我想在drawRect UIView中放置一个横幅,但它在“bannerView.rootViewController = self”行发出警告。所以我将横幅放在它的 viewController 中。我希望绘制矩形中的值来更改横幅的位置。该值可以打印出来,但横幅拒绝移动。这是代码:
View Controller :
class ViewController: UIViewController, GADBannerViewDelegate,ChangeBannerDelegate
// var bannerView:GADBannerView! // shows nil when run func changeBanner(), has to use the following
var bannerView = GADBannerView(adSize: kGADAdSizeBanner)
override func viewDidLoad() {
super.viewDidLoad()
waveView = WaveWater(frame: self.view.bounds)
bannerView = GADBannerView(adSize: kGADAdSizeBanner)
bannerView.frame = CGRect(x: 0, y: self.view.bounds.height-50, width: self.view.bounds.width, height: 50)
bannerView.adUnitID = "xxxxxxxxxxxx"
bannerView.rootViewController = self
bannerView.delegate = self
self.view.addSubview(bannerView)
bannerView.loadRequest(GADRequest())
// set other things...
}
func changeBanner(y:CGFloat){
bannerView.frame.origin.y = y
println(bannerView.frame.origin.y) // can print 'y', and banner.frame.origin.y was changed, but banner stays where it is
}
界面 View :
protocol ChangeBannerDelegate:NSObjectProtocol,GADBannerViewDelegate{
func changeBanner(y:CGFloat)
}
class WaveWater: UIView, UIGestureRecognizerDelegate {
var bannerDelegate:ChangeBannerDelegate?
override init(frame: CGRect) {
super.init(frame: frame)
self.bannerDelegate = ViewController()
changeBanner(50) // place it here just for a try
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func drawRect(rect: CGRect) {
//drawing things........
}
}
最佳答案
您正在将 WaveWater
View 的 bannerDelegate
设置为 init(frame:)< 中的
方法:ViewController
的新实例
self.bannerDelegate = ViewController()
它应该设置为您已经拥有的 View Controller 的实例,最好的位置是在您在 viewDidLoad
中创建 View 之后:
override func viewDidLoad() {
super.viewDidLoad()
waveView = WaveWater(frame: self.view.bounds)
waveView.bannerDelegate = self
...
}
关于ios - UIView 中的协议(protocol)无法更改 viewController 中的对象?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32516549/