具有OR条件的Objective-C IF语句 [英] Objective-C IF statement with OR condition

问题描述

这个IF语句出了什么问题？

What's wrong in this IF statement?

if ([currentElement isEqualToString:@"aaa" || currentElement isEqualToString:@"bbb"])

XCode说：

No visible @interface for 'NSString' declares the selector 'isEqualToString:isEqualToString:'

如果它可以帮助我进入NSXML Parser程序，但我认为这不是问题所在。

I'm into an NSXML Parser procedure if it can help, but I think it's not that the problem.

推荐答案

您必须比较两个方法调用的结果：

You must compare result of two method calls:

if ([currentElement isEqualToString:@"aaa"] || [currentElement isEqualToString:@"bbb"])

您实际编译的代码为

if ([currentElement isEqualToString:(@"aaa"||currentElement) isEqualToString:@"bbb"])

编译器尝试调用不存在的 isEqualToString：isEqualToString：方法的NSString

that is compiler tries to call non-existing isEqualToString:isEqualToString: method of NSString

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