Property observers in Swift
Forums:
class Cash {
var sum: Double = 0.0 {
willSet {
print("cash sum: \(newValue)")
}
didSet {
print("adds: \(sum - oldValue)")
}
}
}
let cash = Cash()
cash.sum = 100
cash.sum *= 3
//output:
//cash sum: 100.0
//adds: 100.0
//cash sum: 300.0
//adds: 200.0
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