xcode 如何使用可可进度条？
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How to use cocoa progress bars?
提问by CocoaCoder
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.
我是一名全新的 Mac 程序员，我需要有关如何使用NSProgressIndicator. 我已经在寻找示例代码，但找不到任何有用的东西。
What I want to do is this:
我想做的是这样的：
-(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
}
回答by Aaron
I think performSelector:withObject:afterDelaywill help you here.
我想performSelector:withObject:afterDelay会在这里帮助你。
Write a method that will increment your progress bar. At the end of that method call performSelector:withObject:afterDelayon the same method with a delay of 1 second until the bar is full.
编写一个方法来增加你的进度条。在该方法结束时调用performSelector:withObject:afterDelay相同的方法，延迟 1 秒，直到条形图已满。
You probably won't need to pass an object to that method, so you can just use nil.
您可能不需要将对象传递给该方法，因此您可以使用 nil。
EDIT
编辑
In your case I would recommend something like this:
在你的情况下，我会推荐这样的东西：
- (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];
}
