ViewContrller

新增背景圖片
- self.view.backgroundColor = UIColor(patternImage: UIImage(named: "background.png"))
Deinit never be called
- There's strong reference
取消鍵盤的方式

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

        super.touchesBegan(touches, with:event)
        self.view.endEditing(true)
    }

設定Textfield的鍵盤格式

self.promoTextField.keyboardType = UIKeyboardType.EmailAddress

新增分頁控制器的做法
- 先從Xcode的Editor -> Embed in -> Tab Bar Controller 新增一個TabBarController
- 再新增一個NavigationController
- 按住 CTRL + TabBarController的空白處，拖曳到NavigationController上後放開，選擇Relationshp Segue - View Controller

用Label畫直線

let lineView = UIView(frame: CGRect(x: 0, 
          y: label.bounds.size.height / 2,
          width: label.bounds.size.width,
          height: 1)) 
lineView.backgroundColor = UIColor.blackColor();
label.addSubview(lineView)

Label or Button 顯示圓角

myLabel.layer.masksToBounds = true
myLabel.layer.cornerRadius = 5

新增Spinner
- 先宣告 @IBOutlet var spinner:UIActivityIndicatorView!
- 在要顯示的地方新增
```
self.spinner.hidesWhenStopped = true
self.spinner.center = self.view.center
view.addSubview\(spinner\)  
spinner.startAnimating
```
- 在要停止的地方新增
  
  OperationQueue.main.addOperation { self.spinner.stopAnimating() }
出現whose view is not in the window hierarchy!的解法
- 在 viewDidAppear 呼叫就能避免現象，說是在 viewDidLoad 時沒有 Window Hierarchy資訊

Popover for iPad

Button

actionSheet.popoverPresentationController?.sourceView = button
actionSheet.popoverPresentationController?.sourceRect = button.bounds;
actionSheet.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.Left;

BarButtonItem

actionSheet.popoverPresentationController?.barButtonItem = button
actionSheet.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.Up;

Popover 出現的 View 不要圓角，改回直角的方法

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    self.view.superview?.layer.cornerRadius = 0.0
}

在ViewController內新增TableView，然後能控制TableView內的Component的方式
- 先創造UITableCell的SubClass，然後將Table的Cell的Class指定為剛剛建立的SubClass，並且讓ViewController多繼承UITableViewDelegate, UITableViewDataSource，並且在ViewController的viewDidLoad函式內，新增table.delegate = self & table.dataSource = self，最後是在ViewController的Class內實作tableView(_: didSelectRowAt:) & tableView(_: cellForRowAt:) & numberOfSectionsInTableView 這三個函式
- 然後要取用Table內的元件，可以這樣調用let cell = tableView.dequeueReusableCellWithIdentifier("MyCustomTableViewCell", forIndexPath: indexPath) as! MyCustomTableViewCell，之後再用cell.MyLabel.text = someString賦予值
使用dismiss發生 transitionViewForCurrentTransition is not set, presentation controller was dismissed during the presentation? (<_UIAlertControllerAlertPresentationController:0x78feff20>) 的解決方式
- 直接關掉第二個ViewController，會連第一個一起關掉
- 使用DispatchQueue.main.async{} 去執行dismiss
- 發生原因可能是第一個ViewController還在dismiss時，第二個還在presenting的時候又要dismiss第二個所導致
- ```
DispatchQueue.main.async {
    self?.presentingViewController?.presentingViewController?.dismiss(animated: true, completion: nil)
}
```

Slider用法

設定maximumValue & minimumValue & value

self.slider.maximumValue = 10
self.slider.minimumValue = 1
self.slider.setValue(1, animated: true)

設定滑動事件

@IBAction func sliderValueChanged (sender: UISlider){
  self.currentPage = Int(sender.value)
  self.changePage(currentPage: self.currentPage)
}

Navigation Bar換顏色
- navigationController.navigationBar.barTintColor = UIColor.greenColor()
Navigation Bar設定Title
- self.myButton.setTitle(titleString, for: .normal)，字串一定會顯示完整
- 使用self.myButton.titleLabel?.text = titleString的話，會有字串顯示不完全的問題
使用RGB的顏色
- cell.backgroundColor = UIColor(red: 0.5, green: 0.5, blue: 0.5, alpha: 1.0)
隱藏鍵盤
- 使用Extension Class的方式來擴充隱藏鍵盤功能，可支援任意個ViewContrller。

做xib的注意事項

增加xib的方式

override func viewDidLoad () {
    super.viewDidLoad()

    let nib = UINib(nibName: "NewBrowseStoreTableViewCell", bundle: nil) //nib的檔案名稱
    tableView.register(nib, forCellReuseIdentifier: "NewBrowseStoreTableViewCell") //nib的Identifier
}

xib最底下那層View是UIView類別

要把SearchBar固定在不是TableHaed和Navigation Bar的方法
- 先建立一個UIView
- 再把Search Bar新增到剛剛的UIView
連續取消兩個ViewController的方式

self?.presentingViewController?.presentingViewController?.dismiss(animated: true, completion: nil)

取消當前的View
- dismiss(animated: true, completion: nil)

PickerView改變選項的字型和顏色的方法

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView!) -> UIView
{
  var pickerLabel = UILabel()
  pickerLabel.textColor = UIColor.blackColor()
  pickerLabel.text = "PickerView Cell Title"
  pickerLabel.font = UIFont(name: "Arial-BoldMT", size: 15) 
  pickerLabel.textAlignment = NSTextAlignment.Center

  return pickerLabel
}

NavigationBar的BackItem屬於前一頁ViewController的，不是當頁的
用程式顯示其他的ViewController

    if let vc = self.storyboard?.instantiateViewController(withIdentifier: "TabBarViewController") {

        self.present(vc, animated: true, completion: nil)
    }

取消Table的Cell之間的線

sel.tableView.separatorStyle= .none

更換button的文字和圖片

self.mapButton.setTitle("Map", for: .normal)
self.sortButton.setImage(UIImage(named: "btn_sort_n"), for: .normal)

想要每次返回ViewController的時候重新load data
- 寫在viewWillAppear內，viewDidLoad不會重新再被call到

TextView的鍵盤要收起來

讓viewController實作 UITextViewDelegate

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

新增手勢

在viewDidLoad內宣告手勢

        let tap = UITapGestureRecognizer(target: self, action: #selector(zoomInOutImage))
        self.crashImgView.addGestureRecognizer(tap)

然後實作function

func zoomInOutImage(_ sender: UITapGestureRecognizer) {
    print("Do somthimg hehe....")
}

隱藏NavigationBar和TabBar

   self.navigationController?.navigationBar.isHidden = false
   self.tabBarController?.tabBar.isHidden = false

用程式添加UIBarButtonItem

        let image = UIImage(named: "icon_save_resize")
        let saveItem = UIBarButtonItem(image: image, style: UIBarButtonItemStyle.plain, target: self, action: #selector(saveNote))
        self.navigationItem.setRightBarButton(saveItem, animated: true)

ViewContrller

ViewContrller

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