Question

我在tableView中的单元格中有M13Checkbox。当用户选中此复选框时，我想在核心数据中保存一些数据

- (IBAction)completed:(M13Checkbox *)sender {


    NSDate *now = [NSDate date];
    NSNumber *yes = [NSNumber numberWithBool:YES];

    NSManagedObjectContext *context = [self managedObjectContext];

    NSManagedObject *selectedHabit = [self.habits objectAtIndex:[[self.tableView indexPathForSelectedRow] row]];
    self.habit = selectedHabit;

    NSNumber *habitID = [self.habit valueForKey:@"habitID"];

    NSNumber *habitRepeats = [self.habit valueForKey:@"habitRepeats"];

    //getting number of habit reoeats for Smart habits function
    int i = [habitRepeats intValue] + 1;
    NSNumber *repeats = [NSNumber numberWithInt:i];
    [self.habit setValue:repeats forKey:@"habitRepeats"];

    //saving completion to core data
    NSManagedObject *habitForDate = [NSEntityDescription insertNewObjectForEntityForName:@"HabitForDate" inManagedObjectContext:context];
    [habitForDate setValue:now forKey:@"date"];
    [habitForDate setValue:habitID forKey:@"habitID"];
    [habitForDate setValue:yes forKey:@"completed"];

    [context deleteObject:habitForDate];

     NSError *error = nil;
    if (![context save:&error]) {
        NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
    }

桌面视图中的习惯有不同的关键词＆＃34; habitID＆＃34;，habitForDate总是复习＆＃34; 1＆＃34;作为＆＃34; habitID＆＃34;的价值我认为问题出在代码的下面部分，我的索引错误

 NSManagedObject *selectedHabit = [self.habits objectAtIndex:[[self.tableView indexPathForSelectedRow] row]];
    self.habit = selectedHabit;

我的问题是，如何获取复选框被cliked的单元格的indexPath

Answer 1

- (IBAction)completed:(M13Checkbox *)sender {
    UITableViewCell * cell = [[sender superView] superView]; // if you added it to cell's content view.
    NSIndexPath *indexPath = [self.tableview indexPathForCell:cell];

    ....
}

Answer 2

我这样做的一种方法是使用类别UIView + Data.h并附加额外的数据。

#import "UIView+Data.h"
#import <objc/runtime.h>

const char * const viewUserDataKey = "view.userData";
@implementation UIView (Data)
- (id)userData {
    return objc_getAssociatedObject(self, viewUserDataKey);
}

- (void)setUserData:(id)userData {
    objc_setAssociatedObject(self, viewUserDataKey, userData, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end

此外，在头文件中有一个属性@property (nonatomic, strong) id userData;。

您可以在您的课程中导入以上类别，并将indexPath附加到单元格内的复选框checkBox.userData = indexPath我不确定它是否完美，但我的应用程序已在App Store中运行且工作正常！

并且，在您的方法中，您可以将indexPath读回

- (IBAction)completed:(M13Checkbox *)sender {
   NSIndexPath *indexPath = (NSIndexPath*)sender.userData;
}

获取tableview行的索引路径

2 个答案: