IOS 字符串处理：截取字符串、匹配字符串、分隔字符串

1.截取字符串

NSString*string =@"sdfsfsfsAdfsdf";

string = [string substringToIndex:7];//截取掉下标7之后的字符串

NSLog(@"截取的值为：%@",string);

[string substringFromIndex:2];//截取掉下标2之前的字符串

NSLog(@"截取的值为：%@",string);

2.匹配字符串

NSString*string =@"sdfsfsfsAdfsdf";

NSRangerange = [stringrangeOfString:@"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

4. //截取方法

NSString*str6 =@"www.tedu.cn";

NSString*str7 = [str6substringToIndex:3];//截取头

NSLog(@"%@", str7);

NSString*str8 = [str6substringFromIndex:9];//截取尾

NSLog(@"%@", str8);

NSString*str9 = [str6substringWithRange:NSMakeRange(4,4)];

NSLog(@"%@", str9);

//拼接方法

NSString*str10 =@"Hello ";

NSString*str11 =@"world!";

NSString*str12 = [[NSStringalloc]initWithFormat:@"%@%@", str10, str11];//初始化拼接

NSLog(@"%@", str12);

NSString*str13 = [str10stringByAppendingString:str11];//追加拼接

NSLog(@"%@", str13);

NSString*str14 = [str10stringByAppendingFormat:@"%@,%d", str11, a];//格式化拼接

NSLog(@"%@", str14);

//替换方法

NSString*str15 =@"www.tarena.com.cn";

NSString*str16 = [str15stringByReplacingCharactersInRange:NSMakeRange(4,10)withString:@"tedu"];

NSLog(@"%@", str16);