Iphone 如何将NSUserDefault值调用到另一个视图控制器?
//我在单独的类文件中编写了此函数:Iphone 如何将NSUserDefault值调用到另一个视图控制器?,iphone,ios,cocoa-touch,ios-simulator,Iphone,Ios,Cocoa Touch,Ios Simulator,//我在单独的类文件中编写了此函数: -(void)Display { NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; NSInteger *Position = [prefs integerForKey:@"currentlevel"]; NSLog(@"------->%i",Position); //This NSLog is returning Value 6
-(void)Display
{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSInteger *Position = [prefs integerForKey:@"currentlevel"];
NSLog(@"------->%i",Position);
//This NSLog is returning Value 6
[prefs synchronize];
}
//在我的viewController
中,我使用为类创建的对象调用此函数
@interface ViewController ()
{
//display My class name
//disp is object fro my class
display *disp;
}
@implementation ViewController
- (void)viewDidLoad
{
disp = [[display alloc]init];
[disp Display];
NSLog(@"%i",[disp Position]);
//this NSLog statement returning value 0
[super viewDidLoad];
}
如果有人有任何解决方案,请帮助我。试着像这样实施
@implementation ClassA
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[[NSUserDefaults standardUserDefaults]setInteger:100 forKey:@"currentlevel"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
@end
@implementation ClassB
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
int B = [[[NSUserDefaults standardUserDefaults] integerForKey:@"currentlevel"] integerValue];
NSLog(@"Interger Value %d",b);
}
为什么不从视图控制器本身的NSUserDefaults中获取值?像这样:
-(void) viewDidLoad
{
[super viewDidLoad];
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSInteger *Position = [prefs integerForKey:@"currentlevel"];
NSLog(@"------->%i",Position);
}
如果要设置整数值,请使用以下语句:
[[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:highScore] forKey:@"kHighScore"];
NSInteger highScore = [[[NSUserDefaults standardUserDefaults] objectForKey:@"kHighScore"] intValue];
如果要获取该值,请使用以下语句:
[[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:highScore] forKey:@"kHighScore"];
NSInteger highScore = [[[NSUserDefaults standardUserDefaults] objectForKey:@"kHighScore"] intValue];
您应该仅为其类方法创建一个实用程序类。你所做的在很多方面都是错误的。
位置是什么?它是局部变量吗?财产?一种方法?什么的解决方案?我看没有问题。我确实看到您没有显示方法Position
的代码,这对于理解您的代码非常重要。@Amar Position是我的全局变量属性,我在实现文件中合成了它。谢谢您的解决方案!我想放弃MVC模式,所以我创建了单独的类