NSString ios

NSString

分隔:

NSString*string =@"sdfsfsfsAdfsdf";
NSArray *array = [string componentsSeparatedByString:@"A"]; //从字符A中分隔成2个元素的数组
NSLog(@"array:%@",array); //结果是adfsfsfs和dfsdf

替换:

NSString *str = [@"asdasd" stringByReplacingOccurrencesOfString:@"asd" withString:@"ok"];

截取前几位

NSString *str3 = [str substringWithRange:NSMakeRange(0, 3)];

//参考

http://my.oschina.net/iq19900204/blog/393588