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深入了解 iOS 的初始化
source link: https://juejin.im/post/5dd24e3ff265da0bbc3067ae
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初始化 在 iOS 里面，无论是 Objective-C 还是 Swift，类（结构体、枚举）的初始化都有一定的规则要求，只不过在 Objective-C 中会比较宽松，如果不按照规则也不会报错，但会存在隐患，而在 Swift 则需要严格按照规则要求代码才能编
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