Question

在我的应用程序的开始屏幕中，您可以通过单击英国或瑞典的旗帜来选择英语和瑞典语之间的语言。问题是当您单击按钮时，ViewDidLoad无法识别NSUserDefaults中的更改。但是当您重新启动应用程序时，语言是您单击的最新标志！因此它保存了NSUserDefault，但它只在ViewDidLoad中第一次加载..

单击英文标记时，sprakval设置为0，如果单击瑞典标志，则sprakval设置为1.当您单击标记时，它将更改为标记前面带有刻度图标的图像。 / p>

代码：

-(IBAction) sprakEN
 {
    sprakval=0;
    NSUserDefaults *sprakvalet = [NSUserDefaults standardUserDefaults];
    [sprakvalet setInteger:sprakval  forKey:@"Sprak "];
    [sprakvalet synchronize];

    [super viewDidLoad];
}



-(IBAction) sprakSE
 {
     sprakval=1;
     NSUserDefaults *sprakvalet = [NSUserDefaults standardUserDefaults];
     [sprakvalet setInteger:sprakval  forKey:@"Sprak "];
     [sprakvalet synchronize];

      [super viewDidLoad];
 }

  - (void)viewDidLoad
    {
        [super viewDidLoad];

        NSUserDefaults *sprakvalet = [NSUserDefaults standardUserDefaults];
        sprakval2  = [sprakvalet integerForKey:@"Sprak "];

        if (sprakval2==0)
        {
            spraklabel.text = [NSString stringWithFormat:@"Language:"];

            [lhb setTitle:@"english" forState:UIControlStateNormal];
            [hlb setTitle:@"english" forState:UIControlStateNormal];
            [fhb setTitle:@"english." forState:UIControlStateNormal];
            [blandatb setTitle:@"english.." forState:UIControlStateNormal];

            UIImage *encheck = [UIImage imageNamed:@"United_Kingdomchecked.png"];
            [enbutton setImage:encheck forState:UIControlStateNormal];

            UIImage *seuncheck = [UIImage imageNamed:@"Sweden.png"];
            [sebutton setImage:seuncheck forState:UIControlStateNormal];

            self.title = @"Game";
        }
        else if(sprakval2==1)
        {
            spraklabel.text = [NSString stringWithFormat:@"Språk:"];

            [lhb setTitle:@"swedish" forState:UIControlStateNormal];
            [hlb setTitle:@"swedish" forState:UIControlStateNormal];
            [flb setTitle:@"swedish" forState:UIControlStateNormal];
            [fhb setTitle:@"swedish" forState:UIControlStateNormal];
            [blandatb setTitle:@"swedish" forState:UIControlStateNormal];

            self.title = @"Spel";
            UIImage *secheck = [UIImage imageNamed:@"Swedenchecked.png"];
            [sebutton setImage:secheck forState:UIControlStateNormal];

            UIImage *enuncheck = [UIImage imageNamed:@"United_Kingdom.png"];
            [enbutton setImage:enuncheck forState:UIControlStateNormal];
        }

    // Do any additional setup after loading the view, typically from a nib.
     }

Answer 1

viewDidLoad是从nib文件加载视图后调用的方法。你不应该手动调用它。

如果您已编写代码来刷新viewDidLoad中的控件，请将其移入另一个方法并从按钮事件处理程序中调用该方法。

- (void)adjustControlsForLanguage
{
    NSUserDefaults *sprakvalet = [NSUserDefaults standardUserDefaults];
    sprakval2  = [sprakvalet integerForKey:@"Sprak "];

    if (sprakval2==0)
    {
        spraklabel.text = [NSString stringWithFormat:@"Language:"];

        [lhb setTitle:@"english" forState:UIControlStateNormal];
        [hlb setTitle:@"english" forState:UIControlStateNormal];
        [fhb setTitle:@"english." forState:UIControlStateNormal];
        [blandatb setTitle:@"english.." forState:UIControlStateNormal];

        UIImage *encheck = [UIImage imageNamed:@"United_Kingdomchecked.png"];
        [enbutton setImage:encheck forState:UIControlStateNormal];

        UIImage *seuncheck = [UIImage imageNamed:@"Sweden.png"];
        [sebutton setImage:seuncheck forState:UIControlStateNormal];

        self.title = @"Game";
    }
    else if(sprakval2==1)
    {
        spraklabel.text = [NSString stringWithFormat:@"Språk:"];

        [lhb setTitle:@"swedish" forState:UIControlStateNormal];
        [hlb setTitle:@"swedish" forState:UIControlStateNormal];
        [flb setTitle:@"swedish" forState:UIControlStateNormal];
        [fhb setTitle:@"swedish" forState:UIControlStateNormal];
        [blandatb setTitle:@"swedish" forState:UIControlStateNormal];

        self.title = @"Spel";
        UIImage *secheck = [UIImage imageNamed:@"Swedenchecked.png"];
        [sebutton setImage:secheck forState:UIControlStateNormal];

        UIImage *enuncheck = [UIImage imageNamed:@"United_Kingdom.png"];
        [enbutton setImage:enuncheck forState:UIControlStateNormal];
    }

}

viewDidLoad中

- (void)viewDidLoad{
    [super viewDidLoad];
    [self adjustControlsForLanguage];
}

按钮事件处理程序

-(IBAction) sprakEN {
    sprakval=0;
    NSUserDefaults *sprakvalet = [NSUserDefaults standardUserDefaults];
    [sprakvalet setInteger:sprakval  forKey:@"Sprak "];
    [sprakvalet synchronize];

    [self adjustControlsForLanguage];
}

-(IBAction) sprakSE {
     sprakval=1;
     NSUserDefaults *sprakvalet = [NSUserDefaults standardUserDefaults];
     [sprakvalet setInteger:sprakval  forKey:@"Sprak "];
     [sprakvalet synchronize];

      [self adjustControlsForLanguage];
 }

编辑：由于您使用的是基于tabBar的应用程序，最好使用viewWillAppear重新加载特定于语言的控件

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self adjustControlsForLanguage];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
}

Answer 2

这是因为您通过-(IBAction) sprakSE和-(IBAction) sprakEN方法中的超类调用ViewDidload方法。因此，请在两种方法中将[super viewDidLoad];替换为[self viewDidLoad];。它会正常工作。

希望它对你有所帮助。

从ViewDidLoad中的NSUserDefaults加载数据

2 个答案: