小编tsa*_*iid的帖子

我的Xcode版本:6.3.2
Alamofire版本:1.2.2(通过Cocoapods安装)

为了设置maxConcurrentOperationCount限制a中的并发操作数NSOperationQueue,我将我的Alamofire下载请求包含在NSOperation中,就像Rob建议的那样.

NSOperation像这样的基本子类:

class ConcurrentOperation : NSOperation {

    override var concurrent: Bool {
        return true
    }

    override var asynchronous: Bool {
        return true
    }

    private var _executing: Bool = false
    override var executing: Bool {
        get {
            return _executing
        }
        set {
            if (_executing != newValue) {
                self.willChangeValueForKey("isExecuting")
                _executing = newValue
                self.didChangeValueForKey("isExecuting")
            }
        }
    }

    private var _finished: Bool = false;
    override var finished: Bool {
        get {
            return _finished …