基础的字符串操作

1.截取字符串

NSString *string =@"sdfsfsfsAdfsdf";
string = [string substringToIndex:7];//截取掉下标7之前的字符串
NSLog(@"截取的值为：%@",string);
string =[string substringFromIndex:2];//截取掉下标2之后的字符串
NSLog(@"截取的值为：%@",string);

2.匹配字符串

NSString *string =@"sdfsfsfsAdfsdf";
NSRange range = [string rangeOfString:@"f"];//匹配得到的下标NSLog(@"rang:%@",NSStringFromRange(range));
string = [string substringWithRange:range];//截取范围类的字符串
NSLog(@"截取的值为：%@",string);

3.分隔字符串

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