3.Swift 功能集锦（一）

3.Swift 功能集锦（一）

Swift 功能集锦一
WebView打开网页

UIImageView设置图片

ViewController添加子视图

自定义ViewController

自定义TableViewController

自定义TableView

WebView打开网页

UIWebView.loadRequest(request: NSURLRequest)

@IBOutlet weak var wv: UIWebView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.wv.loadRequest(NSURLRequest(URL:NSURL(string:"http://www.baidu.com")!))
}

UIImageView设置图片

UIImageView.image

UIImage.init?(named name: String)

@IBOutlet weak var ivv: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.ivv.image = UIImage(named: "m9.jpg")
}

ViewController添加子视图

ViewController.addSubview(view: UIView)

UIView.init(frame: CGRect)

如果不想直接在storyboard中给ViewController添加子View（UIButton、UILabel等），可以调用

ViewController.addSubview(view: UIView)

方法动态添加子View。

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
var label = UILabel(frame: CGRect(x: 50, y: 50, width: 200, height: 100))
label.text="Save you"
self.view.addSubview(label)
}

自定义ViewController

首先，New File -> Cocoa Touch Class

然后，选择继承自UIViewController

UIViewController.init(coder aDecoder: NSCoder)

如果新建一个ViewController，它要在storyboard中呈现的话，那么必须覆写

init(coder aDecoder: NSCoder)

方法。

class NewViewController: UIViewController {

required init(coder aDecoder: NSCoder) {
super.init(coder:aDecoder)!
}

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
var label = UILabel(frame: CGRect(x: 50, y: 50, width: 200, height: 100))
label.text="Save you"
self.view.addSubview(label)
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/

}

然后在storyboard中的的ViewController属性栏设置

Class

的内容：

自定义TableViewController

首先，New File -> Cocoa Touch Class

然后，选择继承自UITableViewController

1.在storyboard的TableViewController属性栏中设置

Class

2.给cell的

identifier

设置一个id，标识这个TableViewController中的每一个cell的id。



3.在cell中添加子View的时候，给每一个子View，设置一个tag，以供根据tag从cell中取得对应的子View（类似于Android中，BaseAdapter.getView中通过convertView.findViewById取得子View），这里就以给cell添加一个UILabel为例，给UILabel添加tag（这里设置为6）。

class TableViewController: UITableViewController {

// Label的tag值
let TAG_CELL = 6

override func viewDidLoad() {
super.viewDidLoad()

// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false

// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

// MARK: - Table view data source

// 设置有多少个Section
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}

// 设置有多少个cell
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return 3
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

// 第一个参数对应了刚才填写的"identifier"
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)
// Configure the cell...

// 子View的tag值取得子View
let label = cell.viewWithTag(TAG_CELL) as! UILabel
label.text = "Save you fron anything"
return cell as UITableViewCell
}

/*
// Override to support conditional editing of the table view.
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return NO if you do not want the specified item to be editable.
return true
}
*/

/*
// Override to support editing the table view.
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
// Delete the row from the data source
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
} else if editingStyle == .Insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/

/*
// Override to support rearranging the table view.
override func tableView(tableView: UITableView, moveRowAtIndexPath fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath) {

}
*/

/*
// Override to support conditional rearranging of the table view.
override func tableView(tableView: UITableView, canMoveRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return NO if you do not want the item to be re-orderable.
return true
}
*/

/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/

}

自定义TableView

首先，New File -> Cocoa Touch Class

然后，选择继承自UITableView

1.在storyboard的TableView属性栏中设置

Class

2.同上自定义TableViewController

3.同上自定义TableViewController

class MyTableView: UITableView,UITableViewDataSource,UITableViewDelegate {

// Label的tag值
let TAG_CELL = 6
// 用于读取plist
var dict:NSDictionary
required init(coder aDecoder: NSCoder) {
self.dict = NSDictionary(contentsOfURL: NSBundle.mainBundle().URLForResource("data", withExtension: "plist")!)!
super.init(coder: aDecoder)!
self.dataSource = self
self.delegate = self
}

// Section 个数
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 2
}

// item
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{
let cell: AnyObject? = tableView.dequeueReusableCellWithIdentifier("cell")
let label = cell!.viewWithTag(TAG_CELL) as! UILabel
label.text = (self.dict.allValues[indexPath.section] as! NSArray).objectAtIndex(indexPath.row) as? String
return cell as! UITableViewCell
}

//Header
func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return self.dict.allKeys[section] as? String
}

// Section 名称
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return (self.dict.allValues[section] as? NSArray)!.count
}

// item被点击的时候
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
NSLog("\(self.dict.allValues[indexPath.section].objectAtIndex(indexPath.row)) clicked")
}

// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func drawRect(rect: CGRect) {
// Drawing code
}

}