addSnapShotListener()
QuerySnapShot.getDocumentChange()
DocumentChange
도큐먼트체인지obj.getDocument()
도큐먼트체인지obj.getOldIndex()
도큐먼트체인지obj.getNewIndex()
도큐먼트체인지obj.getType()
addSnapShotListener()
QuerySnapShot.getDocumentChange()
DocumentChange
도큐먼트체인지obj.getDocument()
도큐먼트체인지obj.getOldIndex()
도큐먼트체인지obj.getNewIndex()
도큐먼트체인지obj.getType()
Getting device orientation in Swift
original source : https://stackoverflow.com/questions/25796545/getting-device-orientation-in-swift
Swift 4:
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
if UIDevice.current.orientation.isLandscape {
print("landscape")
} else {
print("portrait")
}
}Getting device orientation in Swift
original source : https://stackoverflow.com/questions/25796545/getting-device-orientation-in-swift
Swift 4:
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
if UIDevice.current.orientation.isLandscape {
print("landscape")
} else {
print("portrait")
}
}How to lock orientation of one view controller to portrait mode only in Swift
original source : https://stackoverflow.com/questions/28938660/how-to-lock-orientation-of-one-view-controller-to-portrait-mode-only-in-swift
#1 answer
Things can get quite messy when you have a complicated view hierarchy, like having multiple navigation controllers and/or tab view controllers.
This implementation puts it on the individual view controllers to set when they would like to lock orientations, instead of relying on the App Delegate to find them by iterating through subviews.
Swift 3 & 4
In AppDelegate:
/// set orientations you want to be allowed in this property by default
var orientationLock = UIInterfaceOrientationMask.all
func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
return self.orientationLock
}In some other global struct or helper class, here I created AppUtility:
struct AppUtility {
static func lockOrientation(_ orientation: UIInterfaceOrientationMask) {
if let delegate = UIApplication.shared.delegate as? AppDelegate {
delegate.orientationLock = orientation
}
}
/// OPTIONAL Added method to adjust lock and rotate to the desired orientation
static func lockOrientation(_ orientation: UIInterfaceOrientationMask, andRotateTo rotateOrientation:UIInterfaceOrientation) {
self.lockOrientation(orientation)
UIDevice.current.setValue(rotateOrientation.rawValue, forKey: "orientation")
}
}Then in the desired ViewController you want to lock orientations:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
AppUtility.lockOrientation(.portrait)
// Or to rotate and lock
// AppUtility.lockOrientation(.portrait, andRotateTo: .portrait)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Don't forget to reset when view is being removed
AppUtility.lockOrientation(.all)
}If iPad or Universal App
Make sure that “Requires full screen” is checked in Target Settings -> General -> Deployment Info. supportedInterfaceOrientationsFor delegate will not get called if that is not checked.
How to lock orientation of one view controller to portrait mode only in Swift
original source : https://stackoverflow.com/questions/28938660/how-to-lock-orientation-of-one-view-controller-to-portrait-mode-only-in-swift
#1 answer
Things can get quite messy when you have a complicated view hierarchy, like having multiple navigation controllers and/or tab view controllers.
This implementation puts it on the individual view controllers to set when they would like to lock orientations, instead of relying on the App Delegate to find them by iterating through subviews.
Swift 3 & 4
In AppDelegate:
/// set orientations you want to be allowed in this property by default
var orientationLock = UIInterfaceOrientationMask.all
func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
return self.orientationLock
}In some other global struct or helper class, here I created AppUtility:
struct AppUtility {
static func lockOrientation(_ orientation: UIInterfaceOrientationMask) {
if let delegate = UIApplication.shared.delegate as? AppDelegate {
delegate.orientationLock = orientation
}
}
/// OPTIONAL Added method to adjust lock and rotate to the desired orientation
static func lockOrientation(_ orientation: UIInterfaceOrientationMask, andRotateTo rotateOrientation:UIInterfaceOrientation) {
self.lockOrientation(orientation)
UIDevice.current.setValue(rotateOrientation.rawValue, forKey: "orientation")
}
}Then in the desired ViewController you want to lock orientations:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
AppUtility.lockOrientation(.portrait)
// Or to rotate and lock
// AppUtility.lockOrientation(.portrait, andRotateTo: .portrait)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Don't forget to reset when view is being removed
AppUtility.lockOrientation(.all)
}If iPad or Universal App
Make sure that “Requires full screen” is checked in Target Settings -> General -> Deployment Info. supportedInterfaceOrientationsFor delegate will not get called if that is not checked.
Conversion between String, NSString, NSData and [UInt8] array in Swift
original source : http://studyswift.blogspot.com/2016/02/conversion-between-string-nsstring.html
The code below shows how to convert a string to a UInt8 array and then back to string. The code includes:
1. Step-by-step conversion between the String, NSString, NSData, and [UInt8] in this procedure:
String -> NSString -> NSData -> [UInt8] -> NSData -> NSString -> String
2. Direct conversion between String and [UInt8]:
String -> [UInt8] -> String
Swift Code:
Update – May 19, 2017 Swift 3.1 (Xcode 8.3.2)
let myString = “This is my string.”
//1.Conversion between the String, NSString, NSData, and [UInt8]//Convert String to NSStringlet myNSString = myString as NSString
//Convert NSString to NSData
let myNSData = myNSString.data(using: String.Encoding.utf8.rawValue)!
//Convert NSData to [UInt8] array
let myArray = [UInt8](myNSData)
//Convert [UInt8] to NSData
let resultNSData = NSData(bytes: myArray, length: myArray.count)
//Convert NSData to NSString
let resultNSString = NSString(data: resultNSData as Data, encoding: String.Encoding.utf8.rawValue)!
//Convert NSString to String
let resultString = resultNSString as String
print(resultString)
//2.Direct conversion between the String and [UInt8]
//Directly convert string to [UInt8]let directArray : [UInt8] = Array(myString.utf8)
//Directly convert [UInt8] to String
let directResultString = NSString(bytes: directArray, length:
directArray.count, encoding: String.Encoding.utf8.rawValue)! as String
print(directResultString)
Original Post: Feb. 22, 2016 with Swift 2.1
let myString = “This is my string.”
//1.Conversion between the String, NSString, NSData, and [UInt8]//Convert String to NSStringlet myNSString = myString as NSString //Convert NSString to NSDatalet myNSData = myNSString.dataUsingEncoding(NSUTF8StringEncoding)! //Get length of [UInt8]let length = myNSData.length //Convert NSData to [UInt8] arrayvar myArray = [UInt8](count: length, repeatedValue: 0)myNSData.getBytes(&myArray, length: length) //Convert [UInt8] to NSDatalet resultNSData = NSData(bytes: &myArray, length: length) //Convert NSData to NSStringlet resultNSString = NSString(data: resultNSData, encoding:NSUTF8StringEncoding)! //Convert NSString to String
let resultString = resultNSString as String
print(resultString)
//2.Direct conversion between the String and [UInt8]
//Directly convert string to [UInt8]let directArray : [UInt8] = Array(myString.utf8) //Directly convert [UInt8] to Stringlet directResultString = NSString(bytes: directArray, length:
directArray.count, encoding: NSUTF8StringEncoding) as! String
print(directResultString)