IOS学习笔记之NSData NSDate NSString NSArray NSDictionary 相互转换

妖狐艹你老母 2022-08-21 03:30 167阅读 0赞

//    NSData  NSDate NSString NSArray NSDictionary json
        
        
        NSString *string = @"hello word";
        NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
        NSArray *array = [NSArray arrayWithObjects:@"1",@"2",@"3",nil];
        NSString *dateString = @"19891123";
        NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:
                             @"hello", @"word",
                             @"chen", @"lu",
                             @"jin", @"mei",
                             @"cerastes", @"hehe",nil];
    
    //    NSString to NSData
        NSData *string2data = [string dataUsingEncoding:NSUTF8StringEncoding];
        NSLog(@"%@",string2data);
    //    NSData to NSString
        NSString *data2String = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
        NSLog(@"dataString = %@",data2String);
        
    //    NSArray to NSData
        
        NSData *arry2data = [NSKeyedArchiver archivedDataWithRootObject:array];
    //    NSData to NSArray
        NSArray *data2arry = [NSKeyedUnarchiver unarchiveObjectWithData:arry2data];
        NSLog(@"%@  /n %@",arry2data,data2arry);
        
    //    NSString to NSDate
        NSDate *string2date = [self convertDateFromString:dateString withFormattre:@"yyyyMMdd"];
        NSLog(@"date = %@",string2date);
        
    //    NSDate to NSString
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        NSString *date2string = [dateFormatter stringFromDate:[NSDate date]];
        NSLog(@"%@", date2string);
        
    
    //   NSArray to NSString
        
        
        NSString *arry2String = [array componentsJoinedByString:@" "];
        
        NSLog(@"string = %@",arry2String);
        
        
    //    NSString to NSArray
        NSArray *string2Arry = [arry2String componentsSeparatedByString:@" "];
        NSLog(@" %@",string2Arry);
        
    
        
    //    NSDictionary to NSData:
        NSMutableData *dic2data = [[NSMutableData alloc] init];
        NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:dic2data];
        [archiver encodeObject:dic forKey:@"Some Key Value"];
        [archiver finishEncoding];
        NSLog(@"%@",dic2data);
        
    //    NSData to NSDictionary
        NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:dic2data];
        NSDictionary *data2dic = [unarchiver decodeObjectForKey:@"Some Key Value"];
        [unarchiver finishDecoding];
        NSLog(@"%@",data2dic);
        
        
    //    NSDictionary to NSString
        NSString *dic2string=[dic JSONRepresentation]; //这个方法是SBJson类库里的，需要导入SBJson.h
        NSLog(@"%@",dic2string);
        
    //    NSString to NSDictionary
        NSError *error = nil;
        NSDictionary *string2dic = [NSJSONSerialization JSONObjectWithData: [dic2string dataUsingEncoding:NSUTF8StringEncoding]
                                        options: NSJSONReadingMutableContainers
                                          error: &error];
        NSLog(@"%@",string2dic);