Ios 尝试在iPhone上演示UIImagePickerController时崩溃

当我试图从特定的视图控制器显示

UIImagePickerController

时，我的应用程序正在崩溃

我有一个对象，

CLYImagePickerController

，它为

UIImagePickerController

处理简单的事情，例如创建、显示和处理

UIAlertView

，它为用户显示哪种

UIImagePickerController

的选项，并处理用户选择的图像。此对象告诉代理视图控制器使用以下方法呈现

UIImagePickerController

：

- (void)showImagePickerForSourceType:(UIImagePickerControllerSourceType)sourceType
{
    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
    imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
    imagePickerController.sourceType = sourceType;
    imagePickerController.delegate = self;

    [self.delegate presentViewController:imagePickerController animated:YES completion:nil];
}

---

编辑2013年11月27日：

self

是第二段中描述的

CLYImagePickerController

。它只是一个NSObject子类

CLYImagePickerController

的

委托

按以下方式定义：

@property (weak, nonatomic) UIViewController <CLYImagePickerControllerDelegate> *delegate;

这个怎么样：

- (void) showImagePickerForSourceType:(UIImagePickerControllerSourceType)sourceType
{    
    if ([UIImagePickerController isSourceTypeAvailable:sourceType])
    {
        UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
        imagePickerController.sourceType = sourceType;
        imagePickerController.delegate = self;
        [self.delegate presentModalViewController:imagePickerController animated:NO]; 
        // if this doesn't work try using:
        // if ([self.providerDelegate respondsToSelector:@selector(showImagePicker:)]) {
        //    [self.providerDelegate performSelectorOnMainThread:@selector(showImagePicker:)
        //                                            withObject:imagePickerController
        //                                         waitUntilDone:NO];
        //}
    }
}

---

我认为这是一个已知的苹果错误，与加载某些字体有关。以下是一个解决方法：

---

什么是自我类型的课程？我认为您应该替换代码[self.delegate presentViewController:imagePickerController animated:YES completion:nil]；使用[自呈现视图控制器：imagePickerController已设置动画：是完成：无]；如果self是UIViewController子类。请提供委托是什么（希望是UIViewController的子类）以及CLYImagePickerController是否是NSObject的子类的详细信息。我对我的问题进行了编辑，以便更清楚地了解上述代码中的

self

指的是什么，以及委托是什么。基本上，

self

是一个NSObject子类，它只处理与UIImagePickerController相关的设置代码，

delegate

是一个UIViewController子类，它表示由

CLYImagePickerController

创建的

UIImagePickerController

在这种情况下，代理表示模式视图。我在上面的编辑中添加了一个说明。只有视图控制器才能显示模式视图。请在评论之前阅读我的编辑。我澄清了委托确实是

UIViewController

的子类。我尝试了您的第二个建议（使用presentModalViewController:animated:），但同样的问题仍然存在。

- (void) showImagePickerForSourceType:(UIImagePickerControllerSourceType)sourceType
{    
    if ([UIImagePickerController isSourceTypeAvailable:sourceType])
    {
        UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
        imagePickerController.sourceType = sourceType;
        imagePickerController.delegate = self;
        [self.delegate presentModalViewController:imagePickerController animated:NO]; 
        // if this doesn't work try using:
        // if ([self.providerDelegate respondsToSelector:@selector(showImagePicker:)]) {
        //    [self.providerDelegate performSelectorOnMainThread:@selector(showImagePicker:)
        //                                            withObject:imagePickerController
        //                                         waitUntilDone:NO];
        //}
    }
}