设置自定义视图的背景与黑色背景的图像效果 [英] Setting the background of a custom view with an image results in a black background

问题描述

我有一个问题我的设置子类的NSView的背景名为 TitlebarView 。我想通过 colorWithPattternImage 使用图片作为背景，但结果却是一个黑色的背景不是我给的方法作为参数的形象。

I have a problem setting the background of my subclassed NSView called TitlebarView. I want to use an image as a background via colorWithPattternImage, but the result is a black background not the image i gave the method as a parameter.

下面是我的code TitlebarView ：

Here's my code of TitlebarView:

- (id)initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        NSString* pathToTitlebarBGImage = [[NSBundle mainBundle] pathForResource:@"titlebar_bg" ofType:@"png" inDirectory:@"Resources/gui_images"];
        NSLog(@"path to titlebar bg image: %@", pathToTitlebarBGImage);
        //    NSString* pathToTitlebarBGImage = @"Resources/gui_images/titlebar_bg.png";
        self.titlebarBGImage = [NSImage imageNamed:pathToTitlebarBGImage];
    }
    return self;
}

- (void)drawRect:(NSRect)dirtyRect
{
    [super drawRect:dirtyRect];
    [[NSColor colorWithPatternImage:self.titlebarBGImage] setFill];
//    [[NSColor redColor] setFill];
    NSRectFill(dirtyRect);
}

titlebarBGImage 是头文件的正确设置属性。结果
如果我用 redColor 行我得到的红色视图，因此code是工作在一定程度上。对于所有我能找到的文档的计算器上按预期这应该实际工作。缺少什么我在这里？

titlebarBGImage is a properly set property in the header files.
If I use the line with redColor I get the red colored view, so the code is working to some degree. For all I could find in the documentation an on stackoverflow this should actually work as intended. What am I missing here?

这是孤立我的整体问题的发现问题这里

This is isolated problem of my overall question found here

推荐答案

imageNamed：需要一个文件名，而不是路径名，并搜索的文件名束。如果你想从路径中使用 initWithContentsOfFile加载图像：。请参阅<一个href=\"https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSImage_Class/Reference/Reference.html\"相对=nofollow> NSImage中文档。

imageNamed: takes a file name, not a path name, and searches for the file name in the bundle. If you wish to load an image from a path use initWithContentsOfFile:. See the NSImage documentation.

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