将保存在plist中的NSNumber转换为整数

时间:2009-09-04 04:23:00

标签: ios objective-c plist nsnumber

保存数据:

- (NSString *)dataFilePath
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:kFilename];
}
- (void)applicationWillTerminate:(NSNotification *)notification
{
NSMutableArray *array = [[NSMutableArray alloc] init];

NSNumber *number = [NSNumber numberWithInt:points];
  [array addObject:number];

  [array writeToFile:[self dataFilePath] atomically:YES];
  [array release];
}

阅读数据: BestLabel.text将显示高分。我收到一个警告:“赋值从指针生成整数而没有强制转换”

-(void)LoadData{
BestLabel.center = CGPointMake(150,300);

NSString *filePath = [self dataFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath])
{
    NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:filePath];
    loadint = [array objectAtIndex:0];
    NSString *myString35 = [NSString stringWithFormat:@"%d", loadint]; 
    BestLabel.text = myString35;
    [array release];
}
}

我得到的示例代码是保存和加载文本字段没有问题。我想我可以做一个字符串到int转换,但这似乎是不必要的。谢谢你的帮助!

编辑:

- (void)applicationWillTerminate:(NSNotification *)notification

{     NSMutableArray * array = [[NSMutableArray alloc] init];

if (points > highscore){

    NSString *myString35 = [NSString stringWithFormat:@"%d", points];
    [array addObject:myString35];
}else {
    NSString *myString35 = [NSString stringWithFormat:@"%d", highscore];
    [array addObject:myString35];
}


NSNumber *number = [NSNumber numberWithInt:GreenBlot.center.x];
[array addObject:number];
NSNumber *number2 = [NSNumber numberWithInt:GreenBlot.center.y];
[array addObject:number2];

现在加载:

NSString *filePath = [self dataFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath])
{
    NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:filePath];
    BestLabel.text = [array objectAtIndex:0];
    highscore = [[array objectAtIndex:0] intValue];


    lx = [[array objectAtIndex:1] intValue];
    ly = [[array objectAtIndex:2] intValue];
    GreenBlot.center = CGPointMake( lx,ly);


    [array release];
}

lx和ly是整数。我首先尝试了CGPointMake([[array objectAtIndex:1] intValue],[[array objectAtIndex:2] intValue])。相同的结果,GreenBlot以0,0为中心。知道为什么吗?

3 个答案:

答案 0 :(得分:2)

最简单的方法是使用NSNumber的{​​{3}}方法:

loadint = [[array objectAtIndex:0] intValue];

答案 1 :(得分:1)

您需要以下第二行:

loadint = [array objectAtIndex:0];
int score = [loadint intValue];
NSString *myString35 = [NSString stringWithFormat:@"%d", loadint]; 

如果您只保存一个值,则使用带有键的NSDictionary,以便您更容易标记要保存的值。

答案 2 :(得分:0)

CGPointMake定义为:

CGPoint CGPointMake(
    float x,
    float y
)

你正在使用GreenBlot.center.x,它可能是一个浮点数并将它作为一个int提供给NSNumber ....返回并查看变量的类型并更改为[NSNumber numberWithFloat:...]和lx = [[array objectAtIndex:1] floatValue];等等。适当的。

此外,您在编辑原始问题时创建了一个不同的问题。