Question

我被困在这一段时间，因为它太奇怪了。我向用户提供图像选择器，并在选择时使用图像作为按钮背景。问题是它仅在第二次拾取图像后才起作用。不必是相同的图像。目前的图像选择器选择图片，没有。再次尝试相同或不同的图片，一切正常。代码如下，有没有人有任何建议？

-(void) changeProfileImage:(UIImage*) image {
    profilePhoto = image;

    [editPhotoButton setTitle:@"edit" forState:UIControlStateNormal];
    [editPhotoButton setBackgroundImage:profilePhoto forState:UIControlStateNormal];
    [editPhotoButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];    
}

(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *) imageInfo {
    UIImage* imageToUse;
    UIImage* editedTmpImage = [imageInfo objectForKey:@"UIImagePickerControllerEditedImage"];
    if (!editedTmpImage)
       imageToUse = [imageInfo objectForKey:@"UIImagePickerControllerOriginalImage"];
       imageToUse = [imageToUse resizedImageWithContentMode:UIViewContentModeScaleAspectFill bounds:CGSizeMake(MIN(imageToUse.size.width,1024), MIN(imageToUse.size.width, 768)) interpolationQuality:kCGInterpolationHigh];

   [self changeProfileImage:imageToUse];
   [imagePicker dismissViewControllerAnimated:YES completion:Nil];
}

Answer 1

首先，只是为了确保，你可以稍微清理它并再试一次吗？

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *) imageInfo {
    UIImage* imageToUse = [imageInfo objectForKey:@"UIImagePickerControllerEditedImage"];
    if (!imageToUse) { // this part was confusing above, please use curvy-braces
       imageToUse = [imageInfo objectForKey:@"UIImagePickerControllerOriginalImage"];
    }
    imageToUse = [imageToUse resizedImageWithContentMode:UIViewContentModeScaleAspectFill bounds:CGSizeMake(MIN(imageToUse.size.width,1024), MIN(imageToUse.size.width, 768)) interpolationQuality:kCGInterpolationHigh];

    [self changeProfileImage:imageToUse];
    [imagePicker dismissViewControllerAnimated:YES completion:nil];
}

Answer 2

This（Is it possible to refresh a single UITableViewCell in a UITableView?）解决了这个问题！按照链接中的建议重新绘制出售。

来自图像选择器的UIButton setBackground仅适用于第二次尝试

2 个答案: