ios - Swift 2.0 - NSMutableArray - 删除对象

Question

在我的代码中，我创建了一个循环，根据数组中的对象数量创建 UIView 和 UIButton 。

一切都按预期进行，每次我按下删除按钮时，UIView就会从 super View 中删除。

但是，如果我第一次按下带有 tag=0 的顶部 UIView 中的删除按钮，则会重复执行 loadUser 3多次导致应用程序崩溃。

我的代码哪里做错了？

var customViewUser: UIView?
var names:NSMutableArray = []

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    userNames()
    LoadUsers()
}

func userNames(){
    names = ["aaa", "bbb", "ccc", "ddd", "eee", "fff"]
}

func LoadUsers() {
    let countUsers = names.count

    print("\(countUsers) Users")
    for (index, _) in names.enumerate() {
        print("User n: \(index)")

        let userNameViewsY = CGFloat(index * 128)

        //FIRST USER VIEW
        customViewUser = UIView(frame: CGRectMake(0, userNameViewsY, self.view.frame.size.width, 128))
        customViewUser!.backgroundColor=UIColor.greenColor()
        customViewUser!.layer.borderColor = UIColor.lightGrayColor().CGColor
        customViewUser!.layer.borderWidth = 3
        customViewUser!.tag = index
        self.view.addSubview(customViewUser!)

        let customButtonDeleteVideoUser = UIButton(frame: CGRectMake(customViewUser!.frame.size.width - 200, 4, 100, 28))
        customButtonDeleteVideoUser.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
        customButtonDeleteVideoUser.setTitle("Delete", forState: UIControlState.Normal)

        customButtonDeleteVideoUser.addTarget(self, action: "deleteButton:", forControlEvents:.TouchUpInside)
        customViewUser!.addSubview(customButtonDeleteVideoUser)
        // set tag
        customButtonDeleteVideoUser.tag = index
    }
}

func deleteButton(sender: UIButton) {
    let index = sender.tag

    print(" User \(index) selected")
    let CustomSubViews = self.view.subviews

    for subview in CustomSubViews {
        if subview.tag == index {
            print(subview.tag)

            if index >= 0  {
                subview.removeFromSuperview()

                names.removeObjectAtIndex(index)

                print(names)
                LoadUsers()
            }
        }

        subview.removeFromSuperview()
    }
}

Answer 1

所有未设置标签的 subview 的标签均为 0。

因此，您的代码正在查找标记值为 0 的其他 subview :

for subview in CustomSubViews {
            if subview.tag == index {

只要使用以 1 开头的标签就可以了:

customButtonDeleteVideoUser.tag = index + 1

和

let index = sender.tag - 1

和

        if subview.tag == index+1 {

这解决了问题，并且该函数只会被调用一次。但你还会遇到其他问题:

• 当删除各种 View 时，数组会变短，并且您将拥有没有相应数组位置的标签:如果不更新标签，names.removeObjectAtIndex(index) 将崩溃
• 而且，当您删除一个 View 时，您似乎会添加更多 View ，不确定这是否是故意的。