我们如何在 Xcode 项目中创建自己的 plist 文件？

Question

我想在我的应用程序中创建“UrlPaths.plist”文件以及一个包含 4 或 5 个对象的字典。请帮我创建一个 plist 文件和字典。并从该 plist 文件中读取数据。

我希望 plist 将文件添加到资源文件夹中，并且当时我也想添加字典。我不希望实用地创建 plist，但我希望实用地读取数据。

Answer 1

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

NSMutableDictionary *data;

if ([fileManager fileExistsAtPath: path]) {
            data = [[NSMutableDictionary alloc] initWithContentsOfFile:path];
}
else {
    // If the file doesn’t exist, create an empty dictionary
    data = [[NSMutableDictionary alloc] init];
}

//To insert the data into the plist
data[@"value"] = @(5);
[data writeToFile: path atomically:YES];
[data release];

//To retrieve the data from the plist
NSMutableDictionary *savedStock = [[NSMutableDictionary alloc] initWithContentsOfFile:path];
int value1;
value1 = [savedStock[@"value"] intValue];
NSLog(@"%i",value1);
[savedStock release];

Answer 2

如果您打算不以编程方式创建 Plist，请按照以下步骤操作：

1. Right Click on Files in Left Pane and Select 'New File...' option.
2. Choose Resources from OS X tab.
3. An option for Property List is available.
4. Select an give an appropriate name.

这将添加到您的项目中。

Answer 3

我们可以对 plist 进行简单的了解，如下

现在您可以读取如下数据

NSString *path = [[NSBundle mainBundle] pathForResource:@"Priority" ofType:@"plist"];
NSDictionary *dictPri = [NSDictionary dictionaryWithContentsOfFile:path];//mm
NSMutableArray *arrMarkets=[[NSMutableArray alloc] initWithArray:[dictPri valueForKey:@"List"]];
NSMutableArray *arrForTable=[[NSMutableArray alloc] init];
NSMutableArray *arrForTable1=[[NSMutableArray alloc] init];
for (NSDictionary *dict in arrMarkets)
{
    NSString *strS1=nil;
    strS1= [NSString stringWithFormat:@"%@",[dict valueForKey:@"Description"] ];
    [arrForTable addObject:strS1];
}
NSLog(@"%@----------------- ",[arrForTable description]);
for (NSDictionary *dict in arrMarkets)
{
    NSString *strS2=nil;
    strS2= [NSString stringWithFormat:@"%@",[dict valueForKey:@"Name"] ];
    [arrForTable1 addObject:strS2];
}    
NSLog(@"%@----------------- ",[arrForTable1 description]);

Answer 4

创建新的 plist 文件 -

NSArray *Arr = [NSArray arrayWithObjects:obj1,obj2,nil];
        NSData *data = [NSPropertyListSerialization dataFromPropertyList:Arr  format:NSPropertyListXMLFormat_v1_0  errorDescription:nil];

     [data writeToFile:PlistDataFilePath atomically:YES];

从此 plist 文件中读取数据 -

NSData *data = [NSData dataWithContentsOfFile:PlistDataFilePath];
NSPropertyListFormat format;
NSArray *array = [NSPropertyListSerialization propertyListFromData:data mutabilityOption:NSPropertyListImmutable format:&format errorDescription:nil];

您应该阅读有关 plist 文件的这篇精彩的评论 - http://www.edumobile.org/iphone/iphone-programming-tutorials/how-to-use-plist-in-iphone/