NSImageView图像纵横比填充?

问题描述

所以我习惯了UIImageView，并且能够设置如何在其中显示图像的不同方式.例如AspectFill模式等...

So I am used to UIImageView, and being able to set different ways of how its image is displayed in it. Like for example AspectFill mode etc...

我想在Mac应用程序上使用NSImageView完成相同的操作.在这方面NSImageView是否与UIImageView类似，或者我将如何在NSImageView中显示图像并选择显示图像的不同方式?

I would like to accomplish the same thing using NSImageView on a mac app. Does NSImageView work similarly to UIImageView in that regard or how would I go about showing an image in an NSImageView and picking different ways of displaying that image?

推荐答案

您可能会发现，将NSView子类化并提供CALayer可以满足您的需要，这要容易得多.这是NSView子类的init外观.

You may find it much easier to subclass NSView and provide a CALayer that does the aspect fill for you. Here is what the init might look like for this NSView subclass.

- (id)initWithFrame:(NSRect)frame andImage:(NSImage*)image
{
  self = [super initWithFrame:frame];
  if (self) {
    self.layer = [[CALayer alloc] init];
    self.layer.contentsGravity = kCAGravityResizeAspectFill;
    self.layer.contents = image;
    self.wantsLayer = YES;
  }
  return self;
}

请注意，设置图层，然后设置wantLayer的顺序非常重要(如果您先设置了wantLayer，则会获得默认的支持层).

Note that the order of setting the layer, then settings wantsLayer is very important (if you set wantsLayer first, you'll get a default backing layer instead).

您可以使用setImage方法来简单地更新图层的内容.

You could have a setImage method that simply updates the contents of the layer.

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