我有以下功能,显示一个带有两个不同选项的操作表.目前,唯一实施的选项是标题为“照片”.正确显示操作表并调用正确的操作.我的问题是,在模拟器和实际设备上,我无法显示请求访问照片库的提示.
PHPhotoLibrary.authorizationStatus()返回.Denied并显示通知当前应用程序无法访问照片的模式：
@IBAction func attachPhotoButtonTapped(sender: AnyObject) {
let actionSheetController = UIAlertController(title: "Images",message: "Select image source...",preferredStyle: .ActionSheet)
let cancelAction = UIAlertAction(title: "Cancel",style: .Cancel) {
(action) in
// ...
}
actionSheetController.addAction(cancelAction)
let takePictureAction = UIAlertAction(title: "Camera",style: .Default) {
(action) in
// ...
}
actionSheetController.addAction(takePictureAction)
let choosePictureAction = UIAlertAction(title: "Photos",style: .Default) {
(action) in
PHPhotoLibrary.requestAuthorization({(status:PHAuthorizationStatus) in
switch status{
case .Authorized:
dispatch_async(dispatch_get_main_queue(),{
print("Authorized")
})
break
case .Denied:
dispatch_async(dispatch_get_main_queue(),{
print("Denied")
})
break
default:
dispatch_async(dispatch_get_main_queue(),{
print("Default")
})
break
}
})
}
actionSheetController.addAction(choosePictureAction)
presentViewController(actionSheetController,animated: true,completion: nil)
}
解决方法
发生这种情况是因为Info.plist文件中的CFBundleDisplayName键具有空值,并且无法构建警报中提示访问照片库的权限的消息.添加以下行,清理项目和再次构建可以解决问题：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleDisplayName</key>
<string>$(PRODUCT_NAME)</string>
<!-- More keys and values -->
</dict>
</plist>
感谢Vladimir Gorbenko帮助我解决这个问题.
