IPHONE开发 在VIEW之间传递参数

//MovieViewController.h: MovieViewController为现视图，MovieDetailViewController为要切换的子视图，在现视图中定义切换视图的句柄
@property (strong, nonatomic) MovieDetailViewController *childController;

//MovieDetailViewController.h: 在要切换的子视图中定义两个变量
@property (weak, nonatomic) IBOutlet UILabel *detailLabel;

@property (copy, nonatomic) NSString *message;
//MovieViewController.m
if (childController == nil) {
childController = [[MovieDetailViewController alloc]
initWithNibName:@"MovieDetailViewController" bundle:nil];
}
NSUInteger row = [indexPath row];
NSString *selectedMovie = [movieList objectAtIndex:row];
NSString *detailMessage = [[NSString alloc]
initWithFormat:@"你选择了电影：%@.", selectedMovie];

//在现视图中传递变量值给子视图，并切换到子视图
childController.message = detailMessage;
childController.title = selectedMovie;
[self.navigationController pushViewController:childController animated:YES];