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| Language | Swift |
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| Snippet Metadata | |
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| Owner | w3xue |
| Created | |
| Modified | |
| Visibility | Public |
class Samplepgm {
var counter: Int = 0{
willSet(newTotal){
print("计数器: \(newTotal)")
}
didSet{
if counter > oldValue {
print("新增数 \(counter - oldValue)")
}
}
}
}
let NewCounter = Samplepgm()
NewCounter.counter = 100
NewCounter.counter = 800
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