ios - 在iOS程序中读取plist

Question

因为我是 iOS 初学者，我只想在我的程序中读取一个简单的属性列表文件 (plist)，但它向我显示消息“终止应用程序到期未捕获的异常“NSInvalidArgumentException”，原因:“-[ViewController dataFilePath]:无法识别的选择器发送到实例 0x15638660”。请帮助我解决我在程序中遇到的问题。

(.h file)
@interface ViewController : UIViewController {
NSString *listPath;
NSMutableArray *array;
}

- (NSString *) dataFilePath;
- (void) writePlist;
- (void) readPlist;

(.m file)
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
UIButton *readBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];        readBtn.frame = CGRectMake(110,110,72,39);
[readBtn setTitle:@"Read" forState:UIControlStateNormal];
[readBtn addTarget:self            action:@selector(readPlist)forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:readBtn];

UIButton *writeBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
writeBtn.frame = CGRectMake(110,210,72,39);
[writeBtn setTitle:@"Write" forState:UIControlStateNormal];
[writeBtn addTarget:self  action:@selector(writePlist)  forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:writeBtn];

    [super viewDidLoad];

- (NSString *)DocDirectories {
NSArray *path =                    NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *DocumentDirectory=[path objectAtIndex:0];
return  [DocumentDirectory stringByAppendingString:@"Data.plist"];

- (void)writePlist
{
NSMutableArray *anArray = [[NSMutableArray alloc]init];     
[anArray addObject:@"A"];
[anArray addObject:@"B"];
[anArray writeToFile:[self dataFilePath] atomically:YES];
}

- (void)readPlist
{
NSString *filePath = [self dataFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
    NSArray *array = [[NSArray alloc] initWithContentsOfFile:filePath];
    NSLog(@"%@\n", array);
    NSLog(@"%@\n",filePath);
   // [array release];    
}
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end
}

Answer 1

您的 View Controller 没有方法 dataFilePath。

您需要调用函数 DocDirectories。

- (void)writePlist
{
    NSMutableArray *anArray = [[NSMutableArray alloc]init];     
    [anArray addObject:@"A"];
    [anArray addObject:@"B"];
    [anArray writeToFile:[self DocDirectories] atomically:YES];
}

希望对您有所帮助。