我这样从UIImagePicker保存图片:

将图片保存在文件中,然后在NSUserDefaults中保存失败的路径,然后在另一个类中,通过此保存的路径检索图片。

码:

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    ideaImage.image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

    [picker dismissModalViewControllerAnimated:YES];
}

-(void)saveIdea_alt
{
    [self performSelector: @selector(saveIdea)  withObject:nil afterDelay:0.1];
}
-(void)saveIdea
{
    UIImage *ideaPhoto = ideaImage.image;

    NSData *imageData = UIImagePNGRepresentation(ideaPhoto);

    NSString* imageName = @"MyImage.png";

    NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString* documentsDirectory = [paths objectAtIndex:0];

    NSString* fullPathToFile = [documentsDirectory stringByAppendingPathComponent:imageName];

    [imageData writeToFile:fullPathToFile atomically:NO];



    NSArray *arrayKeys = [[NSArray alloc]initWithObjects:@"ideaName",@"ideaCost",@"ideaNote", @"ideaImage", nil];
    NSArray *arrayObjects = [[NSArray alloc]initWithObjects:ideaName.text,ideaCost.text,ideaNote.text,fullPathToFile ,  nil];

    NSDictionary *dictionary = [[NSDictionary alloc]initWithObjects:arrayObjects forKeys:arrayKeys];
    NSMutableArray *ideasArray = [[NSMutableArray alloc]initWithArray:[[NSUserDefaults standardUserDefaults]objectForKey:@"ideasArray"]];

    [ideasArray addObject:dictionary];

    [[NSUserDefaults standardUserDefaults]setObject:ideasArray forKey:@"ideasArray"];

    [self dismissModalViewControllerAnimated:YES];
}


但是,此后,我的应用程序变慢,并且它缓慢地保存和加载图像。我做错了什么?

我真的不想使用Core Data,因为我已经将想法的所有其他属性保存在NSUserDefaults中(例如成本,名称,颜色等)。

最佳答案

NSUserDefaults中设置值后,只需编写以下行:

[[NSUserDefaults standardUserDefaults] synchronize];


希望这会有所帮助。

10-07 19:54
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