iOS：UIImagePickerController - 使用工具栏属性？

Posted 2023-03-08

【中文标题】iOS：UIImagePickerController - 使用工具栏属性？

【英文标题】：iOS: UIImagePickerController - using toolbar property?

【发布时间】：2012-07-24 18:41:54

【问题描述】：

鉴于以下代码，按钮不会显示在工具栏上。有什么不对？

UIImagePickerController* cameraPickerController = [[UIImagePickerController alloc] init];
cameraPickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraPickerController.delegate =self;
cameraPickerController.showsCameraControls = NO;
cameraPickerController.toolbarHidden = NO;

UIBarButtonItem *cancelBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Cancel" style:UIBarButtonItemStyleBordered target: self action: @selector(cancel)];
UIBarButtonItem *flexibleBarSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
flexibleBarSpace.width = 1000;
UIBarButtonItem *cameraBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:cameraPickerController action:@selector(takePicture)];
UIBarButtonItem *faceBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Show facemask" style:UIBarButtonItemStyleBordered target: self action: @selector(showFacemask)];
cameraPickerController.toolbar.items = [NSArray arrayWithObjects:cancelBarButtonItem,flexibleBarSpace,cameraBarButtonItem,flexibleBarSpace,faceBarButtonItem,nil];

[self presentModalViewController:cameraPickerController animated:YES];

理论上，那些 cancelBarButtons 和其他应该显示在工具栏上。但是，在这种情况下不会。请指教。

【参考方案1】：

您不能将项目添加到工具栏，因为它还没有被UIImagePickerController 呈现（我想。）试试这个：

UIImagePickerController* cameraPickerController = [[UIImagePickerController alloc] init];
cameraPickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraPickerController.delegate =self;
cameraPickerController.showsCameraControls = NO;

UIToolbar *theToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 436, 320, 44)];

UIBarButtonItem *cancelBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Cancel" style:UIBarButtonItemStyleBordered target: self action: @selector(cancel)];
UIBarButtonItem *flexibleBarSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
flexibleBarSpace.width = 1000;
UIBarButtonItem *cameraBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:cameraPickerController action:@selector(takePicture)];
UIBarButtonItem *faceBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Show facemask" style:UIBarButtonItemStyleBordered target: self action: @selector(showFacemask)];

theToolbar.items = [NSArray arrayWithObjects:cancelBarButtonItem, flexibleBarSpace, cameraBarButtonItem, faceBarButtonItem, nil];

[cameraPickerController setCameraOverlayView:theToolbar];

[self presentModalViewController:cameraPickerController animated:YES];

基本上我只是创建了一个新工具栏并将其设置为cameraOverlayView。

干杯！

【讨论】：

我也和你有同样的想法。我这样做了，令我惊讶的是，它显示了一个空栏。我知道代码有效，因为在其他地方，我使用类似的代码并且工具栏有效。我相信这里隐藏着一些东西可以阻止它。你自己试过吗？它对你有用吗？

是的，我尝试了这个确切的代码，它对我有用。您在上面发布的代码只是向我显示了一个空白工具栏。

我确实摆脱了 toolbarHidden=no，也许是这样？

我刚刚又试了一次，它确实有效。我不确定我之前做了什么。谢谢。

【参考方案2】：

为了那些搜索和找到这篇文章的人的利益，迟到的答案。

在ios 5及以后的版本中，解决方法是调用presentViewController:animated:completion，在完成块中设置工具栏项。

    UIImagePickerController* cameraPickerController = [[UIImagePickerController alloc] init];
    cameraPickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
    cameraPickerController.delegate =self;
    cameraPickerController.showsCameraControls = NO;
    cameraPickerController.toolbarHidden = NO;

    UIBarButtonItem *cancelBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Cancel" style:UIBarButtonItemStyleBordered target: self action: @selector(cancel)];
    UIBarButtonItem *flexibleBarSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    flexibleBarSpace.width = 1000;
    UIBarButtonItem *cameraBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:cameraPickerController action:@selector(takePicture)];
    UIBarButtonItem *faceBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Show facemask" style:UIBarButtonItemStyleBordered target: self action: @selector(showFacemask)];

    //cameraPickerController.toolbar.items = [NSArray arrayWithObjects:cancelBarButtonItem,flexibleBarSpace,cameraBarButtonItem,flexibleBarSpace,faceBarButtonItem,nil];
    NSArray *tbItems = [NSArray arrayWithObjects:cancelBarButtonItem,flexibleBarSpace,cameraBarButtonItem,flexibleBarSpace,faceBarButtonItem,nil];

    // [self presentModalViewController:cameraPickerController animated:YES];
    cameraPickerController.modalTransitionStyle = UIModalPresentationFullScreen;
    [self presentViewController:picker animated:YES completion:^
        cameraPickerController.toolbar.items = tbItems;
    ];

【参考方案3】：

于是我搜索了类似的问题，发现this

但基本上他的问题是他正在尝试

[self presentModalViewController:foo animated:YES];

修复是

[self.tabBarController presentModalViewController:camera animated:YES];

看看这是否也能解决你的问题。没有看到更多代码很难确定

【讨论】：

抱歉没有解决。我根本没有使用 TabbarController。