property not initialized at super.init call
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class EquilateralTriangle: NamedShape {
var sideLength: Double = 0.0
var numberOfSides: Int
init(sideLength: Double, name: String) {
self.sideLength = sideLength
super.init(name: name)
self.numberOfSides = 3
}
var sideLength: Double = 0.0
var numberOfSides: Int
init(sideLength: Double, name: String) {
self.sideLength = sideLength
super.init(name: name)
self.numberOfSides = 3
}
}
非 Optional 属性,都必须在构造函数中设置初始值,从而保证对象在被实例化的时候,属性都被正确初始化
在调用父类构造函数之前,必须保证本类的属性都已经完成初始化
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