子窗口
// header file
@property (nonatomic, copy) NSString *example;
// .m file
@synthesize example;
父窗口
// when you create the object
NewItemController *item = [[NewItemController alloc] init];
item.example = @"example string data";
子窗口
// header file
@property (nonatomic, copy) NSString *example;
// .m file
@synthesize example;
父窗口
// when you create the object
NewItemController *item = [[NewItemController alloc] init];
item.example = @"example string data";