强制以编程方式重新绘制NSView [英] Force NSView to redraw programmatically

问题描述

我的应用程序有两个不同的状态，每个状态都将用一个NSView表示.

My app has two different states, and every state will be representing with a NSView.

所以一次只显示一个视图，问题是当我在视图之间切换时，在我手动调整窗口大小之前，应用程序不会显示新状态！

so there is only one view showed at a time, the problem is when I switched between the views the app doesn't show the new state until I resize the window manually!

我搜索了这个问题，并提出了多个解决方案，但没有任何解决方法:

I searched about this problem and come with more than one solution but nothing worked with me:

[myView setNeedsDisplay:YES];
[myView display];
[[myView.window contentView] setNeedsDisplay:YES];


[mySubView1 setHidden:YES]; || [mySubView1 removeFromSuperView];

我什至将myView定义为Outlet，并且没有任何作用.

I even defined myView as Outlet, and nothing work.

这是我的代码

if (appState == 1) {

    [self.splitView setFrameSize:CGSizeMake(self.splitView.frame.size.width, self.view.frame.size.height - 250)];

    [self.mySubView1 setHidden:NO];
    [self.mySubView2 setHidden:YES];

    [self.mySubView2 removeFromSuperview];
    [self.mySubView1 addSubview:self.inCallView];
}
else
{
    [self.splitView setFrameSize:CGSizeMake(self.splitView.frame.size.width, self.view.frame.size.height - 70)];

    [self.mySubView1 setHidden:YES];
    [self.mySubView2 setHidden:NO];

    [self.mySubView1 removeFromSuperview];
    [self.mySubView2 addSubview:self.chatHeaderView];
}
// I need to redraw here
[self.view setNeedsDisplay:YES];
[self.mySubView1 setNeedsDisplay:YES];
[self.mySubView2 setNeedsDisplay:YES];
// and nothing happened until I resize my window manually 

推荐答案

我发现了，代码很好，不需要调用任何重绘方法，唯一的问题任何UI操作都需要在主线程

I found it, the code is just fine and no need to call any redraw method, the only problem Any UI action need to be done in the MAIN thread

因此最终代码将是:

dispatch_async( dispatch_get_main_queue(), ^{
    if (appState == 1) {
        [self.splitView setFrameSize:CGSizeMake(self.splitView.frame.size.width, self.view.frame.size.height - 250)];

        [self.mySubView1 setHidden:NO];
        [self.mySubView2 setHidden:YES];
    }
    else
    {
        [self.splitView setFrameSize:CGSizeMake(self.splitView.frame.size.width, self.view.frame.size.height - 70)];

        [self.mySubView1 setHidden:YES];
        [self.mySubView2 setHidden:NO];
    }
});

谢谢，伙计们.

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