使用display和setNeedsDisplay刷新视图不起作用 [英] Refresh view with display and setNeedsDisplay not working

问题描述

我在仿真过程中无法更新我的customView对象.模拟完成后，将弹出窗口.我希望它在仿真过程中进行自我更新.为此，我使用了setNeedsDisplay:YES，我也尝试了display.但是，这些都不对我有用.有谁知道我应该如何工作?如您在下面看到的，我尝试创建一个用于更新以及使用NSOperations的新线程.感谢帮助！

I am having problems updating my customView object during simulation. The window pops up after the simulation is done. I would like it to update itself during the simulation. For this I use setNeedsDisplay:YES and I have also tried display. None of this works for me however. Does anyone have an idea how I should get this working? As you can see below I have tried to create a new thread for the updating as well as using NSOperations. Grateful for help!

//Run simulation
    for (int iteration=0; iteration<numberOfIterations; iteration++){
        //NSInvocationOperation *update = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(updatePopulation) object:nil];
        //NSInvocationOperation *draw = [[NSInvocationOperation alloc] initWithTarget:view selector:@selector(redraw) object:nil];
        //[draw addDependency:update];
        //[queue addOperation:update];
        //[queue addOperation:draw];
        [NSThread sleepForTimeInterval:0.01]; //to make it easer to see..
        [self updatePopulation];
        //[view redraw];
        [NSThread detachNewThreadSelector:@selector(redraw) toTarget:view withObject:nil];
        //[self performSelector:@selector(updatePopulation) withObject:nil afterDelay:1];
        //[view performSelector:@selector(redraw) withObject:nil afterDelay:1];
        //Save segregation
        if (iteration%(numberOfIterations/100) == 0) {
            printf("hej\n");
        }
    }

在我的查看器类中:

- (void) redraw {
    //[self setNeedsDisplay:YES];
    [self display];
}

推荐答案

您似乎正在尝试在辅助线程上绘画.

It looks like you are trying to do the painting on the worker thread.

据我所知，这不受支持.

This is not, as far as I am aware, supported.

要解决此问题，您需要将模拟移至工作线程，然后使用这篇关于可可线程化的文章，在尝试实现线程可可应用时必须阅读.

To solve this, you need to move your simulation to a worker thread, and then use performSelectorOnMainThread: to invoke the redraw on the main thread. I find this article on threading in cocoa to be required reading when trying to implemented threaded cocoa apps.

这篇关于使用display和setNeedsDisplay刷新视图不起作用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！