移動和縮放反彈

Question

正如您在this video中看到的那樣，每當我嘗試裁剪或移動裁剪框時都會反彈回來。我找不到任何方法來做到這一點，我認爲我的代碼是正確的。我想如何做到這一點？

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { 
    UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Error" 
                  message:@"Device has no camera" 
                 delegate:nil 
               cancelButtonTitle:@"OK" 
               otherButtonTitles: nil]; 
    [myAlertView show]; 
    } 
} 

- (IBAction)takePhoto:(UIButton *)sender { 
    UIImagePickerController *picker = [[UIImagePickerController alloc] init]; 
    picker.delegate = self; 
    picker.allowsEditing = YES; 
    picker.sourceType = UIImagePickerControllerSourceTypeCamera; 
    [self presentViewController:picker animated:YES completion:NULL]; 
} 

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { 
    UIImage *chosenImage = info[UIImagePickerControllerEditedImage]; 
    self.imageView.image = chosenImage; 
    [picker dismissViewControllerAnimated:YES completion:NULL]; 
} 

Answer 1

如果圖像是太遠使用此方法將其動畫回：

[UIView animateWithDuration: animations: completion:] 

動畫：是塊，它會改變如CGRects在持續時間，如果你想改變形象您添加的位置[image setRect:(CGRectMake(orginPosition.x, orginPosition.y, size.width, size.height))];

完成：是一個塊，但不是必需的。