Question

我无法访问UIImagePickerController中定义的AppDelegate。我已在UIImagePickerController文件中定义AppDelegate.h对象也使用了其委托。这是我的代码。

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 

    picker = [[UIImagePickerController alloc] init];  
    picker.delegate = self; 
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.wantsFullScreenLayout = YES;
    picker.allowsEditing=NO;

    return YES;
}

我正在viewcontroller文件中使用操作表，并希望以 -

执行此操作

viewController.m

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
switch (actionSheet.tag) 
    {
        case 1:
            switch (buttonIndex)
        {
            case 0:
            {
AppDelegate *appDelegate = (AppDelegate*) [[UIApplication sharedApplication] delegate];
                [appDelegate.window.rootViewController presentModalViewController:appDelegate.picker animated:YES];
                    }
           }
     }
}

但是没有显示图像选择器控制器视图。

Answer 1

我相信Objective c现在会自动合成你的属性，并期待ivar的_picker。用于表示访问您的选择器，如self.picker或self.delegate.picker

Answer 2

中的

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex

不写

 [appDelegate.window.rootViewController presentModalViewController:appDelegate.picker animated:YES];

而是尝试写

 [appDelegate.window presentModalViewController:appDelegate.picker animated:YES];

让我知道它的工作与否。!!! 快乐编码!!!!!

无法显示uiimagepickercontroller

2 个答案: