嘿,伙计们,我正在用UIImagePickerController做一些图像编辑。以下是imagePickerController:didFinishPickingMediaWithInfo
中的一些代码
UIImage *editedImg = [info objectForKey:UIImagePickerControllerEditedImage];
UIImageView *imgView = [[UIImageView alloc] initWithImage:editedImg];
CGRect imgFrm = imgView.frame;
float rate = imgFrm.size.height / imgFrm.size.width;
imgFrm.size.width = size;
imgFrm.size.height = size * rate;
imgFrm.origin.x = 0;
imgFrm.origin.y = (size - imgFrm.size.height) / 2;
[imgView setFrame:imgFrm];
UIView *cropView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, size, size)];
[cropView setBackgroundColor:[UIColor blackColor]];
[cropView addSubview:imgView];
UIImage *croppedImg = [MyUtil createUIImageFromUIView:cropView];
上面是在size*size视图中设置图像,并在picker返回的图像高度小于size时从视图中绘制图像。
下面是createUIImageFromUIView:(UIView*)view
的代码:
+ (UIImage *)createUIImageFromUIView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 2.0);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[view.layer renderInContext:ctx];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return viewImage;
}
我的问题是:在调试时,‘editedImg’(在第一行定义)只显示'nil‘。但是,下面的代码运行得很好。我正确地获得了corpView(也显示为'nil‘),得到了裁剪的图像,并可以将其编码为base64编码的字符串,以便发送到服务器端。我只想知道为什么editedImg是nil (由info objectForKey:UIImagePickerControllerEditedImage,返回,但当我选择在调试模式下打印信息时,控制台中的输出不是nil)?
发布于 2013-12-09 15:33:42
经过一番搜索,我意外地找到了这个:string value always shows nil in objective-c
这就是为什么我总是在调试模式下看到'nil‘,而代码运行良好的原因。
发布于 2013-12-09 14:54:56
editdImg结果为空,请尝试:
UIImage *editedImg = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
获取文件大小:
- (long long) fileSizeAtPath:(NSString*) filePath{
NSFileManager* manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:filePath]){
return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
}
return 0;
}
谨致问候!
发布于 2013-12-09 15:00:19
您可以通过以下方式获取裁剪后的图像大小
UIImage *croppedImg = [MyUtil createUIImageFromUIView:cropView];
NSData *dataForImage = UIImagePNGRepresentation(croppedImg);
现在你可以检查长度了
if (dataForImage.length)
{
}
https://stackoverflow.com/questions/20464415
复制相似问题