将 NSMutableArrays 保存到 pList

Question

我正在尝试将 NSMutableArray 存储到 pList 中，但是当我检查我的 data.pList 时，里面没有任何值。知道为什么吗？

-(void)run
{
Global *myGlobal = [Global sharedGlobal];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"data.plist"];

NSMutableDictionary *category = [[NSMutableDictionary alloc]init];
NSMutableDictionary *totalCategory = [[NSMutableDictionary alloc]init];
for (int i = 0 ; i < [myGlobal.categoryArray count];i++){
    Category * c = [categoryArray objectAtIndex:i];

    [category setObject:c.name forKey:@"category"];

    [totalCategory setObject:category forKey:@"allCategory"];

    NSMutableDictionary *stock = [NSMutableDictionary dictionaryWithContentsOfFile:path];
    [stock writeToFile:path atomically:YES];
}
if( totalCategory==nil ){
    NSLog(@"failed to retrieve dictionary from disk");
}
}

Answer 1

这两行没有意义。第一行将字典从path 读入stock，第二行将其写回。 stock 没有添加任何内容。

NSMutableDictionary *stock = [NSMutableDictionary dictionaryWithContentsOfFile:path];
[stock writeToFile:path atomically:YES];

Answer 2

当保存到 pList 时，你应该试着把它变成这样。

[totalCategory writeToFile:path atomically:YES];

这是一个如何正常工作的示例

+ (void) saveParams:(int)kotuc 一:(NSNumber*)一二:(NSNumber*)二三:(NSNumber*)三四:(NSNumber*)四五:(NSNumber*)五六:(NSNumber* )六七:(NSNumber*)七八:(NSArray*)八{ NSString *path = [self getNSPath]; NSDictionary* dw = [[NSDictionary alloc] initWithContentsOfFile:path]; NSMutableDictionary* dict = [[NSMutableDictionary alloc] init]; NSArray *keys = [[NSArray arrayWithObjects:@"one", @"two", @"three", @"four", @"five", @"six",@"seven", @"eight",nil ] 保持]; NSArray *objects = [[NSArray arrayWithObjects:一、二、三、四、五、六、七、八、无] 保留]; NSMutableDictionary *subDict = [[NSMutableDictionary alloc] initWithObjects:(NSArray *)objects forKeys:(NSArray *)keys]; ////保存旧的 [字典集字典：dw]； ////保存新的 [dict setObject:subDict forKey:[NSString stringWithFormat:@"%i", kotuc]]; // //写入文件 [dict writeToFile:path atomically:YES]; [dw发布]; [字典发布]； [子目录发布]； [按键释放]； [对象释放]； }