CALayer的shadowPath中的错误？

Question

我正在尝试使用以下方法绘制自定义形状的阴影CALayer:

#import <QuartzCore/QuartzCore.h>

@implementation ZKSBAppDelegate

@synthesize window = _window;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    NSView *view = self.window.contentView;
    view.wantsLayer = YES;

    CALayer *shadowLayer = [CALayer layer];
    shadowLayer.shadowOpacity = 1;
    shadowLayer.shadowRadius = 1;
    shadowLayer.shadowOffset = NSMakeSize(0, 0);

    CGMutablePathRef shadowPath = CGPathCreateMutable();
    // setting the following rect's width to 100 fixes everything.
    // setting it to 130 screws the shadow even more.
    CGPathAddRect(shadowPath, NULL, CGRectMake(4, 0, 120, 48));
    CGPathAddRect(shadowPath, NULL, CGRectMake(120, 50, 116, 48));
    shadowLayer.shadowPath = shadowPath;
    CGPathRelease(shadowPath);

    [view.layer addSublayer:shadowLayer];
}
@end

您可以在Xcode中创建一个空Cocoa项目,用上面的代码替换您的app.delegate的.m文件内容并自己尝试.

它看起来像特定的阴影路径几何导致CALayer疯狂.

例如:

CGPathAddRect(shadowPath, NULL, CGRectMake(4, 0, 100, 48));
CGPathAddRect(shadowPath, NULL, CGRectMake(120, 50, 116, 48));

这个看起来完全没问题:

现在我要将第一个矩形扩大20点:

CGPathAddRect(shadowPath, NULL, CGRectMake(4, 0, 120, 48));
CGPathAddRect(shadowPath, NULL, CGRectMake(120, 50, 116, 48));

......看起来不那么好了.加10分:

CGPathAddRect(shadowPath, NULL, CGRectMake(4, 0, 130, 48));
CGPathAddRect(shadowPath, NULL, CGRectMake(120, 50, 116, 48));

现在这是完全错误的,不是吗？

所以,问题是:到底发生了什么,我做错了什么？你认为这是一个错误,我应该提交报告吗？

Answer 1

是的，这听起来像是一个错误。即使不是，通过提交错误报告，Apple 也应该做出回应并为您提供有用的信息。