Question

基本上我试图这样做，当我重新启动应用程序时，用户的分数被保存，目前，在关闭并重新打开应用程序时，分数会恢复为零。我在互联网上寻找了很多解决方案但却一无所获。这是我的代码（ViewController.m）：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

int bytes;
int highScore;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    highScore = bytes;

    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:highScore] forKey:@"HighScore"];
    [[NSUserDefaults standardUserDefaults] synchronize];


    // Snippet used to get your highscore from the prefs.
    highScore = [[[NSUserDefaults standardUserDefaults] objectForKey:@"HighScore"] intValue ];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)addBytes:(id)sender {
    highScore = [[[NSUserDefaults standardUserDefaults] objectForKey:@"HighScore"] intValue ];
    highScore++;
    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:highScore] forKey:@"HighScore"];
    [_byteCounter setText:[NSString stringWithFormat:@"%d", highScore]];

}

@end

Answer 1

你可以使用这段代码，我希望能为你工作：

[[NSUserDefaults standardUserDefaults] setInteger：HighScore forKey：@“HighScore”];

Answer 2

用户默认值未更新，因为您没有更新它。

highscore ++只增加你的int变量，它不会增加NSUserDefaults中的值。因此，在更新高分后，您仍需要通过调用：

来更新NSUserDefaults

[[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:highScore] forKey:@"HighScore"];

此外，您不需要也不应该调用同步。稍后将自动将数据刷新到磁盘上。

Answer 3

启动时，我没有将保存的值从NSUserDefaults显示到标签，这是我更新的代码，它会在重新启动应用程序时保存整数。（我为自己感到骄傲！）

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

int bytes;
int highScore;

- (void)viewDidLoad {
    [super viewDidLoad];

    highScore = bytes;

    highScore = [[[NSUserDefaults standardUserDefaults] objectForKey:@"HighScore"] intValue ];
    [_byteCounter setText:[NSString stringWithFormat:@"%d", highScore]];

    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:highScore] forKey:@"HighScore"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

- (IBAction)addBytes:(id)sender {
    highScore = [[[NSUserDefaults standardUserDefaults] objectForKey:@"HighScore"] intValue ];
    highScore++;
    [_byteCounter setText:[NSString stringWithFormat:@"%d", highScore]];
    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:highScore] forKey:@"HighScore"];
}

@end

无法使用NSUserDefaults保存整数

3 个答案: