cocoa - 窗口顶部的 iTunes 或 Xcode 风格信息框

Question

我可以选择哪些选项来在 Cocoa 中重新创建 iTunes 顶部的框，或者像 Apple 在 XCode 4 中使用的那样？

这只是一个普通的图像，控件位于顶部吗？或者它是一个带有一些自定义样式魔法的 NSBox ？

Answer 1

我必须为我的一个项目编写类似的代码。对于我的解决方案，您将需要此 tutorial 中的示例代码中提供的两个类别。 。此代码将绘制背景渐变和必要的阴影，您可以在控件内添加其他内容。目前，代码将绘制 Xcode 样式渐变作为背景，但您可以将其注释掉，并取消注释 iTunes 样式(如果您需要的话)。希望这会有所帮助。

#import "NSShadow+MCAdditions.h" // from the tutorial linked to above
#import "NSBezierPath+MCAdditions.h" // from the same tutorial

- (void)drawRect:(NSRect)dirtyRect {
    static NSShadow *kDropShadow = nil;
    static NSShadow *kInnerShadow = nil;
    static NSGradient *kBackgroundGradient = nil;
    static NSColor *kBorderColor = nil;

    if (kDropShadow == nil) {
        kDropShadow = [[NSShadow alloc] initWithColor:[NSColor colorWithCalibratedWhite:.863 alpha:.75] offset:NSMakeSize(0, -1.0) blurRadius:1.0];
        kInnerShadow = [[NSShadow alloc] initWithColor:[NSColor colorWithCalibratedWhite:0.0 alpha:.52] offset:NSMakeSize(0.0, -1.0) blurRadius:4.0];
        kBorderColor = [[NSColor colorWithCalibratedWhite:0.569 alpha:1.0] retain];
        // iTunes style
        /*
         kBackgroundGradient = [[NSGradient alloc] initWithColorsAndLocations:[NSColor colorWithCalibratedRed:0.929 green:0.945 blue:0.882 alpha:1.0],0.0,[NSColor colorWithCalibratedRed:0.902 green:0.922 blue:0.835 alpha:1.0],0.5,[NSColor colorWithCalibratedRed:0.871 green:0.894 blue:0.78 alpha:1.0],0.5,[NSColor colorWithCalibratedRed:0.949 green:0.961 blue:0.878 alpha:1.0],1.0, nil];
         */
        // Xcode style
        kBackgroundGradient = [[NSGradient alloc] initWithColorsAndLocations:[NSColor colorWithCalibratedRed:0.957 green:0.976 blue:1.0 alpha:1.0],0.0,[NSColor colorWithCalibratedRed:0.871 green:0.894 blue:0.918 alpha:1.0],0.5,[NSColor colorWithCalibratedRed:0.831 green:0.851 blue:0.867 alpha:1.0],0.5,[NSColor colorWithCalibratedRed:0.82 green:0.847 blue:0.89 alpha:1.0],1.0, nil];
    }

    NSRect bounds = [self bounds];
    bounds.size.height -= 1.0;
    bounds.origin.y += 1.0;

    NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:bounds xRadius:3.5 yRadius:3.5];

    [NSGraphicsContext saveGraphicsState];
    [kDropShadow set];
    [path fill];
    [NSGraphicsContext restoreGraphicsState];

    [kBackgroundGradient drawInBezierPath:path angle:-90.0];

    [kBorderColor setStroke];
    [path strokeInside];

    [path fillWithInnerShadow:kInnerShadow];
}