iOS之字符串处理:截取字符串、匹配字符串、分隔字符串

1、字符串的截取

//1.截取字符串

NSString *string =@"123456d890";
NSString *str1 = [string substringToIndex:5];//截取掉下标5之前的字符串
NSLog(@"截取的值为：%@",str1);
 NSString *str2 = [string substringFromIndex:3];//截取掉下标3之后的字符串
NSLog(@"截取的值为：%@",str2);

2、匹配字符串

从字符串(sd是sfsfsAdfsdf)中查找(匹配)字符串(Ad)

//2.匹配字符串
NSString *string =@"sd是sfsfsAdfsdf";
NSRange range = [string rangeOfString:@"Ad"];//匹配得到的下标
NSLog(@"rang:%@",NSStringFromRange(range));
string = [string substringWithRange:range];//截取范围内的字符串
NSLog(@"截取的值为：%@",string);

3、字符串分割

根据字符串中的某个字符(A)来分割字符串

//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