Swift

Question

我不想在每个UIViewController swift文件中使用相同的代码，所以我创建了一个自定义函数：

import Foundation;
import UIKit;

func noSignal(view : UIView) -> UIView {

    let noConnectionView = UIView(frame: CGRectMake(100, 200, 260, 200));
    noConnectionView.backgroundColor = UIColor.whiteColor();
    noConnectionView.layer.cornerRadius = 10;
    noConnectionView.layer.shadowColor = UIColor.blackColor().CGColor;
    noConnectionView.layer.shadowRadius = 8;
    noConnectionView.layer.shadowOpacity = 0.3;
    noConnectionView.layer.shadowOffset = CGSizeMake(0, 0);
    noConnectionView.center = view.center;

    let heading = UILabel(frame: CGRectMake(10,40,240,20));
    heading.textColor = UIColor.lightGrayColor();
    heading.textAlignment = NSTextAlignment.Center;
    heading.text = "NO CONNECTION";
    noConnectionView.addSubview(heading);

    let message = UITextView(frame: CGRectMake(10,80,240,60));
    message.textColor = UIColor.lightGrayColor();
    message.textAlignment = NSTextAlignment.Left;
    message.text = "Please enable internet connection in your device (WiFi or Mobile) and tap retry.";
    noConnectionView.addSubview(message);

    let retry = UIButton(frame: CGRectMake(60,140,140,40));
    retry.setTitle("Retry", forState: UIControlState.Normal);
    retry.layer.cornerRadius = 6;
    retry.backgroundColor = UIColor(netHex: 0xF91A6E);
    retry.setTitleColor(UIColor.whiteColor(), forState: .Normal);
    retry.addTarget(self, action: "retryConnection:", forControlEvents: UIControlEvents.TouchUpInside);

    noConnectionView.addSubview(retry);
    view.addSubview(noConnectionView);


    return noConnectionView;

}

在所有示例中，我看到addTarget应该引用self，但是当我这样做时，Xcode显示使用uf未解析的标识符＆＃39; self＆＃39;所以我试图使用view然后它编译。但当我点击重试按钮时，它会崩溃。

所以我的问题是，我应该在哪里放置＆＃34; retryConnection＆＃34;功能，应该在noSignal函数内，还是在其他地方？此功能在UIWebView webViewDidStartLoad中运行。

Answer 1

请尝试使用您要添加该视图的pass passcontroller并将目标更改为该viewcontroller而不是self

    func noSignal(view : UIView , viewController : UIViewController) -> UIView {

    let noConnectionView = UIView(frame: CGRectMake(100, 200, 260, 200));
    noConnectionView.backgroundColor = UIColor.whiteColor();
    noConnectionView.layer.cornerRadius = 10;
    noConnectionView.layer.shadowColor = UIColor.blackColor().CGColor;
    noConnectionView.layer.shadowRadius = 8;
    noConnectionView.layer.shadowOpacity = 0.3;
    noConnectionView.layer.shadowOffset = CGSizeMake(0, 0);
    noConnectionView.center = view.center;

    let heading = UILabel(frame: CGRectMake(10,40,240,20));
    heading.textColor = UIColor.lightGrayColor();
    heading.textAlignment = NSTextAlignment.Center;
    heading.text = "NO CONNECTION";
    noConnectionView.addSubview(heading);

    let message = UITextView(frame: CGRectMake(10,80,240,60));
    message.textColor = UIColor.lightGrayColor();
    message.textAlignment = NSTextAlignment.Left;
    message.text = "Please enable internet connection in your device (WiFi or Mobile) and tap retry.";
    noConnectionView.addSubview(message);

    let retry = UIButton(frame: CGRectMake(60,140,140,40));
    retry.setTitle("Retry", forState: UIControlState.Normal);
    retry.layer.cornerRadius = 6;
 //   retry.backgroundColor = UIColor(netHex: 0xF91A6E);
    retry.setTitleColor(UIColor.whiteColor(), forState: .Normal);
    retry.addTarget(viewController, action: "retryConnection:", forControlEvents: UIControlEvents.TouchUpInside);

    noConnectionView.addSubview(retry);
    view.addSubview(noConnectionView);


    return noConnectionView;

}