iOS常用控件-CFANZ编程社区

本篇会介绍如下 TextFireld、TextView、Button、Segment、Label、Slider、WebView、ActivityIndicator、Progress、Alert(DEPRECATED)、ActionSheet(DEPRECATED)、ActionControl、ToolBar、Bar Button Item

PageA

TextField & TextView-输入完成点击 return 键盘消失

当前类实现接口

class ViewController: UIViewController, UITextFieldDelegate, UITextViewDelegate

实现对应的接口方法

// 主动放弃焦点
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
  textField.resignFirstResponder()
  return true
}

// 主动放弃焦点
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
  if text == "\n" {
    textView.resignFirstResponder()
    return false
  }
  return true
}

Switch-让右开关随左开关联动

@IBAction func rightSwitchControl(_ sender: UISwitch) {
  var setting = sender.isOn // 获取左开关的开闭状态
  self.swLeft.setOn(setting, animated: true)
  self.swRight.setOn(setting, animated: true)
}

Segment-用分段控件控制两个开关的显示与隐藏

@IBAction func showOrHideSwitch(_ sender: UISegmentedControl) {
  if self.swLeft.isHidden { // 获取左开关的隐藏状态
    self.swLeft.isHidden = false
    self.swRight.isHidden = false
  } else {
    self.swLeft.isHidden = true
    self.swRight.isHidden = true
  }
}

Slider-显示滑块的值

@IBAction func slideValueChangeLabel(_ sender: UISlider) {
  var progressAsInt = sender.value // 获取滑块的值
  let newResult = NSString(format: "%d", progressAsInt)
  self.lbValue.text = newResult as String
}

WebView-加载网页

loadHTMLString 加载本地页面

let html = "<h1>welcome <a href='http://catface.cc'>catface</a></h1>"
wv_home.loadHTMLString(html, baseURL: nil)

loadData 加载本地页面(略)
loadRequest 加载网络页面

let addr = NSURL(string: "http://catface.cc")
let request = NSURLRequest(url: addr! as URL) // 将URL封装成Request
self.wv_home.loadRequest(request as URLRequest)

// 必不可少，将WebView的委托对象(当前视图控制器)分配给WebView->监听
self.wv_home.delegate = self

可选实现 UIWebViewDelegate 接口的如下方法

// 页面加载完成后调用
func webViewDidFinishLoad(_ webView: UIWebView) {
  NSLog("%@", wv_home.stringByEvaluatingJavaScript(from: "document.body.innerhtml")!)
}

注意 - 加载http网址系统会发出不安全警告！！！处理方法如下

在Info.plist中添加 NSAppTransportSecurity(类型 Dictionary)
在 NSAppTransportSecurity 下添加 NSAllowsArbitraryLoads(值设为 YES)

PageB

ActivityIndicator-使用按钮控制其动画开闭

if self.aiv_test.isAnimating { // 判断当前aiv是否正进行动画
  aiv_test.stopAnimating()
} else {
  aiv_test.startAnimating()
}

Progress-使用 Timer 控制进度条的进度

var mTimer: Timer!  // 来一个Timer
@IBAction func changePV(_ sender: UIButton) {
  // 参数：时间间隔s | 消息发送目标 | 调用方法 | 给消息发送参数 | 是否重复
  mTimer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: "download", userInfo: nil, repeats: true)
}

func download() {
  pv_test.progress += 0.1
  if pv_test.progress == 1.0 {
    mTimer.invalidate()
    var alert = UIAlertView(title: "下载完成", message: "下载结束哦，哥哥", delegate: nil, cancelButtonTitle: "OK")
    alert.show()
    return
  }
}

Alert、ActionSheet被ActionControl替代(IOS8)

- **Alert**
    
    ```
    // 单个选项
    UIAlertView(title: "警告", message: "我是警告内容", delegate: nil, cancelButtonTitle: "知道").show()
    
    // 两个选项
    UIAlertView(title: "警告", message: "我是警告内容", delegate: nil, cancelButtonTitle: "取消", otherButtonTitles: "确定").show()
    
    // 多个选项...
    UIAlertView(title: "警告", message: "我是警告内容", delegate: nil, cancelButtonTitle: "取消", otherButtonTitles: "确定", "玩一玩").show()
    ```
    
- **ActionSheet**    

    ```
    var asTest: UIActionSheet = UIActionSheet(title: "选择列表", delegate: nil, cancelButtonTitle: "取消", destructiveButtonTitle: "破坏性选项", otherButtonTitles: "百度", "腾讯", "阿里")
    asTest.show(in: self.view)
    ```
    
- **ActionControl(掌握这个可以了)**

    ```     
    var acTest: UIAlertController = UIAlertController(title: "标题", message: "消息内容", preferredStyle: UIAlertControllerStyle.alert)
    
    acTest.addAction(UIAlertAction(title: "取消", style: UIAlertActionStyle.cancel) {(alertAction) -> Void in NSLog("取消")})
    acTest.addAction(UIAlertAction(title: "确定", style: UIAlertActionStyle.default) {(alertAction) -> Void in NSLog("确定")})
    
    self.present(acTest, animated: true, completion: nil)
    ```
        
    ---
       
    ```
    var acTest: UIAlertController = UIAlertController()
    
    acTest.addAction(UIAlertAction(title: "取消", style: UIAlertActionStyle.cancel) {(alertAction) -> Void in NSLog("取消")})
    acTest.addAction(UIAlertAction(title: "破坏性选项", style: UIAlertActionStyle.destructive) {(alertAction) -> Void in NSLog("破坏")})
    acTest.addAction(UIAlertAction(title: "百度", style: UIAlertActionStyle.default) {(alertAction) -> Void in NSLog("百度")})
    acTest.addAction(UIAlertAction(title: "腾讯", style: UIAlertActionStyle.default) {(alertAction) -> Void in NSLog("腾讯")})
    acTest.addAction(UIAlertAction(title: "阿里", style: UIAlertActionStyle.default) {(alertAction) -> Void in NSLog("阿里")})
    
    self.present(acTest, animated: true, completion: nil)  
    ```