UICollectionview基於圖像高度設置單元格高度

Question

嗨，我想根據從url獲取的圖像設置UICollectionView單元格的高度。誰能幫我？我已經檢查了一些圖書館，他們給了細胞隨機高度。 In this one給予細胞的隨機高度。當我嘗試給圖像高度like this它給予result。空間來自細胞之間。

並且還嘗試like this但單元行之間沒有工作空間。 see this

Answer 1

Write in ViewDidLoad Method 

    for (int i=0; i<[imageURLArray count]; i++) 
     { 
      //Declare Globally 
      IMGArray1=[[NSMutableArray alloc] init]; 

      NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:[imageURLArray objectAtIndex:i]]]; 
      NSOperationQueue *urlQue = [[NSOperationQueue alloc] init]; 
      [NSURLConnection sendAsynchronousRequest:urlRequest queue:urlQue completionHandler:^(NSURLResponse *response, 
                           NSData *MoblieDatadata, NSError *error) 
      { 
       if ([MoblieDatadata length] >0 && error == nil) 
       { 
        UIImage *image = [[UIImage alloc]initWithData:MoblieDatadata]; 
        [IMGArray1 addObject:image]; 

       } 
       else if ([MoblieDatadata length] == 0 && error == nil) 
       { 

        NSLog(@"Nothing was downloaded."); 



       } 
       else if (error != nil) 
       { 
        NSLog(@"Error happened = %@", error); 
        dispatch_async(dispatch_get_main_queue(), ^{ 


        }); 
       } 
      }]; 


    -(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView 
        cellForItemAtIndexPath:(NSIndexPath *)indexPath 
    { 
     examplemycell *myCell = [collectionView 
             dequeueReusableCellWithReuseIdentifier:@"cell" 
             forIndexPath:indexPath]; 

     UIImage *image; 
     int row = [indexPath row]; 

     image = [UIImage imageNamed:IMGArray1[row]]; 

     myCell.imageView.image = image; 

     return myCell; 
    } 
    #pragma mark - 
    #pragma mark UICollectionViewFlowLayoutDelegate 

    -(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath 
    { 
     UIImage *image; 
     int row = [indexPath row]; 

     image = [UIImage imageNamed:IMGArray1[row]]; 

     return image.size; 
    } 

//For setting spacing between collectionview cells 
//use the delegate method like 

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionView *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section 
    { 
    return 10; // This is the minimum inter item spacing, can be more 
    } 

And Use this for verticle line spacing between cells 

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section 
{ 
    return 5; 
} 

Answer 2

可以設置高度可變

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize { 
      return CGSize(width: 100, height: myHeight) 
     } 
} 

如果你的鏡像下載，請致電： MyCollectionView.collectionViewLayout.invalidateLayout()

的問題是老了，但還是實際