在Swift中同时用代理和Block(Closure)回调

目的：

A页面push到B页面，点击B页面的按钮传值到A页面，分别用delegate和Block来实现 

1.在页面B定义delegate和Block

```

importUIKit

@objcprotocolDetailedViewControllerDelegate {

@objcoptionalfuncchangeValue (value:Int) ->Void;

}

classDetailedViewController:UIViewController{

var_title:String?

vardelegate:DetailedViewControllerDelegate?

varcount:Int=0

varchangeBlock:((Int) -> ())?

overridefuncviewDidLoad() {

super.viewDidLoad()

navigationItem.title=_title

self.view.backgroundColor=UIColor.brown

weakvarweakSelf =self

letbtn =CGButton.shendInstance().createButton(frame:CGRect(), bgColor:UIColor.red, title:"按钮", superView:self.view) { (action)in

weakSelf?.count+=1

letcout = weakSelf?.count

// Block回调

if(weakSelf?.changeBlock! !=nil) {

weakSelf?.changeBlock!(cout!)

}

// 代理回调

if((weakSelf?.delegate?.changeValue) !=nil) {

weakSelf?.delegate?.changeValue!(value: cout!)

}

}

btn.snp.makeConstraints{ (make)in

make.top.equalTo(0)

make.left.equalTo(100)

make.width.height.equalTo(100)

}

}

funcchangeValue(value:@escaping(Int) -> ()) ->Void{

self.changeBlock= value

}

}

```

2.在push的时候

```

moiveView.clickdidSelectItemAt{ (collection, indexPath)in

letdataModel =self._movieView.dataSource[indexPath.item]as!MovieModel

letDetailedVC =DetailedViewController()

DetailedVC.delegate=self

//Block的回调

DetailedVC.changeValue(value: { (value)in

print("blockChange\(value)")

})

DetailedVC._title= dataModel.titleasString

self.navigationController!.pushViewController(DetailedVC, animated:true)

}

// delegate的回调

funcchangeValue(value:Int) {

print("delegateChange\(value)")

}

```