您可以使用通知从管道异步读取。这是一个演示其工作原理的简单示例，希望可以帮助您入门：
let task = NSTask()
task.launchPath = "/bin/sh"
task.arguments = ["-c", "echo 1 ; sleep 1 ; echo 2 ; sleep 1 ; echo 3 ; sleep 1 ; echo 4"]
let pipe = NSPipe()
task.standardOutput = pipe
let outHandle = pipe.fileHandleForReading
outHandle.waitForDataInBackgroundAndNotify()
var obs1 : NSObjectProtocol!
obs1 = NSNotificationCenter.defaultCenter().addObserverForName(NSFileHandleDataAvailableNotification,
object: outHandle, queue: nil) { notification -> Void in
let data = outHandle.availableData
if data.length > 0 {
if let str = NSString(data: data, encoding: NSUTF8StringEncoding) {
print("got output: \(str)")
}
outHandle.waitForDataInBackgroundAndNotify()
} else {
print("EOF on stdout from process")
NSNotificationCenter.defaultCenter().removeObserver(obs1)
}
}
var obs2 : NSObjectProtocol!
obs2 = NSNotificationCenter.defaultCenter().addObserverForName(NSTaskDidTerminateNotification,
object: task, queue: nil) { notification -> Void in
print("terminated")
NSNotificationCenter.defaultCenter().removeObserver(obs2)
}
task.launch()
而是print("got output: \(str)")可以将接收到的字符串附加到文本视图中。
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