GLKViewControllerDelegate被阻止

问题描述

我有一个GLKViewController来处理一些OpenGL绘图.我同时实现了glkView:drawInRect和update方法，并且将preferredFramesPerSecond属性设置为30(默认值).

I have a GLKViewController to handle some OpenGL drawing. I have the glkView:drawInRect and update method both implemented and have the preferredFramesPerSecond property set to 30 (the default).

问题在于，当用户与应用程序的其他部分进行交互时，委托方法将停止触发.我看到的两种情况是用户滚动UITableView或与MKMapView进行交互.

The problem is that the delegate methods stop firing when the user interacts with other part of the app. The two cases that I have seen this happen on is when the user scrolls a UITableView or interacts with a MKMapView.

有没有一种方法可以确保这些委托总是 触发，而不管应用程序其余部分在做什么.我唯一希望这些停止的时间是当应用程序进入后台时(这是自动完成的).

Is there a way to make sure these delegates always fire, regardless of what the rest of the app is doing. The only time I want these to stop is when the app enters the background (which is does automatically).

推荐答案

原因是在表视图或地图视图中滚动时，运行循环位于UITrackingRunLoopMode中，其优先级高于默认模式.这样可以防止触发某些事件以确保较高的滚动性能.

The reason for this is that during scrolling in a table view or map view the runloop is in UITrackingRunLoopMode which has a higher priority than the default mode. This prevents some events from firing in order to guarantee a high scrolling performance.

要解决您的问题，您必须设置自己的渲染循环，而不要依赖GLKViewController.

To solve your problem you must set up your own rendering loop instead of relying on the GLKViewController.

• 首先将GLKView中的enableSetNeedsDisplay设置为NO(使用GLKViewController时应自动设置).
• 将preferredFramesPerSecond设置为0(或可能为1)以禁用GLKViewController的呈现循环或完全不使用GLKViewController
• 导入QuartzCore框架:#import <QuartzCore/QuartzCore.h>
• 创建一个CADisplayLink并将其安排在NSRunLoopCommonModes中:

• First set enableSetNeedsDisplay of the GLKView to NO (should be set automatically when using GLKViewController).
• set preferredFramesPerSecond to 0 (or maybe 1) to disable the rendering loop of GLKViewController or don't use GLKViewController at all
• Import the QuartzCore framework: #import <QuartzCore/QuartzCore.h>
• create a CADisplayLink and schedule it in NSRunLoopCommonModes:

CADisplayLink* displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(render:)];
[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];

• 可选:将displayLink的frameInterval设置为2(=帧速率的一半)
• render方法:

- (void)render:(CADisplayLink*)displayLink {
    GLKView* view = (GLKView*)self.view;
    [view display];
}

我还没有测试过，所以告诉我是否可行！

I haven't tested this, so tell me if it works!

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