];#endif

    realSize.width = ceilf(realSize.width);

    realSize.height = ceilf(realSize.height);

    return realSize;

}

调用：float strHeight = [Util boundingALLRectWithSize:str Font:[UIFont systemFontOfSize:14] Size:CGSizeMake(SCREEN_WIDTH-24, MAXFLOAT)].height;

希望这篇文章可以帮助到你。总之，同学们，你想要的职坐标IOS频道都能找到!