如何保存具有特定名稱的UIImagePicker圖像

Question

我使用UIPickerController從iPhone捕獲圖像，然後如何以編程方式將其保存爲特定名稱，並稍後（通過使用名稱）調用圖像，是否有任何可能性來更改圖像大小，例如。從100×100像素到50×50像素

感謝

Answer 1

下面的代碼段將所述圖像保存到文件中：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { 
    UIImage *anImage = [info valueForKey:UIImagePickerControllerOriginalImage]; 
    NSData *imageData = UIImageJPEGRepresentation(anImage, 1.0); 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *path = [paths objectAtIndex:0]; 
    NSString *tmpPathToFile = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%@/specificImagedName.jpg", path]]; 

    if([imageData writeToFile:tmpPathToFile atomically:YES]){ 
      //Write was successful. 
    } 
} 

然後從文件中調出圖像：

NSData *imageData = [NSData dataWithContentsOfFile:tmpPathToFile]; 
[UIImage imageWithData:imageData]; 

最後，this post有一個方法可用，您可以將它合併到項目中以調整圖像大小。