Standford 2015 iOS讀書會 week8

1. Application Lifecycle and Core Motion 2. Core Location

彼得潘

接收notification

userInfo: notification包含的額外資訊

func addObserver(observer: AnyObject, selector aSelector: Selector, name aName: String?, object anObject: AnyObject?)

⽅方法2:

發送notification時所在的thread，即是執⾏行Selector的thread

發送notification

func postNotification(notification: NSNotification)

func postNotificationName(aName: String, object anObject: AnyObject?) func postNotificationName(aName: String, object anObject: AnyObject?, userInfo aUserInfo: [NSObject : AnyObject]?)

移除notification

func removeObserver(observer: AnyObject)

func removeObserver(observer: AnyObject, name aName: String?, object anObject: AnyObject?)

沒有remove，notification傳送給死去的物件會crash

特例: controller在死去時會⾃自動remove

可以定期將App喚醒， 進⼊入background mode做事( 很短的時間)，

然後再進⼊入suspended mode

令⼈人遺憾的，程式無法知道App死亡，不能在死前完成⼀一些⼼心願

UIApplicationDidFinishLaunchingNotification會在 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool執⾏行完後才被呼叫。

background fetch: 觀察使⽤用者的使⽤用習慣，聰明地觸發某個時間點在背景抓資料

UIApplication

@property(nonatomic) NSInteger applicationIconBadgeNumber;

var statusBarFrame: CGRect { get }

預設⾼高度20，開啟熱點時變40

AirDrop

Document Types & Imported UTIs

Document Types & Imported UTIs

http://www.infragistics.com/community/blogs/stevez/archive/2013/03/04/associate-a-file-type-with-your-ios-application.aspx

https://developer.apple.com/library/ios/documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html#//apple_ref/doc/uid/TP40009259-SW1

http://www.infragistics.com/community/blogs/stevez/archive/2013/03/05/ios-tips-and-tricks-associate-a-file-type-with-your-app-part-2.aspx

可以接收

func application(application: UIApplication, handleOpenURL url: NSURL) -> Bool { // post a notification when a GPX file arrives let center = NSNotificationCenter.defaultCenter() let notification = NSNotification(name: GPXURL.Notification, object: self, userInfo: [GPXURL.Key:url]) center.postNotification(notification) return true }

center.postNotificationName(GPXURL.Notification, object: self, userInfo: [GPXURL.Key:url])

發送Notification

也可以

struct GPXURL { static let Notification = "GPXURL Radio Station" static let Key = "GPXURL URL Key" }

接收Notificationoverride func viewDidLoad() { super.viewDidLoad() // sign up to hear about GPX files arriving let center = NSNotificationCenter.defaultCenter() let queue = NSOperationQueue.mainQueue() let appDelegate = UIApplication.sharedApplication().delegate

center.addObserverForName(GPXURL.Notification, object: appDelegate, queue: queue) { notification in if let url = notification?.userInfo?[GPXURL.Key] as? NSURL { self.textView.text = "Received \(url)" } } }

耗電

X Y Z

直立的方向home按鈕在下方螢幕和地板垂直

0 -1 0

直立的方向home按鈕在上方螢幕和地板垂直

0 1 0

水平的方向右長邊在下螢幕和地板垂直

1 0 0

水平的方向右長邊在上螢幕和地板垂直

-1 0 0

螢幕面對天花板 0 0 -1

螢幕面對地板 0 0 1

(1) 將iPhone傾向下短邊。

結果: y < 0

(2) 將iPhone傾向上短邊。

結果: y > 0

(3) 將iPhone傾向左長邊。

結果: x < 0

(4) 將iPhone傾向右長邊。

結果: x > 0

iPhone繞著從天⽽而降的重⼒力⽅方向旋轉， -> 偵偵到的x, y, z值維持定值

偵測旋轉

磁⼒力

結合三種sensor資料後，分析出來的數據

lazy var blockBehavior: UIDynamicItemBehavior = { let lazilyCreatedBlockBehavior = UIDynamicItemBehavior() lazilyCreatedBlockBehavior.allowsRotation = true lazilyCreatedBlockBehavior.elasticity = 0.85 lazilyCreatedBlockBehavior.friction = 0 lazilyCreatedBlockBehavior.resistance = 0 return lazilyCreatedBlockBehavior }()

let motionManager = AppDelegate.Motion.Manager if motionManager.accelerometerAvailable { motionManager.startAccelerometerUpdatesToQueue(NSOperationQueue.mainQueue()) { (data, error) -> Void in self.bouncer.gravity.gravityDirection = CGVector(dx: data.acceleration.x, dy: -data.acceleration.y) } }

Core Location

愈準，愈要耗費⼼心⼒力，愈耗電

timestamp: 偵測到位置的時間點，幫助判斷資料是否過時

設定模擬器位置

設定模擬器位置

取得使⽤用者位置的權限

取得使⽤用者位置的權限

只有使⽤用者還沒回答過的情況下會出現。(⼀一次表⽩白的機會)

如果重新安裝會再出現 (下輩⼦子可以重新表⽩白)

如何知道使⽤用者reject(⽐比猜出表⽩白被reject簡單)

[CLLocationManager authorizationStatus];

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status;

當使⽤用者點選權限詢問視窗後觸發

算距離

- (CLLocationDistance)distanceFromLocation:(const CLLocation *)location ;

公尺

可從經緯度建⽴立CLLocation物件

在背景啟動

搭配requestAlwaysAuthorization

在背景持續取得使⽤用者位置

App介紹的耗電提醒

App Store上的App⽂文字介紹需注明因在背景抓取位置造成耗電，否則將被退件

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