因此,我尝试在nsstring中搜索一个名为rangeFromString的术语,但是只要没有与该结果匹配的内容,我都会得到2748601949而不是0的信息。例如,尝试定位@“ sin (“,@” cos(“和@” tan(“以@” 1 + sin(28)+ cos(72)“之类的字符串表示。谢谢
它返回NSNotFound
,它在NSObjCRuntime.h
定义如下:
enum {NSNotFound = NSIntegerMax};
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