Swift Development Note 07

Monitoring notifications

Notificationcenter. default. Addobserver (self, selector: #selector (libraryapi.downloadimage (_:)), Name: nsnotification. Name (rawValue: downloadimagenotification), object: nil)

Network download and main thread Refresh UI

Dispatchqueue. Global(). Async {

Let image = Self . Xiazaitupianwithurl (IMAGEURL)

Dispatchqueue. Main. Async {

Myimageview?. image = Image

Self . Persistencymanager. Baocuntupian (Image, FileName: URL (String:imageurl)!. lastpathcomponent)

}

}

File local Directory

Let path = nshomedirectory () + "/documents/\(filename)"

Enumeration

Enum Poketype {

Case Normal

Case Fire

Case Water

}

KVO

Myimgview. Addobserver (self, Forkeypath: "image", Options: [], Context: nil)

Override func Observevalue (forkeypath keypath: String?, of object: Any) , change: [Nskeyvaluechangekey: C5>any]?, context: unsafemutablerawpointer?) {

if KeyPath = = "image" {

indicator. stopanimating ()

}

}

//

Topviewcontroller

(Controllers[controllers.count-1] as! Uinavigationcontroller). Topviewcontroller as ? detailviewcontroller

Didset

var detailitem: nsdate? {

Didset {

Update the view.

Configureview ()

}

}

Swift Development Note 07