IOS学习之UIWebView（3）

阳光穿透心脏的1/2处 2022-07-29 09:11 154阅读 0赞

## 1、语言：swift2 ##

## 2、浏览器简单示例 ##

控件如下：

![Center][]

## 3、ViewController继承 ##

viewController需要继承UIWebViewDelegate, UITextFieldDelegate

![Center 1][]

## 4、实现了协议 ##

实现了UIWebViewDelegate和UITextFieldDelegate中的部分协议。

## 5、源码如下： ##

import UIKit
    
    class ViewController: UIViewController,UIWebViewDelegate, UITextFieldDelegate{
    
        @IBOutlet weak var webView: UIWebView!
        @IBOutlet weak var searchBtn: UIButton!
        @IBOutlet weak var urlText: UITextField!
        
        /// 指示器
        var loadIndicator : UIActivityIndicatorView!;
        
        override func viewDidLoad()
        {
            super.viewDidLoad();
            
            
            /// 设置委托
            webView.delegate = self;
            
            /// 指示器对象
            loadIndicator = UIActivityIndicatorView(frame: CGRectMake(100.0, 100.0, 32.0, 32.0));
           
            loadIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray;
            
            view.addSubview(loadIndicator);
            
            urlText.delegate = self;
        }
    
        /// 文本框的协议：当点击输入框键盘上的go 按钮后，调用该协议
        func textFieldShouldReturn(textField:UITextField)->Bool
        {
            /// 触发键盘隐藏事件
            urlText.resignFirstResponder();
            let url = urlText.text;
        
            loadUrl(url!);
            
            return true;
        }
        
        /// 前往网址
        func loadUrl(url:String)
        {
            let urlObj = NSURL(string: url);
            
            let request = NSURLRequest(URL:urlObj!);
            
            webView.loadRequest(request);
        }
        
        
        /// 搜索按钮被点击事件
        @IBAction func searchBtnclicked(sender: AnyObject)
        {
            /// 收起键盘
            urlText.resignFirstResponder();
            let url = urlText.text;
            loadUrl(url!);
        }
        
        /// UIWebView协议实现
        func webViewDidStartLoad(webView: UIWebView) {
            /// 设置加载动画
            loadIndicator.startAnimating();
        }
        func webViewDidFinishLoad(webView: UIWebView) {
            loadIndicator.stopAnimating();
        }
        
        func webView(webView: UIWebView, didFailLoadWithError error: NSError?)
        {
            /// 提示框
            let alert = UIAlertController(title: "提示", message: error?.localizedDescription, preferredStyle: UIAlertControllerStyle.Alert);
            let action = UIAlertAction(title:"确定", style: UIAlertActionStyle.Default, handler: nil);
            alert
                .addAction(action);
            presentViewController(alert, animated: true, completion: nil);
            
        }
        
        
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            
        }
    
    
    }

[Center]: /images/20220728/15a6b3d1c742492f8c0636285af7f14c.png
[Center 1]: /images/20220728/eff932751bab4bc59a2878df08f17dc2.png