我试图将数据从模态ViewController传递到他的源ViewController.我想我必须使用授权,但不行.
protocol communicationControllerCamera{
func backFromCamera()
}
class Camera: UIViewController{
var delegate: communicationControllerCamera
init(){
self.delegate.backFromCamera()
}
}
class SceneBuilder: UIViewController,communicationControllerCamera{
func backFromCamera(){ // Never called
println("YEAHH")
}
}
解决方法
你没有设置一个代理,所以当你尝试回调FromCamera()时它是空的.
这是一个简单的工作示例,您可以测试.请注意使用可选类型(？)作为委托.
// Camera class
protocol communicationControllerCamera {
func backFromCamera()
}
class Camera: UIViewController {
var delegate: communicationControllerCamera? = nil
override func viewDidLoad() {
super.viewDidLoad()
self.delegate?.backFromCamera()
}
}
// SceneBuilder class
class SceneBuilder: UIViewController,communicationControllerCamera {
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
var myCamera = Camera()
myCamera.delegate = self
self.presentModalViewController(myCamera,animated: true)
}
func backFromCamera() {
println("Back from camera")
}
}
您可以在Apple’s Swift documentation找到所需的所有信息.
