小编Anu*_*han的帖子

点击按钮时访问照片库时遇到麻烦.像往常一样,我在问它是否可以访问.以下是我的代码

@IBAction func photoLibraryButtonTapped(sender: UIButton) {

        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary) {
            let imagePicker = UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
            imagePicker.allowsEditing = true
            self.presentViewController(imagePicker, animated: true, completion: nil)
        }
    }

这是Xcode所说的:

2016-08-08 23:05:11.209 Auyrma[1799:20237892] -[UIViewController photoLibraryButtonTapped:]: unrecognized selector sent to instance 0x7fd3e9d39ed0
2016-08-08 23:05:11.214 Auyrma[1799:20237892] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController photoLibraryButtonTapped:]: unrecognized selector sent to instance 0x7fd3e9d39ed0'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000113fdcd85 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x0000000113a50deb objc_exception_throw + 48
    2 …

我现在使用 Swift 2.3。我使用以下代码为按钮添加了边框：

self.history.layer.borderWidth = 1
self.history.layer.borderColor = UIColor.mainColor().CGColor

结果我得到了：

现在，我需要删除左右边框，只剩下顶部和底部边框。我该如何管理？

补充：感谢@Teja，我看到了另一个问题CALayer：仅在一侧添加边框 但是，问题是我需要底部和顶部。但是，在添加-1、-1 CALayer 之后，只添加了底部的一个。