在UITableViewCell中调整UIImageView的大小

问题描述

我有一个16x16像素的图像，我想显示在UIImageView。到目前为止，没有问题，但是16x16有点小，所以我想调整图像视图到32x32，从而也缩放图像。
但是我不能让它工作，它总是显示与16x16的图像，无论我试试。我googled了很多，并发现很多片段这里在Stack Overflow，但它仍然不工作。
这里是我的代码到目前为止：

  [[cell.imageView layer] setMagnificationFilter：kCAFilterNearest]; 
 [cell.imageView setAutoresizingMask：UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight]; 
 [cell.imageView setClipsToBounds：NO]; 
 [cell.imageView setFrame：CGRectMake（0，0，32，32）]; 
 [cell.imageView setBounds：CGRectMake（0，0，32，32）]; 
 [cell.imageView setImage：image]; 
  

我不想创建一个新的32x32像素图像，因为我已经有一些内存问题设备和创建两个图像，而不是只有一个看起来像一个非常糟糕的方法对我来说（图像可以完美地缩放，如果他们失去质量没有关系）。

  cell.imageView.image = cellImage; 
 //self.rowWidth是所需的宽度
 //self.rowHeight是所需的高度
 CGFloat widthScale = self.rowWidth / cellImage.size.width; 
 CGFloat heightScale = self.rowHeight / cellImage.size.height; 
 //这行就行了！ 
 cell.imageView.transform = CGAffineTransformMakeScale（widthScale，heightScale）; 
  

I have a 16x16 pixel image that I want to display in an UIImageView. So far, no problem, however 16x16 is a bit small so I want to resize the image view to 32x32 and thus also scale the image up.But I can't get it to work, it always shows the image with 16x16, no matter what I try. I googled a lot, and found many snippets here on Stack Overflow, but its still doesn't work.Here is my code so far:

[[cell.imageView layer] setMagnificationFilter:kCAFilterNearest];
[cell.imageView setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];
[cell.imageView setClipsToBounds:NO];
[cell.imageView setFrame:CGRectMake(0, 0, 32, 32)];
[cell.imageView setBounds:CGRectMake(0, 0, 32, 32)];
[cell.imageView setImage:image];

I don't want to create a new 32x32 pixel image because I already have some memory problems on older devices and creating two images instead of having just one looks like a very bad approach to me (the images can be perfectly scaled and it doesn't matter if they lose quality).

解决方案

I have successfully made it using CGAffineTransformMakeScale!

cell.imageView.image = cellImage;
//self.rowWidth is the desired Width
//self.rowHeight is the desired height
CGFloat widthScale = self.rowWidth / cellImage.size.width;
CGFloat heightScale = self.rowHeight / cellImage.size.height;
//this line will do it!
cell.imageView.transform = CGAffineTransformMakeScale(widthScale, heightScale);

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