ios - 如何在xcode中观察变量值随时间的变化

Question

我目前正在使用 swift 学习 ios 开发，我只是想知道 xcode 中是否有办法

1) 每当变量的值改变时在变量上设置断点

或

2) 以某种方式跟踪变量值随时间的变化

Answer 1

Swift didSet 和 willSet 方法

您可以在控制台中使用打印:

class Observable {
    static var someProperty: String? {
        willSet {
            print("Some property will be set.")
        }
        didSet {
            print("Some property has been set.")
        }
    }
}

带观察点的方法

Watchpoints are a tool you can use to monitor the value of a variable or memory address for changes and trigger a pause in the debugger when changes happen. They can be very helpful in identifying problems with the state of your program that you might not know precisely how to track down.

您可以找到很棒的指南 here