在NSView中重复背景图像 [英] Repeating background image in an NSView

问题描述

  // INIT $ 
我想在NSView中绘制重复的背景图片b $ b  - （id）initWithFrame：（NSRect）frame {
 if（self = [super initWithFrame：frame]）{
 self.backgroundImage = [NSImage imageNamed：@progressBackground.pdf]; 
} 
 
 return self; 
} 
 
 // DRAW 
  - （void）drawRect：（NSRect）dirtyRect {
 //绘制背景
 [backgroundImage drawInRect：[self bounds] 
 fromRect：NSMakeRect（0.0f，0.0f，backgroundImage.size.width，backgroundImage.size.height）
 operation：NSCompositeSourceAtop 
 fraction：1.0f]; 
 NSLog（@％dx％d，backgroundImage.size.width，backgroundImage.size.height）; 
} 
  

但是，视图延伸图像以填充自身。

（黑色笔画已经固定）

此外，奇怪的事情发生，因为控制台说图像的大小等于 -2109897792x0 ，但图片真的是 32x32 ！ WTF？！

有人可以帮我吗？感谢。

解决方案

您可以使用+[NSColor colorWithPatternImage：] ，然后只需填充与颜色的背景矩形。这应该做你想要完成的。

I am trying to draw a repeating background image in my NSView, I have this till now:

// INIT
- (id)initWithFrame:(NSRect)frame {
  if (self = [super initWithFrame:frame]) {
    self.backgroundImage = [NSImage imageNamed:@"progressBackground.pdf"];
  }

  return self;
}

// DRAW
- (void)drawRect:(NSRect)dirtyRect {
  // Draw the background
  [backgroundImage drawInRect:[self bounds]
                     fromRect:NSMakeRect(0.0f, 0.0f, backgroundImage.size.width, backgroundImage.size.height)
                    operation:NSCompositeSourceAtop
                     fraction:1.0f];
  NSLog(@"%dx%d", backgroundImage.size.width, backgroundImage.size.height);
}

However, the view stretches the image to fill itself. I want the image to repeat instead.

(the black strokes are fixed already)

Also, something strange happens, as the console says the size of the image equals -2109897792x0, but the image really is 32x32! WTF?!

Could someone help me, please? Thanks.

解决方案

You can create a pattern color with +[NSColor colorWithPatternImage:] and then just fill the background rectangle with that "color". That should do what you want to accomplish.

这篇关于在NSView中重复背景图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！