2017年3月29日 星期三
2017年3月26日 星期日
how-to-rotate-image-in-swift-3
Ref : http://stackoverflow.com/questions/40882487/how-to-rotate-image-in-swift-3
extension UIImage {
func fixImageOrientation() -> UIImage? {
var flip:Bool = false //used to see if the image is mirrored
var isRotatedBy90:Bool = false // used to check whether aspect ratio is to be changed or not
var transform = CGAffineTransform.identity
//check current orientation of original image
switch self.imageOrientation {
case .down, .downMirrored:
transform = transform.rotated(by: CGFloat(M_PI));
case .left, .leftMirrored:
transform = transform.rotated(by: CGFloat(M_PI_2));
isRotatedBy90 = true
case .right, .rightMirrored:
transform = transform.rotated(by: CGFloat(-M_PI_2));
isRotatedBy90 = true
case .up, .upMirrored:
break
}
switch self.imageOrientation {
case .upMirrored, .downMirrored:
transform = transform.translatedBy(x: self.size.width, y: 0)
flip = true
case .leftMirrored, .rightMirrored:
transform = transform.translatedBy(x: self.size.height, y: 0)
flip = true
default:
break;
}
// calculate the size of the rotated view's containing box for our drawing space
let rotatedViewBox = UIView(frame: CGRect(origin: CGPoint(x:0, y:0), size: size))
rotatedViewBox.transform = transform
let rotatedSize = rotatedViewBox.frame.size
// Create the bitmap context
UIGraphicsBeginImageContext(rotatedSize)
let bitmap = UIGraphicsGetCurrentContext()
// Move the origin to the middle of the image so we will rotate and scale around the center.
bitmap!.translateBy(x: rotatedSize.width / 2.0, y: rotatedSize.height / 2.0);
// Now, draw the rotated/scaled image into the context
var yFlip: CGFloat
if(flip){
yFlip = CGFloat(-1.0)
} else {
yFlip = CGFloat(1.0)
}
bitmap!.scaleBy(x: yFlip, y: -1.0)
//check if we have to fix the aspect ratio
if isRotatedBy90 {
bitmap?.draw(self.cgImage!, in: CGRect(x: -size.width / 2, y: -size.height / 2, width: size.height,height: size.width))
} else {
bitmap?.draw(self.cgImage!, in: CGRect(x: -size.width / 2, y: -size.height / 2, width: size.width,height: size.height))
}
let fixedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return fixedImage
}ios save image with name
Ref : http://stackoverflow.com/questions/35796218/ios-save-image-with-name
let newImage = UIImage.init(named: "myimage")
let date :NSDate = NSDate()
let dateFormatter = NSDateFormatter()
//dateFormatter.dateFormat = "yyyy-MM-dd'_'HH:mm:ss"
dateFormatter.dateFormat = "yyyy-MM-dd'_'HH_mm_ss"
dateFormatter.timeZone = NSTimeZone(name: "GMT")
let imageName = "/\(dateFormatter.stringFromDate(date)).jpg"
print(imageName)
//var paths: [AnyObject] = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true)
//var documentsDirectoryPath = getDocumentsURL().relativePath
var documentsDirectoryPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
documentsDirectoryPath += imageName
print(documentsDirectoryPath)
let settingsData: NSData = UIImageJPEGRepresentation(newImage!, 1.0)!
settingsData.writeToFile(documentsDirectoryPath, atomically: true)2017年3月25日 星期六
The Easy Way to Switch Container Views in iOS
Ｒef : https://spin.atomicobject.com/2015/09/02/switch-container-views/
1. First, add a container view to your view controller. I applied a blue color to the child view controller so you could tell the difference between the two.
2. Next, position and constrain the container view however you want it to appear in your parent view controller.
3. Then drag a second container view right on top of container view A as shown here.
4. Constrain container view B to have equal width and height to container view A, and center container view B to the middle of container view A. This way, any layout changes that happen to our first container view will be applied to the second. They should both be the same size and have the same position.
class ViewController: UIViewController {
@IBOutlet weak var containerViewA: UIView!
@IBOutlet weak var containerViewB: UIView!
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func showComponent(_ sender: UISegmentedControl) {
if sender.selectedSegmentIndex == 0 {
UIView.animate(withDuration: 0.5, animations: {
self.containerViewA.alpha = 1
self.containerViewB.alpha = 0
})
} else {
UIView.animate(withDuration: 0.5, animations: {
self.containerViewA.alpha = 0
self.containerViewB.alpha = 1
})
}
}
}
custom camera view in ios
Ref : https://github.com/codepath/ios_guides/wiki/Creating-a-Custom-Camera-View
上面的是UIView -> previewView
左下角是button
右下角是ImageView()
自己try 玩得結果
上面的是UIView -> previewView
左下角是button
右下角是ImageView()
自己try 玩得結果
import UIKit
import AVFoundation
class ViewController: UIViewController {
var session: AVCaptureSession?
var stillImageOutput: AVCaptureStillImageOutput?
var videoPreviewLayer: AVCaptureVideoPreviewLayer?
@IBOutlet weak var previewView: UIView!
@IBOutlet weak var captureImageView: UIImageView!
