substringFromIndex、substringWithRange、substringToIndex

最新推荐文章于 2022-04-22 17:01:38 发布

原创最新推荐文章于 2022-04-22 17:01:38 发布 · 582 阅读

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本文详细介绍了在Objective-C中使用NSString进行子串提取的方法及注意事项，包括从指定位置开始和结束的子串提取，以及通过NSRange指定范围的子串提取。

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NSString *str = @"12345";

NSString *subString0 = [str substringFromIndex:-1];   //会放生越界错误
NSString *subString1 = [str substringFromIndex:0];    //12345
NSString *subString2 = [str substringFromIndex:1];    //2345
NSString *subString3 = [str substringFromIndex:4];    //5
NSString *subString4 = [str substringFromIndex:5];   //
NSString *subString5 = [str substringFromIndex:6];   //会放生越界错误

NSString *subString10 = [str substringToIndex:-1];    //会放生越界错误
NSString *subString11 = [str substringToIndex:0];         //
NSString *subString12 = [str substringToIndex:1];         //1
NSString *subString13 = [str substringToIndex:4];         //1234
NSString *subString14 = [str substringToIndex:5];         //12345
NSString *subString15 = [str substringToIndex:6];     //会放生越界错误

NSRange range1 = NSMakeRange(-1, 5);
NSRange range2 = NSMakeRange(0, 6);
NSRange range3 = NSMakeRange(0, 5);
NSRange range4 = NSMakeRange(1, 4);
NSRange range5 = NSMakeRange(0, 0);
NSRange range6 = NSMakeRange(4, 1);

NSString *subString31 = [str substringWithRange:range1]; //会放生越界错误
NSString *subString32 = [str substringWithRange:range2]; //会放生越界错误
NSString *subString33 = [str substringWithRange:range3];   //12345
NSString *subString34 = [str substringWithRange:range4];   //2345
NSString *subString35 = [str substringWithRange:range5];   //
NSString *subString36 = [str substringWithRange:range6];   //5