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);
