NSTextField 等到循环结束才更新 [英] NSTextField waits until the end of a loop to update

问题描述

问题来了:我有一些代码是这样的

Here's the problem: I have some code that goes like this

otherWinController = [[NotificationWindowController alloc] init];
for (int i = 0; i < 10; i++) {
    [otherWinController showMessage:[NSString stringWithFormat:@"%d", i]];
    NSLog(@"%d", i);
    sleep(1);
}

其中 otherWinController 是 NSWindowController 的子类，我用来在代码发生更改时更新我的​​窗口，alloc init 方法只是打开笔尖并显示窗口.showMessage 是一种更改 NSTextView 以显示参数中的任何文本的方法.

where otherWinController is a subclass of NSWindowController that I am using to update my window as changes happen in code, and the alloc init method simply opens up the nib and shows the window. showMessage is a method that changes an NSTextView to display whatever text is in the parameter.

在 NSLog 中，文本每秒都在变化，并且只计数到十.但是对于 showMessage 方法，文本是空白的整整十秒钟，然后只显示数字 10.有什么想法吗??

in the NSLog, the text changes every second and just counts to ten. However for the showMessage method, the text is blank for a full ten seconds and then just displays the number 10. any thoughts??

FTR，showMessage 方法很简单

FTR, the showMessage method is simply

- (void)showMessage:(NSString *)text {
[[self message] setStringValue:text];
}

这并不重要，这很基本.

not that it should matter, that's pretty basic.

推荐答案

如果你明确地给 run loop 一些运行时间，你可能就可以在你的循环中达到预期的效果:

You can probably achieve the desired effect right inside your loop, if you explicitly give the run loop some time to run:

[[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow: 0.1]];

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