UIImagePickerController问题

Question

在我的应用中，我有两个视图控制器。按下按钮时，MainViewController切换到AlbumViewController。 AlbumVC应该允许用户从PhotoLibrary和/或CameraRoll中选择一张图片。所以，我尝试启动UIImagePickerController。

然而，当应用程序运行时，我根本看不到UIImagePickerController。不是编译器错误，也没有运行时错误。

善良的灵魂可以帮助我！

这是源.....山姆

MainViewController.h

    #import <UIKit/UIKit.h>

    @interface iNotateViewController : UIViewController {

    }

@end

MainViewController.m

#import "iNotateViewController.h"

@implementation iNotateViewController

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
    // Release anything that's not essential, such as cached data
}


- (void)dealloc {
    [super dealloc];
}

@end

AlbumViewController.h

#import <UIKit/UIKit.h>
#import <UIKit/UIViewController.h>

@interface AlbumViewController : UIViewController <UINavigationControllerDelegate,
                                                    UIImagePickerControllerDelegate >{

}
@end

AlbumViewController.m

    - (void)viewDidLoad {

        [super viewDidLoad];

        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
            UIImagePickerController *picker;
            picker = [[UIImagePickerController alloc] init];
            picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
            picker.allowsImageEditing = YES;

            picker.delegate = self;

            [self presentModalViewController:picker animated:YES];

            [picker release];       
        }
    }


    -(void)imagePickerController: (UIImagePickerController *) picker
           didFinishPickingImage: (UIImage *) image
                     editingInfo: (NSDictionary *) editingInfo {
        [self useImage:image];
        [[picker parentViewController] dismissModalViewControllerAnimated:YES];
    }

    -(void)imagePickerControllerDidCancel: (UIImagePickerController *)picker {
        [[picker parentViewController] dismissModalViewControllerAnimated:YES];
    }
@end

Answer 1

我相信你应该将[picker release]移动到dealloc方法

Answer 2

在 AlbumViewController.m 中，更改方法- (void)viewDidLoad中的以下代码行

自：

[self presentModalViewController:picker animated:YES];

要：

[self.navigationController presentModalViewController:picker animated:YES];