保存/加载 plist 问题

Question

我正在尝试一些非常简单的东西来尝试从 Plist 保存和加载，但它不起作用。 如果有人想查看我的代码并让我知道出了什么问题，我将不胜感激。

- (IBAction)testSave:(id)sender {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *plistLocation = [documentsDirectory stringByAppendingPathComponent:@"data.plist"];
    NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:plistLocation];
    [plistDict setObject:@"test" forKey:@"test"];
    [plistDict writeToFile:plistLocation atomically: YES];
}
- (IBAction)testLoad:(id)sender {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *plistLocation = [documentsDirectory stringByAppendingPathComponent:@"data.plist"];
    NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:plistLocation];
    testField.text = [plistDict objectForKey:@"test"];
}

谢谢！

Answer 1

To write the File : You are making mistake here

- (IBAction)testSave:(id)sender {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *plistLocation = [documentsDirectory stringByAppendingPathComponent:@"data.plist"];
    // Declare Dictionary Object
    NSMutableDictionary* plistDict;
    // Check if plist file exist or not, if EXIST load data from it otherwise create new
    if([[NSFileManager defaultManager] fileExistsAtPath:plistLocation])
        plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:plistLocation];
    else
        plistDict = [[NSMutableDictionary alloc] init];
    [plistDict setObject:@"test" forKey:@"test"];
    [plistDict writeToFile:plistLocation atomically: YES];
}

Your Code for Reading is Correct 试试吧。祝你好运。

Answer 2

检查您的文档目录中是否有 data.plist。为了找到找出存储在plistLocation中的值。按照路径，然后验证你是否真的有 data.plist。

希望对您有所帮助!!