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
在NSUserDefaults
中设置值后,只需编写以下行:
[[NSUserDefaults standardUserDefaults] synchronize];
希望这会有所帮助。