objective-c - 构建相机应用程序... UIScrollView 不会缩放

Question

我正在构建一个相机应用程序，但无法放大图像。老实说，我不知道从哪里开始，我敢肯定这是我错过的一些愚蠢的错误。该应用程序将 selectedImageView 设置为 workingImage（来自相机的图片）。当我尝试缩放时，没有任何反应。

视图控制器.h

@interface ViewController : UIViewController <UIActionSheetDelegate, UIImagePickerControllerDelegate, UIScrollViewDelegate>

@property (strong, nonatomic) UIImage *workingImage;
@property (weak, nonatomic) IBOutlet UIImageView *chosenImageView;
@property (weak, nonatomic) IBOutlet UIScrollView *imageScroller;

-(IBAction)cameraButtonPressed;

@end

视图控制器.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.imageScroller.minimumZoomScale = 0.01f;
    self.imageScroller.maximumZoomScale = 6.0f;
    self.imageScroller.contentSize = self.imageScroller.frame.size;
    self.imageScroller.scrollEnabled = YES;

    self.navigationController.navigationBar.tintColor = [UIColor blackColor];

}

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return self.chosenImageView;
}

Answer 1

这就是问题所在。您必须从 UIScrollView 控制+拖动到 View Controller 才能设置委托。