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NSData NSDate NSString NSArray NSDictionary 相互转换

NSData NSDate NSString NSArray NSDictionary 相互转换

//    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);