class film {
var head = ""
var duration = 0.0
var metaInfo: [String:String] {
return [
"head": self.head,
"duration":"\(self.duration)"
]
}
}
var movie = film()
movie.head = "Swift 属性"
movie.duration = 3.09
print(movie.metaInfo["head"]!)
print(movie.metaInfo["duration"]!)