swift中UIWebView的使用

https://github.com/potato512/SYSwiftLearning



// 实例化
self.webview = UIWebView(frame: CGRectMake(0.0, CGRectGetHeight(segment.frame), CGRectGetWidth(self.view.bounds), (CGRectGetHeight(self.view.bounds) - CGRectGetHeight(segment.bounds))))
self.view.addSubview(self.webview!)

self.webview!.backgroundColor = UIColor.clearColor()

// 使用"|"无效，应改成[xx,xx,..]
// self.webview!.autoresizingMask = UIViewAutoresizing.FlexibleTopMargin | UIViewAutoresizing.FlexibleBottomMargin
self.webview!.autoresizingMask = [UIViewAutoresizing.FlexibleHeight, UIViewAutoresizing.FlexibleBottomMargin]
self.webview!.scrollView.scrollEnabled = true

// 设置代理对象（注意添加协议及实现代理方法）
self.webview!.delegate = self

// 释放，内存管理
deinit
{
self.webview?.delegate = nil
self.webview?.loadHTMLString("", baseURL: nil)
self.webview?.stopLoading()
self.webview?.removeFromSuperview()
self.webview = nil

NSURLCache.sharedURLCache().removeAllCachedResponses()
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}

// MARK: - UIWebViewDelegate
func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {
print("\(request),\(navigationType)")

// 用于控制子链接是否可以打开跳转
UIApplication.sharedApplication().networkActivityIndicatorVisible = true

return true
}

func webViewDidStartLoad(webView: UIWebView) {

// 加载开始
print("1 webViewDidStartLoad")

UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}

func webViewDidFinishLoad(webView: UIWebView) {
// 加载结束（加载成功）
print("2 webViewDidFinishLoad")

UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}

func webView(webView: UIWebView, didFailLoadWithError error: NSError?) {
// 加载结束（加载失败）
print("3 webView error = \(error)")

UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}

let item01 = UIBarButtonItem(title: "stop", style: UIBarButtonItemStyle.Done, target: self, action: Selector("buttonClick:"))
item01.tag = 1000
let item02 = UIBarButtonItem(title: "start", style: UIBarButtonItemStyle.Done, target: self, action: Selector("buttonClick:"))
item02.tag = 2000
self.navigationItem.rightBarButtonItems = [item01, item02]

// MARK: - 响应事件
func buttonClick(sender:UIBarButtonItem)
{
let index = sender.tag
if 1000 == index
{
// 停止
if (self.webview != nil)
{
if (self.webview!.loading)
{
self.webview!.stopLoading()

UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}
}
}
else if 2000 == index
{
// 开始
if (self.webview != nil)
{
if (!self.webview!.loading)
{
let request = NSURLRequest(URL: self.url)
self.webview!.loadRequest(request)

UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}
}
}
}

// 多按钮视图控件（控制webview的后退，前进，或重新加载属性）
let segment = UISegmentedControl(items: ["GoBack","GoForward","Reload"])
self.view.addSubview(segment)
segment.momentary = true
segment.frame = CGRectMake(0.0, 0.0, CGRectGetWidth(self.view.bounds), 40.0)
segment.addTarget(self, action: Selector("segmentValueChange:"), forControlEvents: UIControlEvents.ValueChanged)

// MARK: - segmentValueChange
func segmentValueChange(sender:UISegmentedControl)
{
let index = sender.selectedSegmentIndex;
switch (index)
{
case 0:
let isGoBack = self.webview!.canGoBack
if isGoBack
{
self.webview?.goBack()
}

case 1:

let isGoForward = self.webview!.canGoForward
if isGoForward
{
self.webview?.goForward()
}

case 2:
let isReload = self.webview!.loading
if !isReload
{
self.webview?.reload()

UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}
default : print("无效操作")
}
}