Core Animation Programming Guide让我相信,默认情况下,子层可以扩展到主机视图的边界之外而不会被剪切。但这不是我发生的事情。
以下是我初始化图层托管自定义视图的方法:
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self != nil) {
mBaseImage = [[NSImage imageNamed: @"Button.png"] retain];
mSliderImage = [[NSImage imageNamed: @"Track.png"] retain];
mRootLayer = [CALayer layer];
mRootLayer.masksToBounds = NO;
[self setLayer: mRootLayer ];
[self setWantsLayer: YES];
mRootLayer.contents = mBaseImage;
mSliderLayer = [CALayer layer];
[mRootLayer addSublayer: mSliderLayer];
NSSize imSize = [mSliderImage size];
NSRect sliderBounds = NSMakeRect( 0.0f, 0.0f, imSize.width, imSize.height );
mSliderLayer.bounds = sliderBounds;
mSliderLayer.contents = mSliderImage;
mSliderLayer.position = NSMakePoint( 31.0f, 31.0f );
}
return self;
}
主机视图和用作其内容的图像为62x62,而子图层图像为90x10。但整个事情被限制在62x62的范围内。我错过了什么?
答案 0 :(得分:5)
诀窍似乎是视图必须包含在具有图层的另一个视图(可能是窗口的内容视图)中。 (有记录吗?)