如何使NSView的背景图片不重复？ [英] How to make NSView's background image not repeat?

问题描述

我想复制由以下CSS代码获得的效果：

I want replicate the effect obtained by the following CSS code:

background: white url(./img/background.png) no-repeat;

我写了一个NSView的子类，并覆盖 drawRect 这样：

I've written a subclass of NSView and override drawRect in this way:

- (void)drawRect:(NSRect)dirtyRect
{
    dirtyRect = [self bounds];

    [[NSColor whiteColor] setFill];
    NSRectFill(dirtyRect);

    [[NSColor colorWithPatternImage:[NSImage imageNamed:@"background.png"]] setFill];
    NSRectFill(dirtyRect);
}

（抱歉我的英文不好意思）

(I apologize for my bad english)

推荐答案

查看 NSImage 类引用。图片可以使用 drawInRect：fromRect：operation：fraction：以及 drawAtPoint： fromRect：operation：fraction：。

Take a look at NSImage class reference. Image can be drawn with drawInRect:fromRect:operation:fraction: and also with drawAtPoint:fromRect:operation:fraction:.

因此，您可以使用：

[[NSImage imageNamed:@"background.png"] drawInRect:dirtyRect fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1]; // Passing NSZeroRect causes the entire image to draw. 

而是：

[[NSColor colorWithPatternImage:[NSImage imageNamed:@"background.png"]] setFill];
    NSRectFill(dirtyRect);

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