網址：http://blog.csdn.net/djl4104804/article/details/39472243
//動態設置cell的高度
+ (CGFloat)heightForRowWithModel:(PhotoInfo *)photoInfo
{
//1.圖片的高度
//讓圖片等比例縮放
//(1)獲取圖片
UIImage *image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"ZZ" ofType:@"png"]];
CGFloat imageHeight = [self heightForImage:image];
//2.文本的高度
CGFloat textHeight = [self heightForText:photoInfo.introduction];
//3.返回cell 的總高度
return kPhotoCell_TitleLabel_Height + imageHeight + textHeight + 4 * kPhotoCell_MarginBetween;
}
//單獨計算圖片的高度
+ (CGFloat)heightForImage:(UIImage *)image
{
//(2)獲取圖片的大小
CGSize size = image.size;
//(3)求出縮放比例
CGFloat scale = kPhotoCell_Width / size.width;
CGFloat imageHeight = size.height * scale;
return imageHeight;
}
//單獨計算文本的高度
+ (CGFloat)heightForText:(NSString *)text
{
//設置計算文本時字體的大小,以什么標準來計算
NSDictionary *attrbute = @{NSFontAttributeName:[UIFont systemFontOfSize:kFontSize]};
return [text boundingRectWithSize:CGSizeMake(kPhotoCell_Width, 1000) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:attrbute context:nil].size.height;
}
