Question

我的应用程序遇到了一些问题。当我按下UIButton时，消息线程1：信号SIGABRT不断弹出。

这是我的代码：

import UIKit

class ViewController: UIViewController {
@IBOutlet var instructions: UILabel!


@IBOutlet var lockStatus: UIImageView!

@IBAction func hackButton(sender: AnyObject) {

    let timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: "update", userInfo: nil, repeats: false)


        while(timer == 1){instructions.text = "loading"}
        while(timer == 2){instructions.text = "loading."}
    while(timer == 3) {instructions.text = "loading.."}
        while(timer == 4){instructions.text = "loading..."}
        while(timer == 5) {instructions.text = "hack successful!"
            lockStatus.image = UIImage(named: "unlocked.png")
            timer.invalidate()

    }

    }



override func viewDidLoad() {

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

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

我检查了调试器，它一直说我发送了一个无法识别的选择器发送到实例0x7fa7baebc4c0。有人能帮我弄清楚这意味着什么吗？

Answer 1

那是因为timer == 1并不意味着什么。函数更新将由计时器调用，您可以自己保留计数器并递增它。

Answer 2

您在创建计时器时尝试使用名为“update”的方法，但您的代码（至少是您共享的部分）没有更新功能。

@IBAction func hackButton(sender: AnyObject) {
    let timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: "update", userInfo: nil, repeats: false)
}

func update() {   // do your updates here 
}

点击按钮时无法识别选择器错误

2 个答案: