[英]Why is this causing an unrecognized selector error?
import UIKit
import Toolbar
class ViewController: UIViewController {
lazy var toolbar: Toolbar = {
let toolbar: Toolbar = Toolbar([
Toolbar.Item(title: "BUTTON", target: nil, action: #selector(test(_:))),
Toolbar.Item(title: "BUTTON", target: nil, action: nil),
Toolbar.Item(title: "BUTTON", target: nil, action: nil)
])
return toolbar
}()
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = .systemBackground
self.view.addSubview(self.toolbar)
}
@objc func test(_ sender: Any) {
print("hello")
}
}
在我按下第一个工具栏按钮后,应用程序崩溃了:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull test:]: unrecognized selector sent to instance 0x1de715eb0'
terminating with uncaught exception of type NSException
CoreSimulator 802.6 - Device: iPhone 13 mini (41207433-2958-4380-93E0-D0448B566794) - Runtime: iOS 15.4 (19E240) - DeviceType: iPhone 13 mini
(lldb)
我不知道我是如何错误地调用测试 function 的?
代替:
Toolbar.Item(title: "BUTTON", target: nil, action: #selector(test(_:))),
尝试:
Toolbar.Item(title: "BUTTON", target: self, action: #selector(test(_:))),
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