iphone – 在视图之间传递变量的最佳方法

Game_info.h

#import <UIKit/UIKit.h>

@interface Game_Info : UIViewController {
    IBOutlet UITextField *groupName;
    IBOutlet UISegmentedControl *gameType;

}

@property (nonatomic,retain) IBOutlet UITextField *groupName;


- (IBAction) GameTypePicker;
- (IBAction) KeyboardHide;
- (IBAction) BackBTN;
- (IBAction) NextBTN;

@end

Game_Info.m

#import "I_Dare_YouViewController.h"
#import "Game_Info.h"
#import "Game_TDoR.h"


    @implementation Game_Info
    @synthesize groupName;


// Next Button
-(IBAction) NextBTN{
    if ([groupName.text length] == 0) {
        // Alert
        UIAlertView *alert = [[UIAlertView alloc] 
                              initWithTitle:@"Group Name" 
                              message:@"Please enter a group name" 
                              delegate:self 
                              cancelButtonTitle:@"OK" 
                              otherButtonTitles:nil
                              ];
        [alert show];
        [alert release];
    }else if([groupName.text length] < 3){
        // Alert
        UIAlertView *alert = [[UIAlertView alloc] 
                              initWithTitle:@"Group Name" 
                              message:@"Please enter a name longer than 3 characters" 
                              delegate:self 
                              cancelButtonTitle:@"OK" 
                              otherButtonTitles:nil
                              ];
        [alert show];
        [alert release];
    }else{
        Game_TDoR *screen = [[Game_TDoR alloc] initWithNibName:nil bundle:nil];
        screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        [self presentModalViewController:screen animated:YES];
        [screen release];

        Game_TDoR *screen1 = [[Game_TDoR alloc] initWithNibName:nil bundle:nil];
        NSLog(@"Game_Info: %@",self.groupName.text);
        screen1.groupNameText = self.groupName.text; 
        [self presentModalViewController:screen1 animated:YES];
        [screen1 release];

    }
}

然后在另一个视图/ .h / .m文件中,我试图进入’groupName’属性.

Game_TDoR.m

#import "I_Dare_YouViewController.h"
#import "Game_Info.h"
#import "Game_TDoR.h"
@implementation Game_TDoR
@synthesize groupNameText,Testlbl;


- (void)viewDidLoad
{
    NSLog(@"Game_TDoR: %@",self.groupNameText);
    NSString *msg = [[NSString alloc] initWithFormat:@"Hello,%@",[self.groupNameText capitalizedString]];
    [Testlbl setText:msg];
    [msg release];

    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

所以我想要做的是在第一个视图页面(Game_info)上有一个输入文本框,我试图将其传递给另一个视图页面上的标签(Game_TDoR)

这是NSLog中出现的内容(注意第二页(Game_TDoR)在日志中首先出现.

2011-07-17 00:25:34.765 I Dare You[3941:207] Game_TDoR: (null)
2011-07-17 00:25:34.774 I Dare You[3941:207] Game_Info: Name

问题解决了：

在下一个按钮我需要在移动页面之前添加变量(而不是相反的方式 – 愚蠢的noobish事情要做…)

Game_TDoR *screen1 = [[Game_TDoR alloc] initWithNibName:nil bundle:nil];
        NSLog(@"Game_Info: %@",self.groupName.text);
        screen1.groupNameText = self.groupName.text; 
        [self presentModalViewController:screen1 animated:YES];
        [screen1 release];

        Game_TDoR *screen = [[Game_TDoR alloc] initWithNibName:nil bundle:nil];
        screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        [self presentModalViewController:screen animated:YES];
        [screen release];