Question

这很神秘，而且超出我的理解。我尝试将NSImage分配给NSImageView。

func changePreviewImage() {
    preview.image = grayness.image
    print ("THERE IS  \(grayness.image?.debugDescription ?? "NO") \(preview.image?.debugDescription ?? "NO IMAGE, BUT WHY???")")
    preview.needsDisplay = true
}

我有一个输出说grayness.image存在，但是分配后的preview.image总是nil。

THERE IS  <NSImage 0x600001797600 Name=NSAdvanced Size={32, 32} Reps=(
    "NSISIconImageRep 0x60000178e400 Size={32, 32} ColorSpace=Generic RGB colorspace BPS=0 Pixels=32x32 Alpha=NO AppearanceName=NSAppearanceNameAqua",
    "NSISIconImageRep 0x60000178c740 Size={32, 32} ColorSpace=Generic RGB colorspace BPS=0 Pixels=32x32 Alpha=NO AppearanceName=NSAppearanceNameDarkAqua",
    ..... (all representations of an image)
)> NO IMAGE, BUT WHY???

这是怎么回事？

Answer 1

问题在于NSImageView是作为一个简单的NSView创建的，并且稍后在IB Inspector中更改了类。当我删除旧的并重新创建时，NSImageView分配可以正常工作。

无法将NSImage分配给NSImageView

1 个答案: