Question

我有一个应用程序，用户可以从相机拍照，图像显示在imageview中。它第一次工作正常，但第二次应用程序崩溃，留下内存警告级别= 1

我谷歌周围并尝试了所有可能的方法，但没有使用

以下是我在我的应用中使用的代码

       UIImagePickerController *imgpicker;

        @property(nonatomic,retain) UIImagePickerController *imgpicker;



        @synthesize imgpicker;  

        if(actionSheet.tag==1)
            {
                NSLog(@"button index:%i",buttonIndex);
                if(buttonIndex == 0)
                { NSLog(@"button index for camera:%i",buttonIndex);
                    if(self.imgpicker==nil){
                    self.imgpicker=[[UIImagePickerController alloc]init];

                    self.imgpicker.delegate =self;
                    self.imgpicker.sourceType=UIImagePickerControllerSourceTypeCamera;

                    }

                    [self presentModalViewController:self.imgpicker animated:YES];


                    [imgpicker release];
                    return;

                }
}

        - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
        {
           NSLog(@"didFinishPickingMediaWithInfo editing info:%@",info);
            UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];



            imageview = [[UIImageView alloc] initWithFrame:CGRectMake(65, 10, 75, 75)];



                NSData *newjpg = UIImageJPEGRepresentation(image, 0.5);



            [imageview setImage:[UIImage imageWithData:newjpg]];



            [scrollView addSubview:imageview];



            [self.view addSubview:scrollView];

            [[picker parentViewController] dismissModalViewControllerAnimated:YES];
    }

请帮帮我

Answer 1

尝试更改此内容：

self.imgpicker=[[UIImagePickerController alloc]init];

到此：

self.imgpicker=[[[UIImagePickerController alloc]init] autorelease];

并删除此行：

[imgpicker release];

如果您不止一次显示图像选择器，那么每次拾取器完成时，您都会从图像视图中泄漏内存。您还要将图像视图添加到滚动视图，并且每次都将滚动视图添加到视图控制器的视图中。您只需要执行一次，然后更新图像视图上的image属性。

试试这个：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSLog(@"didFinishPickingMediaWithInfo editing info:%@",info);
    UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];

    if (imageview == nil) {
        imageview = [[UIImageView alloc] initWithFrame:CGRectMake(65, 10, 75, 75)];
        [scrollView addSubview:imageview];
        [self.view addSubview:scrollView];
    }

    NSData *newjpg = UIImageJPEGRepresentation(image, 0.5);

    [imageview setImage:[UIImage imageWithData:newjpg]];

    [[picker parentViewController] dismissModalViewControllerAnimated:YES];
}

Answer 2

请在AppDelegate类中创建UIImagePickerController对象，并在AppDidFinishloading方法中初始化：didFinishLaunchingWithOptions。在appDelegate dealloc方法上重新发布它。您可以从appdelegate类在所需的视图控制器页面中访问它。请不要在需要时创建evertytime UIImagePickerController对象并将其重新定位。

这可能会对你有所帮助。

Answer 3

请使用此代码：

App代表 // .h

#import <UIKit/UIKit.h>

@interface MyProjectAppDelegate : NSObject <UIApplicationDelegate> {

    UIImagePickerController *image_picker;

    UIWindow *window;
    UINavigationController *navigationController;
}
@property(nonatomic, retain) UIImagePickerController *image_picker;
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;

-(void)initializeImagePickerView;

@end

// .m

#import "MyProjectAppDelegate.h"
#import "RootViewController.h"

@implementation MyProjectAppDelegate

@synthesize window;
@synthesize navigationController,image_picker;

#pragma mark -
#pragma mark Application lifecycle

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    // Override point for customization after application launch.
    [self initializeImagePickerView];

    // Set the navigation controller as the window's root view controller and display.
    self.window.rootViewController = self.navigationController;
    [self.window makeKeyAndVisible];

    return YES;
}

-(void)initializeImagePickerView
{
    // Picker View
    self.image_picker = [[UIImagePickerController alloc] init];
    self.image_picker.allowsImageEditing = YES;
}

- (void)dealloc {
    [image_picker release];
    [navigationController release];
    [window release];
    [super dealloc];
}
@end

// RootView控制器 // .h

#import <UIKit/UIKit.h>
#import "MyProjectAppDelegate.h"

@interface RootViewController : UIViewController <UIImagePickerControllerDelegate,UINavigationControllerDelegate>{

    MyProjectAppDelegate *appDelegate;
}
-(IBAction)btnPhotoPressed:(id)sender;
@end

// .m

#import "RootViewController.h"
@implementation RootViewController

#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
    [super viewDidLoad];

    appDelegate = (MyProjectAppDelegate *)[[UIApplication sharedApplication] delegate];
}

-(IBAction)btnPhotoPressed:(id)sender
{
    appDelegate.image_picker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
    appDelegate.image_picker.delegate=self;
    [self presentModalViewController:appDelegate.image_picker animated:YES];
}

#pragma mark UIImagePickerController delegate
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    // Access the uncropped image from info dictionary
    UIImage *imgCapturePhoto = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

    // You can use image here

    [self dismissModalViewControllerAnimated:YES];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *) picker
{
    [picker dismissModalViewControllerAnimated:YES];
}
- (void)dealloc {
    [super dealloc];
}

这肯定会对你有所帮助。

编程为uiimagepickercontroller接收信号0

3 个答案: