GLPaint 示例：如何以编程方式创建视图？
我需要在图像上绘制一些内容，例如 GLPaint 示例，但我需要创建 EAGL 表面，以编程方式渲染 OpenGL。
示例中是在 MainWindow.xib 中实例化的
如果我尝试使用以下内容以编程方式创建视图：
self.drawingView = [[PaintingView alloc] initWithCoder:nil];
drawingView.frame = CGRectMake(0, 0, 320, 380);
[self.view addSubview:drawingView];
我收到此错误：
failed to make complete framebuffer object 8cd6
也许与 init 有关的内容？有什么提示吗？谢谢。
I need to draw something on an image, like in the GLPaint sample from Apple, but I need to create the EAGL surface where render the OpenGL programmatically.
In the sample is instatiated in the MainWindow.xib
If I try to create the view programmatically with something like:
self.drawingView = [[PaintingView alloc] initWithCoder:nil];
drawingView.frame = CGRectMake(0, 0, 320, 380);
[self.view addSubview:drawingView];
I got this error:
failed to make complete framebuffer object 8cd6
Maybe something related to the init? Any hints? Thanks.
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快速浏览一下源代码，Apple 已将 PaintingView 的所有重要初始化内容放在
initWithCoder:中，从第 77 行到第 168 行。这是 NSCoding 协议的一部分，用于存档和取消存档文件中的对象。如果您调用initWithCoder:nil，很可能 initWithCoder 的 UIView 实现无法获取它需要的一些相关值。据猜测，它的大小可能开始为零，这对于帧缓冲区对象来说不是有效的大小。我建议您将
initWithCoder:(NSCoder *)coder替换为initWithFrame:(CGRect)frame，在第 86 行的 super 上调用相同的方法。为了获得更好的实现，实现 initWithFrame: 和 initWithCoder:，让两者为if((self = [super initWithXXX:argument]))块中包含的所有内容调用公共部分。From a quick glance inside the source, Apple have put all of the significant initialisation stuff for PaintingView inside
initWithCoder:, from lines 77 to 168. That's part of the NSCoding protocol, which is used for archiving and unarchiving objects from files. If you callinitWithCoder:nil, quite probably the UIView implementation of initWithCoder isn't able to get some relevant value that it needs. At a guess, it probably starts being size zero, which isn't a valid size for a framebuffer object.I'd suggest you replace
initWithCoder:(NSCoder *)coderwithinitWithFrame:(CGRect)frame, calling the same on super at line 86. For an even better implementation, implement both initWithFrame: and initWithCoder:, having the two call a common section for everything enclosed in theif((self = [super initWithXXX:argument]))block.