Question

我正在使用此代码将内容添加到plist中：

//////////// Save data into plist /////////////////
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"datatesting.plist"];
NSLog(@"path='%@'",path);

NSFileManager *nfm = [[NSFileManager alloc] init];
if([nfm fileExistsAtPath:path])
{
    // if file exists, get its contents, add more entries and write back
    NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:path];
    NSArray *keys = [NSArray arrayWithObjects:@"Title",@"Description",@"Coordinate",nil]; 

    [array addObject:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[NSString stringWithFormat:@"%@",titlestring],[NSString stringWithFormat:@"%@",descriptionstring],[NSString stringWithFormat:@"%@",coordinadastring], nil] forKeys:keys]]; 
    NSLog(@"modified array=%@",array);
    BOOL ok = [array writeToFile:path atomically:YES];
    if(!ok){
        NSLog(@"Unable to write appended file");
        return;
    }

} else {

    // if file doesn't exist, create a new one
    NSMutableArray *array = [[NSMutableArray alloc] init];
    NSArray *keys = [NSArray arrayWithObjects:@"Title",@"Description",@"Coordinate",nil]; 
    [array addObject:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[NSString stringWithFormat:@"%@",titlestring],[NSString stringWithFormat:@"%@",descriptionstring],[NSString stringWithFormat:@"%@",coordinadastring], nil] forKeys:keys]]; 
    NSLog(@"new array=%@",array);
    BOOL ok = [array writeToFile:path atomically:YES];
    if(!ok){
        NSLog(@"Unable to write new file");
        return;
    }
}

现在我在使用plist的内容时遇到了问题。所以我的两个问题是： - 当前plist的词典的键是什么？ - 阅读Tableview中内容的方法是什么？

Answer 1

你有一系列词典。您需要迭代数组的内容，然后查看每个字典。您可以使用块枚举器或较旧的for（）样式执行此操作。我现在会使用后者，因为你可能不知道块。

NSArray *array = ...; // read in the array from the file
for(NSDictionary *dict in array) {
  NSString *title = [dict objectForKey:@"Title"];
  ... etc
}

如果要在tablview中显示此数据，则行数是字典数（即[数组计数]）。如果你只想显示每个单元格的标题，你将获得单元格行号，然后通过[array objectAtIndex：cellRow]获取字典，然后按上面的方式拉出标题。

Plist dicionaries键

1 个答案: