imagePickerController设置UIImageView.image不会更改显示的图像

Question

我想设置UIImageView的图像作为下面的UIImagePickerController返回。我的UIImageView profileImageView在viewdidload中实例化。奇怪的是，UIImagePickerController返回的图像并未显示在profileImageView中。起初我认为这是图像问题，所以我将它固定在SR-rewards.jpg上。添加NSLog，它显示[profileImageView setImage：[UIImage imageNamed：@“SR-rewards.jpg”]]已被执行，但profileImageView.image.size.height为0. 然后我再给它一次拍摄使用 [profileImageView performSelectorOnMainThread:@selector(setImage:) withObject: [UIImage imageNamed:@"SR-rewards.jpg"] waitUntilDone:YES]; 运行它在主线程中。虽然图像仍然不显示，但profileImageView.image.size.height更改为277.

任何想法的原因？我怎样才能设置图像？

- (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

Answer 1

更新UI主队列。

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