swift guard关键字详解及使用

Swift提供guard关键字，guard关键字可以简化繁琐的判断逻辑

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 func buy( money: Int , price: Int , capacity: Int , volume: Int){ if money >= price{ if capacity >= volume{ print("I can buy it!") print("\(money-price) Yuan left.") print("\(capacity-volume) cubic meters left") } else{ print("No enough capacity") } } else{ print("Not enough money") } }

以上代码用guard关键字简化代码风格

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 func buy2( money: Int , price: Int , capacity: Int , volume: Int){ guard money >= price else{ print("Not enough money") return } guard capacity >= volume else{ print("Not enough capacity") return } print("\(money-price) Yuan left.") print("\(capacity-volume) cubic meters left") }

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原文链接：http://blog.csdn.net/u012903898/article/details/52834391