如何测试Objective-C中的字符串是否为空? [英] How do I test if a string is empty in Objective-C?

问题描述

如何测试Objective-C中NSString是否为空?

How do I test if an NSString is empty in Objective-C?

推荐答案

您可以检查[string length] == 0.这将检查它是否是有效但为空的字符串(@")以及是否为nil，因为在nil上调用length也会返回0.

You can check if [string length] == 0. This will check if it's a valid but empty string (@"") as well as if it's nil, since calling length on nil will also return 0.

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