iOS：在 EAGLView / GLKView 之上创建覆盖层

发布于 2024-12-27 17:16:35 字数 1135 浏览 1 评论 0原文

我正在尝试在 GLKView （实际上是 EAGLView）之上创建一个覆盖层。我知道性能影响，但在我的情况下这不是问题，因为场景在后台暂停，它只需要保持可见即可。

我创建了一个名为 ReaderView 的自定义 UIView，其唯一的自定义代码如下：

-(CALayer*)layer {
CATextLayer *textLayer = [[CATextLayer alloc] init];

// Layer settings.
[textLayer setCornerRadius:5.0f];

// Text settings.
[textLayer setFont:CGFontCreateWithFontName((CFStringRef)READING_FONT)];
[textLayer setFontSize:READING_FONT_SIZE];
[textLayer setAlignmentMode:kCAAlignmentJustified];
[textLayer setWrapped:YES];

return textLayer;
}

然后我在 GLKViewController 中调用了以下内容：

-(void)onMyCustomEvent {
if (_readerView==nil) {
    CGRect frame = [[self view] frame];
    frame.size.width *= 0.8f;
    frame.size.height *= 0.8f;
    _readerView=[[ReaderView alloc] initWithFrame:frame];
    [_readerView setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];
}
[_readerView setText:[node content]];
[[self view] addSubview:_readerView];
}

NSLog已经证明这个方法被调用并且阅读器视图被初始化。但是 GLKView 顶部没有显示任何内容。

知道为什么这不起作用吗？

原文

I'm trying to create an overlay on top of a GLKView (effectively an EAGLView). I'm aware of the performance impact, but in my situation that's not a problem, since the scene is paused in the background, it merely needs to remain visible.

I've created a custom UIView called ReaderView whose only custom code is the following:

-(CALayer*)layer {
CATextLayer *textLayer = [[CATextLayer alloc] init];

// Layer settings.
[textLayer setCornerRadius:5.0f];

// Text settings.
[textLayer setFont:CGFontCreateWithFontName((CFStringRef)READING_FONT)];
[textLayer setFontSize:READING_FONT_SIZE];
[textLayer setAlignmentMode:kCAAlignmentJustified];
[textLayer setWrapped:YES];

return textLayer;
}

I've then called the following in a GLKViewController:

-(void)onMyCustomEvent {
if (_readerView==nil) {
    CGRect frame = [[self view] frame];
    frame.size.width *= 0.8f;
    frame.size.height *= 0.8f;
    _readerView=[[ReaderView alloc] initWithFrame:frame];
    [_readerView setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];
}
[_readerView setText:[node content]];
[[self view] addSubview:_readerView];
}

NSLog has proven this method gets called and the reader view gets initialized. However nothing displays on top of the GLKView.

Any idea why this doesn't work?

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南冥有猫 2025-01-03 17:16:35

由于您将其添加为子视图，因此您应该使用bounds属性而不是父视图中的frame属性，如下所示：

CGRect frame = self.view.bounds;

如果这不能解决问题，请尝试将_readerView的背景颜色设置为值得注意的颜色以确保问题不在于缺少内容，如下所示：

_readerView.backgroundColor = [UIColor redColor];

最后，如果这些都不能解决问题，那么可能直接向 EAGL 视图添加子视图就是问题所在。在这种情况下，请创建一个容器视图并向其中添加 EAGL 视图和 _readerView。

Since you're adding it as a subview, you should use the bounds property instead of the frame property from the parent view, like this:

CGRect frame = self.view.bounds;

If that doesn't fix it, try setting the background color of the _readerView to something noticable to ensure that the problem isn't the content missing, like this:

_readerView.backgroundColor = [UIColor redColor];

Finally, if none of that solves it, then maybe directly adding subviews to an EAGL view is the problem. In that case, create a container view and add your EAGL view and your _readerView to that instead.

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