IOS 系统常用功能

打开网页：

    @IBAction func haha(sender: AnyObject) {

        UIApplication.sharedApplication().openURL(NSURL(string: "http://xxxxx.com")!)
    }

打电话：

    @IBAction func dianhua(sender: AnyObject) {
        UIApplication.sharedApplication().openURL(NSURL(string: "tel://10086")!)
    }

发短信：

    @IBAction func duanxin(sender: AnyObject) {
        UIApplication.sharedApplication().openURL(NSURL(string: "sms://10086")!)
    }

发邮件：

    @IBAction func youjian(sender: AnyObject) {
        UIApplication.sharedApplication().openURL(NSURL(string: "mailto://xxx@me.com")!)
    }