UIButton 导致 (lldb) 错误 EXC_BAD_ACCESS

Question

我在 SO 上多次看到这个问题，但这些问题的解决方案并没有解决我的问题。

我动态创建了一个 UIButton 并将其添加到我的视图中。我给按钮添加了一个目标，这是一个函数。

目标函数运行（即打印语句运行），然后我在控制台中看到 (lldb) 错误，异常断点突出显示 AppDelegate.swift 的 class AppDelegate: UIResponder, UIApplicationDelegate 行错误 EXC_BAD_ACCESS (code=1, address=x020000000c)，应用程序崩溃。

我知道这通常是由选择器错误（即表示参数接受函数的冒号）引起的，但我已经尝试了冒号和无冒号的所有变体，但无济于事。

感谢任何帮助

来源：

import UIKit

class ViewController: UIViewController {

    var loginButton: UIButton!

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

        self.loginButton = UIButton()
        self.loginButton.frame = CGRectMake(10, 40, self.view.bounds.width - 20, 40)
        self.loginButton.setTitle("Login", forState: UIControlState.Normal)
        self.loginButton.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal)

        self.view.addSubview(self.loginButton)

        self.loginButton.addTarget(self, action: "initLogin:", forControlEvents:.TouchUpInside)
    }

    func initLogin(button: UIButton)
    {
        println("Logging in...")
    }

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

我把自己项目的相关代码放到空白项目中，错误依旧。

Answer 1

编辑：

看起来 init 是一个特殊关键字 Swift 在桥接 ObjC 代码时使用。来自文档：

Initialization

To instantiate an Objective-C class in Swift, you call one of its initializers with Swift syntax. When Objective-C init methods come over to Swift, they take on native Swift initializer syntax. The “init” prefix gets sliced off and becomes a keyword to indicate that the method is an initialize

因此，如果您将代码更改为如下所示，它将起作用。

感谢@cedabob 提供参考：https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithObjective-CAPIs.html#//apple_ref/doc/uid/TP40014216-CH4-XID_26

class ViewController: UIViewController {

        var loginButton: UIButton!

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

            self.loginButton = UIButton()
            self.loginButton.frame = CGRectMake(10, 40, self.view.bounds.width - 20, 40)
            self.loginButton.setTitle("Login", forState: UIControlState.Normal)
            self.loginButton.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal)

            self.view.addSubview(self.loginButton)

            self.loginButton.addTarget(self, action: "login:", forControlEvents:.TouchUpInside)
        }

        func login(button: UIButton)
        {
            println("Logging in...")
        }

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

UIButton 导致 (lldb) 错误 EXC_BAD_ACCESS

UIButton causes (lldb) error with EXC_BAD_ACCESS

uibutton

uikit

ios

swift