Change bool status for all objects of all cells in the tableView

问题

Each cell in my tableView has various properties:

class: Item
// properties
    var name: String
    var photo: UIImage?
    var category: String
    var instructions: String
    var completed = false

(everything is initialized as well)

my tableView array is:

items = [Item]()

When Item.complete is true, the cell will have a checkmark accessory, else it'll have .none

I want to use a UIButton (in a separate VC) to make Item.complete = false for every cell in the tableView, thus removing all of the checkmarks and essentially resetting the data.

My items: Item array is variable, in that the user has the option to add or delete any row in the array.

I want the UIButton (located on a separate VC in a separate tab) to segue to the tableView and make the changes.

How can I change each cells .complete property to equal false with a UIButton so that I can remove the checkmark on every cell?

回答1:

You can also use the .map function.

You cam run this directly in a Playground page:

class Item: NSObject {
    var name: String = ""
    var completed: Bool = false
}

// declare items array
var items = [Item]()

// fill with 20 Items, 
// setting .completed for every-other one to true
for n in 0...19 {
    let newItem = Item()
    newItem.name = "item-\(n)"
    newItem.completed = n % 2 == 0
    items.append(newItem)
}

// print out the items in the array
print("Original values")
for item in items {
    print(item.name, item.completed)
}
print()

// -- this is the .map function
// set .completed to false for every item in the array
items = items.map {
    (item: Item) -> Item in
    item.completed = false
    return item
}
// -- this is the .map function

// print out the items in the array
print("Modified values")
for item in items {
    print(item.name, item.completed)
}

and then, of course, call .reloadData() on your table.

回答2:

Loop through items array and set property to false

for i in 0..<items.count {
    items[i].completed = false
}

Once done, reload your tableview:

tableView.reloadData()

Addition if your question is how to do this from a separate VC, then I would suggest to learn delegation in Swift, here is a post

回答3:

There is a function to execute a closure for each item of the array

items.forEach{ $0.completed = false }
tableView.reloadData()

来源：https://stackoverflow.com/questions/46717778/change-bool-status-for-all-objects-of-all-cells-in-the-tableview

标签

ios

arrays

swift

uitableview