IOS--NSString(字符串截取)

1.截取字符串

NSString*string [email protected]"sdfsfsfsAdfsdf";

string = [string substringToIndex:6];//截取下标6之后的字符串

NSLog(@"截取的值为：%@",string);

[string substringFromIndex:3];//截取下标3之前的字符串

NSLog(@"截取的值为：%@",string);

2.匹配字符串

NSString*string [email protected]"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 [email protected]"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. 替换方法

NSString *string = @"This is a const string";

NSString *string11 = [string stringByReplacingOccurrencesOfString:@"is" withString:@"are"];

这个将is全部替换，如何选择性替换is，比如第二个is