Created
June 7, 2017 15:44
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Attempting to use the new block-based KVO in Xcode 9 and Swift 4
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| //: Playground - noun: a place where people can play | |
| import Foundation | |
| class HelloThere: NSObject { | |
| @objc var value: String = "" | |
| } | |
| let object = HelloThere() | |
| let observer = object.observe(\.value) { (object, change) in | |
| print("Changed to \(object.value)") | |
| } | |
| object.value = "1" | |
| object.value = "2" | |
| object.value = "3" | |
| print("At end") |
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This just prints "At end"—none of the KVO notifications actually fire.