@IBAction func didTakePhoto(_ sender: Any) {
print("takePhoto")
/*
if let videoConnection = stillImageOutput!.connection(withMediaType: AVMediaTypeVideo) {
// ...
// Code for photo capture goes here...
stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: { (sampleBuffer, error) -> Void in
// ...
// Process the image data (sampleBuffer) here to get an image file we can put in our captureImageView
if sampleBuffer != nil {
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
let dataProvider = CGDataProviderCreateWithCFData(imageData)
let cgImageRef = CGImageCreateWithJPEGDataProvider(dataProvider, nil, true, CGColorRenderingIntent.RenderingIntentDefault)
let image = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Right)
// ...
// Add the image to captureImageView here...
self.captureImageView.image = image
}
})
}*/
// var videoConnection :AVCaptureConnection?
if let videoConnection = stillImageOutput?.connection(withMediaType: AVMediaTypeVideo){
print("videoConnection")
/*
stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: { (buffer:CMSampleBuffer!, error: NSError!) -> Void in
if let exifAttachments = CMGetAttachment(buffer, kCGImagePropertyExifDictionary, nil) {
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer)
self.previewImage.image = UIImage(data: imageData)
UIImageWriteToSavedPhotosAlbum(self.previewImage.image, nil, nil, nil)
}
})
*/
stillImageOutput?.captureStillImageAsynchronously(from: videoConnection) {
(imageDataSampleBuffer, error) -> Void in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer)
self.captureImageView.image = UIImage(data: imageData!)
UIImageWriteToSavedPhotosAlbum(UIImage(data: imageData!)!, nil, nil, nil)
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
setup()
let cellImage = UIImage(named: "path.png")//Array(Array(model.categories.values)[cellCount])[1]
let imageView = UIImageView(image: cellImage as UIImage?)
imageView.frame = CGRect(x: 0, y:0, width: 300, height: 300)
view.addSubview(imageView)
// self.view.bringSubviewToFront()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Setup your camera here...
videoPreviewLayer!.frame = previewView.bounds
}
func setup2(){
}
func setup(){
session = AVCaptureSession()
session!.sessionPreset = AVCaptureSessionPresetPhoto
let backCamera = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
var error: NSError?
var input: AVCaptureDeviceInput!
do {
input = try AVCaptureDeviceInput(device: backCamera)
} catch let error1 as NSError {
error = error1
input = nil
print(error!.localizedDescription)
}
if error == nil && session!.canAddInput(input) {
session!.addInput(input)
// ...
// The remainder of the session setup will go here...
}
//var stillImageOutput : AVCaptureStillImageOutput?
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput?.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if session!.canAddOutput(stillImageOutput) {
session!.addOutput(stillImageOutput)
// ...
// Configure the Live Preview here...
videoPreviewLayer = AVCaptureVideoPreviewLayer(session: session)
videoPreviewLayer!.videoGravity = AVLayerVideoGravityResizeAspect
videoPreviewLayer!.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
previewView.layer.addSublayer(videoPreviewLayer!)
session!.startRunning()
}
}
}
2017年3月23日 星期四
請問有人知道如何在post request加上header cookie嗎？
Ref : http://stackoverflow.com/questions/36372341/swift-http-request-with-parameters-in-header
var request = URLRequest(url: url)
request.setValue("secret-keyValue", forHTTPHeaderField: "secret-key")
URLSession.shared.dataTask(with: request) { data, response, error in }2017年3月22日 星期三
呈現所關注的用戶的影像和留言
想法是這樣....
兩階段的資料庫的找法
先去查 Followers entity
找出目前登入者有關注的人的所有名單, 放在 followeringusers array
然後在這個 followeringusers array...
去找 entity name 為 Posts .... 所記錄的圖片和留言
func searchFollower(){
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
let followersrequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Followers")
followersrequest.predicate = NSPredicate(format: "follower = %@", currentUser)
followersrequest.returnsObjectsAsFaults = false
do{
let followersResults = try context.fetch(followersrequest)
if(followersResults.count > 0 ){
for followersResult in followersResults as! [NSManagedObject] {
let followeringUser = followersResult.value(forKey: "following") as! String
followeringusers.append(followeringUser)
}
}
}catch{
}
// 加上自己
followeringusers.append(currentUser)
for followinguser in followeringusers {
let postsRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Posts")
postsRequest.predicate = NSPredicate(format: "username = %@", followinguser)
postsRequest.returnsObjectsAsFaults = false
do {
let results = try context.fetch(postsRequest)
if results.count > 0 {
for result in results as! [NSManagedObject]{
let username = result.value(forKey: "username") as! String
let message = result.value(forKey: "message") as! String
let image = result.value(forKey: "image") as! NSData
usernames.append(username)
messages.append(message)
imageFiles.append(image)
}
}
}catch{
print("Could not fin following User info")
}
}
//print(followeringusers)
}
找完之後... 在 這邊加載
圖片這邊... 要做一下處理.. 先把 NSData 轉成 Ｄata... 然後呼叫 UIimage(data: data)
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! FeedTableViewCell
// Configure the cell...
cell.usernameLabel.text = usernames[indexPath.row]
cell.messageLabel.text = messages[indexPath.row]
cell.postedImage.image = UIImage(data: imageFiles[indexPath.row] as Data)
return cell
}
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