ios - imagePickerController设置UIImageView.image不改变图片显示

Question

我试图将 UIImageView 的图像设置为下面 UIImagePickerController 的返回值。我的UIImageView profileImageView是在viewdidload中实例化的。奇怪的是，UIImagePickerController返回的图片并没有在profileImageView中显示出来。一开始我以为是图片问题，所以我把它修复为SR-rewards.jpg。添加NSLog，显示[profileImageView setImage:[UIImage imageNamed:@"SR-rewards.jpg"]]已经执行，但是profileImageView.image.size.height为0。然后我使用 再拍一次
[profileImageView performSelectorOnMainThread:@selector(setImage:) withObject: [UIImage imageNamed:@"SR-rewards.jpg"] waitUntilDone:YES];在主线程中运行它。尽管如此，图像仍然没有显示，profileImageView.image.size.height 变为 277。

知道原因吗？我该如何设置图像？

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
    [profileImageView setImage:[UIImage imageNamed:@"SR-rewards.jpg"]];//[self cropImage:smallImage];
    NSLog(@"%f" , profileImageView.image.size.height);
    [picker dismissViewControllerAnimated:YES completion:NULL];

}

问候锤子

Answer 1

更新主队列中的 UI。

dispatch_async(dispatch_get_main_queue(), ^{
    [profileImageView setImage:[UIImage imageNamed:@"SR-rewards.jpg"]];
});