将数据从 plist 加载到另一个类

Posted 2023-03-25

【中文标题】将数据从 plist 加载到另一个类

【英文标题】：loading data from plist to another class

【发布时间】：2012-12-17 16:53:09

【问题描述】：

在我的应用中，plist 文件被保存到文档目录中，每个文件名都是当前日期+时间。

我正在将文档目录中的文件列表加载到表中：filesTableVC.m.

每次我想将所选文件加载到新类时：oldFormVC.m 但是这个类是空开的。

我不确定问题出在哪里。

filesTableVC.m：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

    oldFormVC *oldForm = [[oldFormVC alloc] initWithNibName:nil bundle:nil];

    //load previous data:
    // get paths from root direcory
    NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
    // get documents path
    NSString *documentsPath = [paths objectAtIndex:0];
    // get the path to our Data/plist file
    NSString *plistPath = [documentsPath stringByAppendingPathComponent:[fileList objectAtIndex:indexPath.row]];

    // check to see if Data.plist exists in documents
    if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath])
    
        // if not in documents, get property list from main bundle
        plistPath = [[NSBundle mainBundle] pathForResource:@"Data" ofType:@"plist"];
    

    // read property list into memory as an NSData object
    NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath];
    NSString *errorDesc = nil;
    NSPropertyListFormat format;
    // convert static property liost into dictionary object
    NSDictionary *temp = (NSDictionary *)[NSPropertyListSerialization propertyListFromData:plistXML mutabilityOption:NSPropertyListMutableContainersAndLeaves format:&format errorDescription:&errorDesc];
    if (!temp)
    
        NSLog(@"Error reading plist: %@, format: %d", errorDesc, format);
    

    // assign values
    self.theDate = [temp objectForKey:@"theDate"];
    self.theTime = [temp objectForKey:@"theTime"];
    self.carNumber = [temp objectForKey:@"carNumber"];
    self.driverName = [temp objectForKey:@"driverName"];

    [self presentViewController:oldForm animated:YES completion:nil];

---

oldFormVC.m：

- (void)viewDidLoad

    [super viewDidLoad];

    dateField.text = theDate;
    timeField.text = theTime;
    carNumberField.text = carNumber;
    driverNameField.text = driverName;

【问题讨论】：

你使用 self.carNumber 我假设你的意思是 oldForm.carNumber

【参考方案1】：

在viewDidAppear写你的代码

- (void)viewDidAppear:(BOOL)animated

    dateField.text = theDate;
    timeField.text = theTime;
    carNumberField.text = carNumber;
    driverNameField.text = driverName;

另外，在 filesTableVC.m 中更改此代码：

oldForm.dateField = [temp objectForKey:@"theDate"];
oldForm.theTime = [temp objectForKey:@"theTime"];
oldForm.carNumber = [temp objectForKey:@"carNumber"];
oldForm.driverName = [temp objectForKey:@"driverName"];

希望对你有帮助

【讨论】：

@Arkins 接受答案，因为它可以帮助其他人参考