从ViewDidLoad中的NSUserDefaults加载数据

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标志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，语言是您点击的最新标志！因此它保存了NSUserDefault，但它只在ViewDidLoad中第一次加载它。

当您单击英语国旗时，sprakval设置为0，并且如果单击瑞典国旗，sprakval将设置为1.单击标志，它将更改为标志前方带有刻度图标的图像。

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

这是因为您在-(IBAction) sprakSE 和-(IBAction) sprakEN 方法中通过其超类调用ViewDidload方法。因此在两种方法中用 [self viewDidLoad];代替 [super viewDidLoad];。它会正常工作。

希望它可以帮助你。

Answer 2

viewDidLoad中是视图已经从笔尖文件加载之后调用的方法。你不应该手动调用它。

如果您已经编写了代码来刷新viewDidLoad中的控件，将其移入其他方法并从您的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

-(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的TabBar的应用程序，这是更好地使用viewWillAppear中重新加载特定语言的控制

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

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