Objective-C 데이터 유형 변환

1. NSDictionary에서 NSData로 전환[상호 변환]

NSDictionary *dic= @{@"name":@"macRong",@"webHome":@"eqi.cc"}; 
NSData *data= [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil]; 
NSDictionary *dictionary =[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
 NSLog(@"NSDictionary NSData= %@",data); 
NSLog(@"NSData NSDictionary=%@",dictionary);

2. NSDictionary에서 NSString으로 전환(NSDictionary에서 NSData로 전환한 다음 NSString으로 전환해야 함)

NSDictionary *dictionary2 = [NSDictionary dictionaryWithObjectsAndKeys:_userNameTexField.text,@"AAccount", _pwdTextField.text,@"APassword",@"1",@"DeviceType",nil]; 
NSData *data = [NSJSONSerialization dataWithJSONObject:dictionary2 options:NSJSONWritingPrettyPrinted error:nil]; 
NSString *strhh = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

3. NSData 및 NSString 상호 변환

//  Data
NSString *str =@"jesfds"; 
NSData *data =[str dataUsingEncoding:NSUTF8StringEncoding];
//NSData  NSString
NSString *result  =[[ NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

4. 문자열에 문자열이 포함된 것으로 판단

// userNameLab.text  bendan
if([userNameLab.text rangeOfString:@"bendan"].location !=NSNotFound)//userNameLab
{
       NSLog(@"yes");
}else {
     NSLog(@"no");
}

5. UIImage 및 NSData

//NSData UIImage  
NSData *imageData = [NSData dataWithContentsOfFile: imagePath];  
UIImage *image = [UIImage imageWithData: imageData];  
 
//UIImage NSData  
NSData *imageData = UIImagePNGRepresentation(aimae);

6.Int 및 NSNumber

//int  NSNumber
int myInt；
NSNumber *myNumber = [NSNumber numberWithInt:myInt];
//NSNumber  int
int myInt = [myNumber intValue];

7.int 회전string

int number = 100;
NSString *string = [[NSString alloc] initWithFormat:@"%d",number];