如何使用可可进度条?

问题描述

我是一名全新的 Mac 程序员，我需要有关如何使用 NSProgressIndicator 的帮助.我已经在寻找示例代码，但找不到任何有用的东西.

I am a brand new Mac programmer and I need help on how to use NSProgressIndicator. I already looked for sample code, but couldn't find anything that helped.

我想做的是:

-(IBAction)startProgressBar:(id)sender; {

    //I want to make the bar update itself by the  value of 1 until it is at the value of 100
    //Example: add 1 to bar every second until it is full

}

推荐答案

我认为 performSelector:withObject:afterDelay 会在这里帮助你.

I think performSelector:withObject:afterDelay will help you here.

编写一个方法来增加你的进度条.在该方法结束时，在同一方法上调用 performSelector:withObject:afterDelay，延迟 1 秒，直到栏已满.

Write a method that will increment your progress bar. At the end of that method call performSelector:withObject:afterDelay on the same method with a delay of 1 second until the bar is full.

您可能不需要将对象传递给该方法，因此您可以使用 nil.

You probably won't need to pass an object to that method, so you can just use nil.

编辑

在你的情况下，我会推荐这样的东西:

In your case I would recommend something like this:

- (IBAction)startProgressBar:(id)sender
{
    // Initialize the progress bar to go from 0 to 100
    [progress setMinValue:0.0];
    [progress setMaxValue:100.0];
    [progress setDoubleValue:0.0];

    // Start the auto-increment calls
    [self incrementProgressBar];
}

- (void)incrementProgressBar
{
    // Increment the progress bar value by 1
    [progress incrementBy:1.0];

    // If the progress bar hasn't reached 100 yet, then wait a second and call again
    if([progress doubleValue] < 100.0)
        [self performSelector:@selector(incrementProgressBar) withObject:nil afterDelay:1];
}

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