ios - UITableView 单元格中的复选框

Question

我写了一个应用程序，列出了一些书的标题、缩略图和二手价格。这一切都是使用 UITableView 完成的，数据是从 .plist 文件中获取的。

我想为每个单元格添加一个复选框，如果用户有书或没有书，可以切换该复选框，然后存储该复选框状态以供他们下次使用该应用程序时使用。是否可以将值存储回 .plist 文件或有其他方法吗？

这是我目前为单元格编写的代码:

@implementation ffbooksCell

@synthesize ffbooksLabel = _ffbooksLabel;
@synthesize priceLabel = _priceLabel;
@synthesize thumbnailImageView = _thumbnailImageView;


- (void) viewDidLoad {
    NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

    NSString* path = [documentsDirectory stringByAppendingPathComponent:@"ffbooks.plist"];
    NSMutableArray* checkboxSelected = nil;
    // Attempt to load saved data from the documents directory
    if ([[NSFileManager defaultManager] fileExistsAtPath:path]){
        checkboxSelected = [NSMutableArray arrayWithContentsOfFile:path];
    }else{
        // No saved data in documents directory so we need to load the data from the bundle
        NSString* bundlePath = [[NSBundle mainBundle] pathForResource:@"ffbooks" ofType:@"plist"];
        checkboxSelected = [NSMutableArray arrayWithContentsOfFile:bundlePath];
    }

    //...
    // Toggle check box for book 0
    if ([checkboxSelected[0][@"checkbox"] boolValue]){
        checkboxSelected[0][@"checkbox"] = @NO;
    }else{
        checkboxSelected[0][@"checkbox"] = @YES;
    }
    // Note: @"checkbox" does not need to be in the original plist
    //...

    [checkboxSelected writeToFile:path atomically:YES];

    if (checkboxSelected == 0){
        [checkboxButton setSelected:NO];
    } else {
        [checkboxButton setSelected:YES];
    }

}

- (IBAction)checkboxButton:(id)sender{

    if (checkboxSelected == 0){
        [checkboxButton setSelected:YES];
        checkboxSelected = 1;
    } else {
        [checkboxButton setSelected:NO];
        checkboxSelected = 0;
    }

}


- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        // Initialization code
    }
    return self;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}


@end

Answer 1

有很多方法可以将数据存储在 plist 中。核心数据将是我的选择。学习如何使用核心数据值得投入时间。您仍然可以使用 plist 来预填充您的数据库。

但是要回答您的问题，您可以将数据存储在 plist 中。假设初始数据存储在包中并且是字典数组，这里是一些示例代码。

NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSString* path = [documentsDirectory stringByAppendingPathComponent:@"books.plist"];
NSMutableArray* info = nil;
// Attempt to load saved data from the documents directory
if ([[NSFileManager defaultManager] fileExistsAtPath:path]){
    info = [NSMutableArray arrayWithContentsOfFile:path];
}else{
    // No saved data in documents directory so we need to load the data from the bundle
    NSString* bundlePath = [[NSBundle mainBundle] pathForResource:@"books" ofType:@"plist"];
    info = [NSMutableArray arrayWithContentsOfFile:bundlePath];
}

//...
// Toggle check box for book 0
if ([info[0][@"checkbox"] boolValue]){
    info[0][@"checkbox"] = @NO;
}else{
    info[0][@"checkbox"] = @YES;
}
// Note: @"checkbox" does not need to be in the original plist
[info writeToFile:path atomically:YES];

更新:我已经为你创建了一个要点来帮助你将数据加载到 TableView Controller 中 https://gist.github.com/datinc/9075686