@property (strong, nonatomic) UIPopoverController *pop;

//选取图片 - (IBAction)selectImage:(UIButton *)sender{    UIImagePickerController *picker = [[UIImagePickerController alloc] init];    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])    {        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;        picker.delegate = self;                self.pop = [[UIPopoverController alloc] initWithContentViewController:picker];        self.pop.delegate = self;        [self.pop presentPopoverFromRect:sender.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];    }}

实现UIImagePickerController委托方法：

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{    [self.pop dismissPopoverAnimated:YES];}-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{    UIImage *image = [info valueForKey:@"UIImagePickerControllerOriginalImage"];    self.masterViewController.mainImage = image;    self.imageView.image = image;    [self.pop dismissPopoverAnimated:YES];}

实现clearImage:方法，实现视图重设。

- (IBAction)clearImage:(id)sender{    self.imageView.image = nil;    self.masterViewController.mainImage = nil;}