字符串從一個字符串截取到另外一個字符串：
web
NSString *webString=@"vwtrymaindocid/sajdhjaskd/fif/asdhasdja/";
spa
NSString *pageStart=@"fif";ci
NSString *pageEnd=@"$file";字符串
int startOffset=[webString rangeOfString:pageStart].location;string
int endOffset=[webString rangeOfString:pageEnd].location;it
//截取substringio
NSString *partialString=[webString substringWithRange:NSMakeRange(startOffset, endOffset-startOffset)];class
NSLog(@"\n b: %@",partialString);file
輸出爲：/sajdhjaskd/字符