在Objective C中存储重新调整大小的图像

Question

我正在编写一个应用程序，它允许用户选择调整图像大小并将其上载到服务中。调整大小似乎工作正常，但它不会将重新创建的图像存储在适当的位置，因为应用程序似乎不认为已加载照片。

请注意，if语句中的第一个函数（关于“normal_size”）工作正常。我试图在附加尺寸参数中重新创建这两行，但我似乎无法弄清楚它为什么不存储它。这真让我抓狂。这里是代码：

// Set image dictionaries 
iInfoDict = [[NSDictionary alloc] initWithDictionary:info]; 
NSLog(@"infor ===== %@", info); 
UIImage* image =[info objectForKey:@"UIImagePickerControllerOriginalImage"]; 
NSLog(@"iImage name === %@", iImage); 

// Determines path of image taken/chosen 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"image.jpg"]; 

CGSize size; 

// Not sure what this does other than dismissing the pickerViewController 

NSData* data = UIImageJPEGRepresentation(image, 0.9); 
[data writeToFile:appFile options:nil error:nil]; 
NSLog(@"Documents ==== %@", documentsDirectory); 
[picker dismissModalViewControllerAnimated:YES]; 
// photo.image = [info objectForKey:@"UIImagePickerControllerOriginalImage"]; 

// IMAGE RESIZE CODE 

if ([[NSUserDefaults standardUserDefaults] boolForKey:@"normal_image"])  
{ 
    [photoData setObject:[iInfoDict objectForKey:@"UIImagePickerControllerOriginalImage"] forKey:@"image"]; 
    photo.image = [iInfoDict objectForKey:@"UIImagePickerControllerOriginalImage"]; 
} 
else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"small_image"]) 
{ 
    CGSize size = CGSizeMake (600, 450); 
    UIImage *origImage = [iInfoDict objectForKey:@"UIImagePickerControllerOriginalImage"]; 
    UIImage *destImage = [origImage resizedImage:size interpolationQuality:kCGInterpolationHigh]; 

    NSLog(@"Image Size: %@", NSStringFromCGSize(destImage.size)); 
    [photoData setObject:destImage forKey:@"image"]; 

    photo.image = destImage; 
} 

Answer 1

要么我不理解你的问题，要么你不明白你在做什么。我怀疑后者是基于评论// Not sure what this does other than dismissing the pickerViewController，后面紧接着两行，将未被复制的图像写入文档目录。

您可能想要在之前调整图像的大小，因此我建议您在调整大小后将文字移至最后。

删除两行：

NSData* data = UIImageJPEGRepresentation(image, 0.9); 
[data writeToFile:appFile options:nil error:nil]; 

，并在最后加上这两条线（没有保证，从内存中写入）：

NSData* data = UIImageJPEGRepresentation(photo.image, 0.9); 
[data writeToFile:appFile options:nil error:nil];