Question

我创建了一个简单的应用程序，它包含2个UILabel和一个按钮，用于将两者的值相加。我在退出应用程序/按下后退按钮/应用程序崩溃等时使用NSUserdefaults来保存标签的值。我在选择将两个值一起添加的按钮时调用此保存功能。

我遇到的问题是只保存了1个UILabel值，而另一个则没有。我已经尝试了各种各样的调整，但无法深入了解它。

这是我的h文件代码：

#import <UIKit/UIKit.h>

int dcounter;
int dtotaler;
int enteramount;

@interface durood : UIViewController {

    IBOutlet UILabel *dcount;
    IBOutlet UILabel *dtotal;
    IBOutlet UITextField *numberTextField;

}

-(IBAction)addtotal1;

以下是我的m文件中的代码：

-(IBAction)addtotal1;{

    float x = ([dcount.text floatValue]);
    float y = ([dtotal.text floatValue]);
    [dtotal setText:[NSString stringWithFormat:@"%g", x + y]];
    dcounter=0;
    dcount.text = [NSString stringWithFormat:@"%i",dcounter];
    NSUserDefaults *userDefaults=[NSUserDefaults standardUserDefaults];
    [userDefaults setObject:[NSString stringWithFormat:@"%i",dtotaler] forKey:@"saveDtotal"];
    [userDefaults setObject:[NSString stringWithFormat:@"%d",dcounter] forKey:@"saveDcount"];
    [userDefaults synchronize];

-(void)saveDcount
{
    NSUserDefaults *userDefaults=[NSUserDefaults standardUserDefaults];
    [userDefaults setObject:[NSString stringWithFormat:@"%d",dcounter] forKey:@"saveDcount"];
    [userDefaults setObject:[NSString stringWithFormat:@"%d",dtotaler] forKey:@"saveDtotal"];
    [userDefaults synchronize];

}

- (void)viewDidLoad
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(saveDcount) name:UIApplicationDidEnterBackgroundNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(saveDcount) name:UIApplicationWillTerminateNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(saveDtotal) name:UIApplicationDidEnterBackgroundNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(saveDtotal)   name:UIApplicationWillTerminateNotification object:nil];



    NSUserDefaults *userDefaults=[NSUserDefaults standardUserDefaults];
    NSString *dcountString= [userDefaults objectForKey:@"saveDcount"];
    NSLog(@"Your Dcount: %@",dcount);
    NSString *dtotalString= [userDefaults objectForKey:@"saveDtotal"];
    NSLog(@"Your Dtotal: %@",dtotal);

    //checking if data in user defaults is not empty
    if(dcountString.length>0)
    {
        dcounter=[dcountString intValue];
        dcount.text = [NSString stringWithFormat:@"%d",dcounter];

    }
    else
    {
        //for first time
        dcounter=0;
        dcount.text=@"0";
    }

    if(dtotalString.length>0)
    {
        dtotaler=[dtotalString intValue];
        dtotal.text = [NSString stringWithFormat:@"%d",dtotaler];
    }
    else
    {
        //for first time
        dtotaler=0;
        dtotal.text=@"0";
    }
}

未保存的UILabel /字符串是'dtotal'。

非常感谢任何帮助。感谢。

Answer 1

我找到了解决方法。

-(IBAction)addtotal1;{

float x = ([dcount.text floatValue]);
float y = ([dtotal.text floatValue]);
dtotaler = x + y;
dtotal.text = [NSString stringWithFormat:@"%d",dtotaler];
dcounter=0;
dcount.text = [NSString stringWithFormat:@"%i",dcounter];
NSUserDefaults *userDefaults=[NSUserDefaults standardUserDefaults];
[userDefaults setObject:[NSString stringWithFormat:@"%d",dtotaler] forKey:@"saveDtotal"];
[userDefaults setObject:[NSString stringWithFormat:@"%d",dcounter] forKey:@"saveDcount"];
[userDefaults synchronize];

感谢大家的投入。

只保存一个UILabel值

1 个答案: