1

要理解我的问题，请通过以下方式：

  • 在我的应用程序中，用户首先点击一个按钮。
  • 显示图像选择器控制器
  • 用户从中选择图像/图像。
  • 所有这些图像都必须保存到我的 iPhone 应用程序中。

我已经实现了这一点，为此我实现了以下代码。

 -(IBAction)setPhoto:(id)sender {
    facPhotoPicker=[[UIImagePickerController alloc]init];
    facPhotoPicker.delegate=self;
    facPhotoPicker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
    facPhotoPicker.allowsImageEditing=YES;
    facPhotoPicker.navigationBar.barStyle=UIBarStyleBlackOpaque;
    [self presentModalViewController:facPhotoPicker animated:YES];
}

-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info {
    NSData *imgData=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"],1);
    UIImage *img=[[UIImage alloc] initWithData:imgData];
    facImgView.image=img;
    [img release];
    NSString *str=[NSString stringWithFormat:@"%i.jpg",[currentFaculty facultyNo]];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [NSString stringWithFormat:@"%@/%@", [paths objectAtIndex:0], str];
    [imgData writeToFile:path atomically:YES];
    [picker dismissModalViewControllerAnimated:YES];
}

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

但问题是用户的 iPhone 可能有更大的图像。

我不想在应用程序中存储大图像。例如

  • 用户选择大小为 1200 x 800 的图像

  • 但我只想要 80 x 80 尺寸的图像

    1. 选定的图像应缩小到我的要求 / 8 mb 图像小于 500 kb
    2. 如何将图像存储在资源目录中而不是存储在文档目录中？
4

3 回答 3

8

这解决了。

缩小规模的主要关键。我将图像缩小到 116 kb。

NSData *imgData=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"],compressionRatio);
while ([imgData length]>50000) { 
    compressionRatio=compressionRatio*0.5;
    imgData=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"],compressionRatio);
}

-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
double compressionRatio=1;
NSData *imgData=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"],compressionRatio);
while ([imgData length]>50000) { 
    compressionRatio=compressionRatio*0.5;
    imgData=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"],compressionRatio);
}
UIImage *img=[[UIImage alloc] initWithData:imgData];
facImgView.image=img;
NSLog(@"%@",[info objectForKey:@"UIImagePickerControllerOriginalImage"],3);
[img release];


NSString *str=[NSString stringWithFormat:@"%i.jpg",[currentFaculty facultyNo]];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [NSString stringWithFormat:@"%@", [paths objectAtIndex:0]];
path=[path stringByDeletingLastPathComponent];
path=[NSString stringWithFormat:@"%@/%@",path,str];
[imgData writeToFile:path atomically:YES];
[picker dismissModalViewControllerAnimated:YES];
}
于 2009-09-18T19:50:48.677 回答
2

2）您现在不能将资源目录存储在应用程序内的任何目录中。

于 2009-09-18T17:41:19.763 回答
0
  1. 通过执行以下逻辑，任何人都可以存储在资源目录/文档目录的上一级目录中。
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
NSData *imgData=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"],1);
UIImage *img=[[UIImage alloc] initWithData:imgData];
facImgView.image=img;
NSLog(@"%@",[info objectForKey:@"UIImagePickerControllerOriginalImage"],3);
[img release];
NSString *str=[NSString stringWithFormat:@"%i.jpg",[currentFaculty facultyNo]];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [NSString stringWithFormat:@"%@", [paths objectAtIndex:0]];
path=[path stringByDeletingLastPathComponent];
path=[NSString stringWithFormat:@"%@/%@",path,str]; // storing path
[imgData writeToFile:path atomically:YES]; // stores successfully 
[picker dismissModalViewControllerAnimated:YES];
}
于 2009-09-18T18:01:34.967 回答