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当应用程序进入前台时，我想更改视图控制器中的标签....：

SalaryAppV4AppDelegate.h

@interface SalaryAppV4AppDelegate : NSObject {

//---------------------------------------------------------- 

NSTimeInterval appEnteredBackground;

NSTimeInterval appEnteredForeground;

NSTimeInterval difference;

NSString *times;

//------------------------------------------------

SalaryAppV4AppDelegate.m

  • (void)applicationWillEnterForeground:(UIApplication *)application

{

//perform -(IBAction)DoThis

FirstViewController* controller = [FirstViewController alloc];
[controller DoThis]; 




//releasing
[dateFormatter release];

}

//------------------------------------------------ ---------------------

第一视图控制器.h

导入 UIKit/UIKit.h> 导入“SalaryAppV4AppDelegate.h”

@interface FirstViewController : UIViewController {

IBOutlet UITextField *text1;
IBOutlet UILabel *label;
IBOutlet UILabel *labeltotal;
IBOutlet UILabel *differenceLabel;


int i;
float number1;
NSTimer *timer;

SalaryAppV4AppDelegate *appDelegate;

}

//动作

-（IBAction）重置：（id）发件人；

-(IBAction)backgroundTouched:(id)sender;

-（IBAction）开始计时器；

-（无效）这样做；

//特性

@结尾

//------------------------------------------------ --------------------

第一视图控制器.m

-（IBAction）这样做{

appDelegate = [[[UIApplication sharedApplication] delegate] retain];

//This Doesn't Work :(
label.text = @"IT Has Worked";


//This Works
NSLog(@"%@", appDelegate.times);

}

//------------------------------------------------ --------

我只想将 label.text ti 更改为任何内容，但 viewcontroller 中没有任何更改...

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