你好，这是我在CATiledlayer中绘制pdf的代码-(void)drawLayer:(CALayer*)layerinContext:(CGContextRef)ctx{CGContextSetRGBFillColor(ctx,1.0,1.0,1.0,1.0);CGContextFillRect(ctx,CGContextGetClipBoundingBox(ctx));CGContextTranslateCTM(ctx,0.0,layer.bounds.size.height);CGContextScaleCTM(ctx,1.0,-1.0);CGContextConcatCTM