如何为CALayer设置平铺背景图像？

Question

当我为IKBrowserView设置背景时，根据视图大小调整背景大小：是否有将它设置为平铺图像的方法，重复但未调整大小？

NSImage* backgroundImage = [NSImage imageNamed:@"wood-bg2.jpg"]; 
CALayer* aLayer = [CALayer layer]; 
//aLayer.contents = backgroundImage; 

CIColor *ci = [[CIColor alloc] initWithColor:[NSColor colorWithPatternImage:backgroundImage]]; 
CGColorSpaceRef cs = [ci colorSpace]; 
const CGFloat *comps = [ci components]; 
CGColorRef cgColor = CGColorCreate(cs, comps); 

aLayer.backgroundColor = cgColor; 
[itemThumbnailImageBrowserView setBackgroundLayer:aLayer]; 

我试过了注释掉的代码和当前的代码，但都没有工作。 感谢

Answer 1

还有的NSColor方法：

+ (NSColor *)colorWithPatternImage:(NSImage *)image 

所以，你可以做这样的事情：

NSImage* backgroundImage = [NSImage imageNamed:@"wood-bg2.jpg"]; 
CALayer* aLayer = [CALayer layer]; 
aLayer.backgroundColor = [[NSColor colorWithPatternImage:backgroundImage] CGColor]; // - (CGColor) CGColor; is only available in OS X 10.8 and later 
[itemThumbnailImageBrowserView setBackgroundLayer:aLayer]; 

---

更新OS X 10.8和更低

转换NSColor至CGColor（未测试）：

CIColor *ci = [[CIColor alloc] initWithColor:[NSColor colorWithPatternImage:backgroundImage]]; 
CGColorSpaceRef cs = [ci colorSpace]; 
const CGFloat *comps = [ci components]; 
CGColorRef cgColor = CGColorCreate(cs, comps);