英文:
UITableViewCell Height Issue
问题
我实际上正在尝试使图像视图的高度动态化。
我已经尝试过 UITableViewAutomaticDimension。
在单元格类中，我已根据纵横比约束设置了图像的动态高度。
英文:
I'm actually trying to make the image view height dynamic
I have tried UITableViewAutomaticDimension
in the cell class I have set the image's dynamic height based on the aspect constraint
答案1
得分: 1
你可以使用UITableViewAutomaticDimension来实现基于图像约束的单元格的动态高度。
但是，图像的高度和宽度可以帮助你实现这一目标。关于这个问题有很多帮助可在以下答案中找到：
https://stackoverflow.com/questions/32281886/dynamic-uiimageview-size-within-uitableview
英文:
Well, you can't achieve the dynamic height of cell with UITableViewAutomaticDimension on the basis of image's constraints.
BUT image's height and width can help you in this. There is a plenty of help regarding this issue is available in following answer:
https://stackoverflow.com/questions/32281886/dynamic-uiimageview-size-within-uitableview
答案2
得分: 0
- 确保你在Storyboard中设置了从顶部到底部的约束。
- 将缩略图图像保存为数据到本地存储（我正在使用Core Data）。
- 使用缩略图图像，计算图像的纵横比。
- 自定义
heightForRowAt方法中的行高，如您所需。
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
let entity = self.fetchedResultController.object(at: indexPath as IndexPath) as! Message
var newh: CGFloat = 100.00
if let fileThumbnails = entity.file_thumbnails as? NSArray {
if fileThumbnails.count != 0 {
fileThumbnails.map { (thumbNail) in
newh = self.getImageHeight(image: UIImage(data: thumbNail as! Data)!, h: UIImage(data: thumbNail as! Data)!.size.height, w: UIImage(data: thumbNail as! Data)!.size.width)
}
}
}
if entity.fileStatus == "DeletedMedia" {
newh = 100
}
if entity.fileStatus == nil {
newh = 0.0
}
print("newH", newh)
return newh
}
func getImageHeight(image: UIImage, h: CGFloat, w: CGFloat) -> CGFloat {
let aspect = image.size.width / image.size.height
var newH = (messagesTV.frame.size.width * 0.6) / aspect
// 自定义以获得所需的输出
if newH > 500 {
newH = 500
// 最大高度为500
}
if newH < 100 {
newH = 100
// 最小高度为100
}
return newH
}
如果本地存储中的缩略图图像被删除，那么将显示一个占位图像。您可以自定义newH变量以获得所需的输出。
英文:
- make sure you have set top-bottom constraints in storyboard.
- save the thumbnail image as data to local storage (I'm using core data)
- using the thumb image, calculate the aspect of the image
- customise the row height as you want in
heightForRowAtmethod.
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
let entity = self.fetchedResultController.object(at: indexPath as IndexPath) as! Message
var newh:CGFloat = 100.00
if let fileThumbnails = entity.file_thumbnails as? NSArray{
if fileThumbnails.count != 0{
fileThumbnails.map { (thumbNail) in
newh = self.getImageHeight(image:UIImage(data: thumbNail as! Data)! , h: UIImage(data: thumbNail as! Data)!.size.height , w: UIImage(data: thumbNail as! Data)!.size.width)
}
}
}
if entity.fileStatus == "DeletedMedia" {
newh = 100
}
if entity.fileStatus == nil{
newh = 0.0
}
print ("newH " , newh)
return newh
}
func getImageHeight(image : UIImage, h : CGFloat, w : CGFloat) -> CGFloat {
let aspect = image.size.width / image.size.height
var newH = (messagesTV.frame.size.width * 0.6) / aspect
// customise as you want in newH
if(newH > 500){
newH = 500
//maximum height 500
}
if(newH < 100){
newH = 100
//minimum height = 100
}
return newH
}
if the thumb image is deleted in local storage then a placeholder image will be shown.
you can customise the newHvariable to get the desired output
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