iOS常见控件的创建方法
import UIKit
class ViewController: UIViewController {
var myLabel: UILabel = UILabel()
var myView: UIView = UIView()
var myButton: UIButton = UIButton()
var myImageView: UIImageView = UIImageView()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.view.backgroundColor = UIColor.redColor()
self.myLabel = createLabel()
self.view.addSubview(self.myLabel)
self.myView = createView()
self.view.addSubview(self.myView)
self.myButton = createButton()
self.view.addSubview(self.myButton)
self.myImageView = createImageView()
self.view.addSubview(self.myImageView)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// UILabel
func createLabel() -> UILabel {
var label: UILabel = UILabel(frame: CGRectMake(10, 80, self.view.frame.size.width-20, 50))
label.backgroundColor = UIColor.greenColor()
label.textAlignment = NSTextAlignment.Center
label.text = "Hello Swift"
return label
}
// UIView
func createView() -> UIView {
var orginY = CGRectGetMaxY(self.myLabel.frame) + 10
var myView: UIView = UIView(frame: CGRectMake(10, orginY, self.view.frame.size.width-20, 30))
myView.backgroundColor = UIColor.whiteColor()
return myView;
}
// UIButton
func createButton() -> UIButton {
var orginY = CGRectGetMaxY(self.myView.frame) + 10
var button: UIButton = UIButton(frame: CGRectMake(10, orginY, self.view.frame.size.width-20, 30))
button.backgroundColor = UIColor.greenColor()
button.setTitle("Button", forState: UIControlState.Normal)
button.titleLabel?.font = UIFont.systemFontOfSize(18)
button.addTarget(self, action: "tappedButton:", forControlEvents: UIControlEvents.TouchUpInside)
button.tag = 100
return button
}
// UIImageView
func createImageView() -> UIImageView {
var orginY = CGRectGetMaxY(self.myButton.frame) + 10
var imageView: UIImageView = UIImageView(frame: CGRectMake((self.view.frame.size.width-100)/2, orginY, 100, 50))
var image: UIImage = UIImage(named: "user")!
imageView.image = image
return imageView
}
// Button target
func tappedButton(sender:UIButton!) {
println(sender.tag)
}
}
单列
import Foundation
class UtilSingleton: NSObject {
var iVal: Int = 0
class var shareInstance: UtilSingleton {
get {
struct Static {
static var instance: UtilSingleton? = nil
static var token: dispatch_once_t = 0
}
dispatch_once(&Static.token, {
Static.instance = UtilSingleton()
})
return Static.instance!
}
}
}
二维码扫描
import UIKit
import Foundation
import AVFoundation
class ViewController: UIViewController ,AVCaptureMetadataOutputObjectsDelegate {
let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
let session = AVCaptureSession()
var layer: AVCaptureVideoPreviewLayer?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.title = "二维码扫描"
self.view.backgroundColor = UIColor.grayColor()
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.setupCamera()
self.session.startRunning()
}
func setupCamera(){
self.session.sessionPreset = AVCaptureSessionPresetHigh
var error : NSError?
let input = AVCaptureDeviceInput(device: device, error: &error)
if (error != nil) {
println(error!.description)
return
}
if session.canAddInput(input) {
session.addInput(input)
}
layer = AVCaptureVideoPreviewLayer(session: session)
layer!.videoGravity = AVLayerVideoGravityResizeAspectFill
layer!.frame = CGRectMake(20,150,280,280);
self.view.layer.insertSublayer(self.layer, atIndex: 0)
let output = AVCaptureMetadataOutput()
output.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue())
if session.canAddOutput(output) {
session.addOutput(output)
output.metadataObjectTypes = [AVMetadataObjectTypeQRCode];
}
session.startRunning()
}
func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!){
var stringValue:String?
if metadataObjects.count > 0 {
var metadataObject = metadataObjects[0] as AVMetadataMachineReadableCodeObject
stringValue = metadataObject.stringValue
}
self.session.stopRunning()
println("code is \(stringValue)")
var alertView = UIAlertView()
alertView.delegate=self
alertView.title = "二维码"
alertView.message = "扫到的二维码内容为:\(stringValue)"
alertView.addButtonWithTitle("确认")
alertView.show()
}
}
