Plist 读写 iPhone

发布于 2024-12-15 01:08:19 字数 1379 浏览 3 评论 0原文

我的类在读取数据并将数据写入 plist 时遇到问题。这是一些代码：

第一个块来自我的自定义类，其中包含我的所有 plist 读取和写入方法。

-(NSString *) dataFilePath{
    NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentDirectory = [path objectAtIndex:0];
    return [documentDirectory stringByAppendingPathComponent:@"userInformation.plist"];
}

-(bool)readUserIsMale{
    NSString *filePath = [self dataFilePath]; 
    if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {        
        NSDictionary *boolDict = [[NSDictionary alloc] initWithContentsOfFile:[self dataFilePath]];
        return [[boolDict objectForKey:@"boolUserIsMale"] boolValue];
    }
    return nil;
}

-(void)writeUserIsMale:(bool)boolValue{
    NSDictionary *boolDict = [[NSDictionary alloc] init];
    [boolDict setValue:[NSNumber numberWithBool:boolValue] forKey:@"boolUserIsMale"];
    [boolDict writeToFile:[self dataFilePath] atomically:YES];
}

然后，我在另一个需要导入的类中，创建并使用类方法：

#import "plistReadWrite.h"
plistReadWrite *readWrite;

如果我尝试在控制台中查看它的值，我会得到（null）返回。

NSLog(@"%@",[readWrite readUserIsMale]);

这当然是在我编写了一些数据之后，如下所示：

[readWrite writeUserIsMale:isUserMale];

isUserMale 是一个 bool 值。

任何帮助将不胜感激，如果您需要更多信息，请告诉我。谢谢。

原文

I am having troubles with my class which reads and writes data to a plist. Here is some code:

This first chunk is from my custom class with all my plist read and write methods.

-(NSString *) dataFilePath{
    NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentDirectory = [path objectAtIndex:0];
    return [documentDirectory stringByAppendingPathComponent:@"userInformation.plist"];
}

-(bool)readUserIsMale{
    NSString *filePath = [self dataFilePath]; 
    if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {        
        NSDictionary *boolDict = [[NSDictionary alloc] initWithContentsOfFile:[self dataFilePath]];
        return [[boolDict objectForKey:@"boolUserIsMale"] boolValue];
    }
    return nil;
}

-(void)writeUserIsMale:(bool)boolValue{
    NSDictionary *boolDict = [[NSDictionary alloc] init];
    [boolDict setValue:[NSNumber numberWithBool:boolValue] forKey:@"boolUserIsMale"];
    [boolDict writeToFile:[self dataFilePath] atomically:YES];
}

I then in another class where desired import, create and use the class methods:

#import "plistReadWrite.h"
plistReadWrite *readWrite;

If I try and see its value in the console I get (null) return.

NSLog(@"%@",[readWrite readUserIsMale]);

This is of course after I have written some data like so:

[readWrite writeUserIsMale:isUserMale];

isUserMale being a bool value.

Any help would be massively appreciated, if you need anymore info let me know. Thanks.

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前事休说 2024-12-22 01:08:19

我认为这基本上是正确的。在您的 writeUserIsMale: 方法中，您需要一个可变字典，因此您实际上可以设置该键（这应该按原样为您崩溃，所以我猜是复制/粘贴问题？）

//NSDictionary *boolDict = [[NSDictionary alloc] init];
//should be:

NSMutableDictionary *boolDict = [[NSMutableDictionary alloc] init];

然后当您记录该值时，请记住bool（或 BOOL）是原语，而不是对象，所以：

NSLog (@"%d",[readWrite readUserIsMale]); // Will print 0 or 1
// or if you prefer:
NSLog (@"%@", ([readWrite readUserIsMale]? @"YES":@"NO")); // print YES or NO

最后，由于这是 Objective-C，我可能会使用 BOOL 而不是 bool。

我假设这只是一个简单的例子，并且您了解 NSUserDefaults 这类事情。

希望有帮助。

I think this is mostly correct. In your writeUserIsMale: method you want a mutable dictionary, so you can actually set that key (this should have crashed for you as is, so I'm guessing a copy/paste problem?)

//NSDictionary *boolDict = [[NSDictionary alloc] init];
//should be:

NSMutableDictionary *boolDict = [[NSMutableDictionary alloc] init];

And then when you log the value, remember that bool (or BOOL) are primitives, not objects so:

NSLog (@"%d",[readWrite readUserIsMale]); // Will print 0 or 1
// or if you prefer:
NSLog (@"%@", ([readWrite readUserIsMale]? @"YES":@"NO")); // print YES or NO

Lastly, since this is objective-c, I would probably use BOOL instead of bool.

I'm assuming this is just a simple example, and that you know about NSUserDefaults for this sort of thing.

Hope that helps.

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