在视图之间传递变量的最佳方法 [英] Best way to pass variables between views

问题描述

我对xcode& Objective-C（来自PHP）我已经开始玩了，我发现很难在视图之间传递变量这是我到目前为止：

I am very new to xcode & Objective-C (having come from PHP) i have started to play around and am finding it very hard to pass variables between views this is what i have so far:

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中/ .m文件我试图进入'groupName'属性。

Then in another view / .h / .m file i am trying to get to the 'groupName' property.

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.
}

所以我想做的是在第一个视图页面（Game_info）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）

So what i am trying to do is on the first view page (Game_info) there is an input text box and im trying to pass that to a label on another view page (Game_TDoR)

这是NSLog中出现的内容（注意第二个）页面（Game_TDoR）在日志中首先出现。

This is what comes out in the NSLog (note that the second page (Game_TDoR) comes out first in the log.

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：

在下一个按钮上我需要在移动页面之前添加变量（不是相反的方式） - 愚蠢的noobish做的事情......）

On the next button i needed to add the variable before i moved page (not the other way around - silly noobish thing to do...)

        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];

推荐答案

如果你需要传递<$ c的值$ c> groupName.text 从 Game_Info 视图控制器到 Game_TDoR 视图控制器，由前者以模态方式呈现，您可以在 Game_TDoR 中声明一个属性来保存该值：

If you need to pass the value of groupName.text from the Game_Info view controller to the Game_TDoR view controller, which is presented modally by the former, you can declare a property in Game_TDoR to hold the value:

1）在 Game_TDoR @interface块中声明 NSString 属性：

1) Declare a NSString property in Game_TDoR @interface block:

@property (nonatomic,copy) NSString *groupNameText;

（请记住在实现块中综合或实现访问器方法）

(Remember to synthesize or implement the accessor methods in the implementation block)

2）在 NextBTN 操作中，初始化 Game_TDoR 实例后，设置属性：

2) In NextBTN action, after you initialize your Game_TDoR instance, set the property:

Game_TDoR *screen = [[Game_TDoR alloc] init...];
screen.groupNameText = self.groupName.text;

这篇关于在视图之间传递变量的最佳方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！