ios - 如何正确地从一个字符串中取出一个字符串？

Question

我有一个 NSString 看起来像这样 "ALAssetsGroup - Name:Hej - ProgCam, Type:Album, Assets count:0" 我想“提取”名称“Hej”。我试着这样做:

NSString *sStr = [NSString stringWithFormat:@"%@", assetGroups[indexPath.row]];
NSRange range1 = [sStr rangeOfString:@"Name: "];
NSRange range2 = [sStr rangeOfString:@" - ProgCam"];
NSRange rRange = {range1.location + range1.length, range2.location};
NSString *rStr = [sStr substringWithRange:rRange];
cell.cellLabel.text = [NSString stringWithFormat:@"%@", rStr];

但是我得到这个错误:

*** Terminating app due to uncaught exception 'NSRangeException', reason: 
'-[__NSCFString substringWithRange:]: Range or index out of bounds'

我在这里做错了什么？

Answer 1

您必须从 range2.location 中减去 range1.location + range1.length:

NSInteger start = range1.location + range1.length;
NSRange rRange = {start, range2.location - start};