Question

我希望在拍摄照片时为iPhone相机图像提供缩放效果。缩放效果应该是当前图像的特定部分。此效果应在捕获图像之前。

对于示例我创建了UIImagePickerController的两个对象，代码在

下面

.h文件

UIImagePickerController *imagePicker_obj1,imagePicker_obj2;
UIScrollView *scrollView_obj1,*scrollView_obj;

.m文件

imagePicker_obj1 = [[UIImagePickerController alloc]init];

imagePicker_obj2 = [[UIImagePickerController alloc]init];

imagePicker_obj1.delegate = self;

imagePicker_obj2.delegate = self;

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
        imagePicker_obj1.sourceType = UIImagePickerControllerSourceTypeCamera;
                imagePicker_obj2.sourceType = UIImagePickerControllerSourceTypeCamera;
}
    else
        exit(1);

    scrollView_obj1 = [[UIScrollView alloc]initWithFrame:CGRectMake(50.0, 250.0, 200.0, 200.0)];

    [window addSubview:scrollView_obj1];

    scrollView_obj1.contentSize = CGSizeMake(imagePicker_obj1.view.frame.size.width, imagePicker_obj1.view.frame.size.height);

    scrollView_obj1.maximumZoomScale = 4.0;
    scrollView_obj1.minimumZoomScale = 0.75;
    scrollView_obj1.clipsToBounds = YES;
    scrollView_obj1.delegate = self;
    [scrollView_obj1 addSubview:imagePicker_obj1.view];

    scrollView_obj = [[UIScrollView alloc]initWithFrame:CGRectMake(50.0, 0.0, 200.0, 200.0)];

    [window addSubview:scrollView_obj];
    [scrollView_obj setBackgroundColor:[UIColor clearColor]];
    scrollView_obj.contentSize = CGSizeMake(imagePicker_obj2.view.frame.size.width, imagePicker_obj2.view.frame.size.height);
    scrollView_obj.maximumZoomScale = 4.0;
    scrollView_obj.minimumZoomScale = 0.75;
    scrollView_obj.clipsToBounds = YES;
    scrollView_obj.delegate = self;
       [scrollView_obj addSubview:imagePicker_obj2.view];

在此之后我期望UIImagePickerController的两个不同对象给出相同的输出，并且两个滚动视图的内容将是相同的。但是我只得到UIImagePickerController的一个对象的输出，另一个是空白的。

有人可以解释出现了什么问题吗？

Answer 1

由于您只有一台摄像头，我希望在这种情况下只能使用一个UIImagePickerController控制器。

Answer 2

第二个UIImagePickerController无法抓取相机，因为第一个UIImagePickerController上有一个独占锁。

创建UIImagePickerController的多个对象

2 个答案: