//定义宏:
#define kFontSize
14
#define kPhotoCell_Width
300
#define kPhotoCell_MarginBetween
3
#define kPhotoCell_TitleLabel_Height
25
//方法:
+ (CGFloat)heightForRowWithModel:(PhotoInfo *)photoInfo
{
//1.图片的高度
//让图片等比例缩放
//(1)获取图片
UIImage *image = [UIImage
imageWithContentsOfFile:[[NSBundle
mainBundle] pathForResource:@"TSummer"
ofType:@"png"]];
//(2)计算图片的高度
CGFloat imageHeight = [self
heightForImage:image];
//2.文本的高度
CGFloat textHeight = [self
heightForText:photoInfo.introduction];
//3.返回cell 的总高度
return kPhotoCell_TitleLabel_Height + imageHeight + textHeight +
4 * kPhotoCell_MarginBetween;
}
//单独计算图片的高度
+ (CGFloat)heightForImage:(UIImage *)image
{
//(1)获取图片的大小
CGSize size = image.size;
//(2)求出缩放比例
CGFloat scale = kPhotoCell_Width / size.width;
CGFloat imageHeight = size.height * scale;
return imageHeight;
}
//单独计算文本的高度
+ (CGFloat)heightForText:(NSString *)text
{
//设置计算文本时字体的大小,以什么标准来计算
NSDictionary *attrbute = @{NSFontAttributeName:[UIFont
systemFontOfSize:kFontSize]};
return [text boundingRectWithSize:CGSizeMake(kPhotoCell_Width,
1000) options:(NSStringDrawingUsesFontLeading |
NSStringDrawingUsesLineFragmentOrigin) attributes:attrbute
context:nil].size.height;
}