NSWindow如何实现圆角

分两步走：

1.子类化NSWindow,主要是重载了下面这个函数

- (id)initWithContentRect:(NSRect)contentRect

                styleMask:(NSUInteger)aStyle

                  backing:(NSBackingStoreType)bufferingType

                    defer:(BOOL)flag {

    self = [super initWithContentRect:contentRect styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered defer:NO];

    if (self != nil) {

        [self setOpaque:NO];

        [self setBackgroundColor:[NSColor clearColor]];

    }

    return self;

}

2.子类化NSWindow的view,重载drawRect，其中的圆角半径和背景颜色自己可以调整

- (void)drawRect:(NSRect)dirtyRect

{

    [NSGraphicsContext saveGraphicsState];



    NSRect rect = [self bounds];

    NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:rect xRadius:5 yRadius:5];

    [path addClip];

    

    [[NSColor controlColor] set];

    NSRectFill(dirtyRect);

    

    [NSGraphicsContext restoreGraphicsState];

    

    [super drawRect:dirtyRect];

}

实现demo效果如下：