ios开发之--NSString的操作

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dfsdf1.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);

4.分隔字符串，字符串分割成数组

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

5，数组转成字符串

NSArray *array = @[@"a",@"b",@"c",@"d",@"e",@"f"];
NSString *string = [array componentsJoinedByString:@","];,为分隔符

6，过滤字符串，过滤所有非字符符号

NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"[]{}（#%-*+=_）\\|~(＜＞$%^&*)_+ "];
NSString * hmutStr = [[mutStr componentsSeparatedByCharactersInSet: doNotWant]componentsJoinedByString: @""];

NSLog(@"humStr is %@",hmutStr);

return hmutStr;

仅做记录！如有不妥之处，请大家不吝指教！